Search

Context: Decreased muscle strength and balance in patients with functional ankle instability (FAI) can be effectively improved by ankle strength training. Low-load blood flow restriction (LL-BFR) training increases muscle size and strength, but there is limited evidence from studies on muscle strength and balance in FAI patients. Objective: To study the effects of LL-BFR training versus high-load training (HLT) on muscle strength and balance in FAI patients. Design: Randomized controlled trial. Participants: Forty-six young adults with a history of FAI. Interventions: Participants in the LL-BFR and HLT groups performed 4 sets (30 x 15 x 15 x 15) of ankle training at 20% to 40% of the one-repetition maximum and 70% to 85% one-repetition maximum, respectively, twice a week for 6 weeks. Main Outcome Measure(s): Plantar flexion, dorsiflexion, inversion, and eversion muscle strength, and the Y-balance test scores were assessed at baseline and after 3 and 6 weeks; the thickness of the tibialis anterior, triceps surae, and peroneus longus muscles were assessed at baseline and after 6 weeks. Results: Inversion, eversion, dorsiflexion, and plantar flexion muscle strength; tibialis anterior, triceps surae, and peroneus longus thickness; and Y-balance test scores were significantly increased in the LL-BFR group after 3 and 6 weeks compared with baseline (P < .05), with no significant difference between the LL-BFR and HLT groups after 6 weeks (P > .05). However, at the end of 3 weeks, eversion muscle strength and Y-balance test scores were significantly higher in the LL-BFR group than in the HLT group (P < .05). Conclusions: Over 6 weeks, LL-BFR training was as effective as HLT in improving ankle muscle strength, muscle thickness, and balance in FAI patients, but LL-BFR training improved the ankle eversion muscle strength and dynamic balance more than HLT did in the early stages of the intervention. This finding will provide a new intervention strategy for the clinical rehabilitation of FAI patients. [ABSTRACT FROM AUTHOR]

Clinical Scenario: The high recurrence of lateral ankle sprains progresses to chronic ankle instability (CAI) and can affect many athletes in all sports. CAI is often associated with a decrease in muscle strength, an increase in pain, a decrease in the range of motion, and a decrease in balance or neuromuscular control. The use of blood flow restriction (BFR) with CAI can increase muscular outcomes and be used as a rehabilitation tool. Clinical Question: Is there evidence to suggest that BFR improves strength, muscle activation, and/or cross-sectional area of the lower leg musculature in those with CAI? Clinical Bottom Line: There is moderate evidence to support therapeutic exercise with low-intensity BFR in patients with CAI. The evidence concluded a significant improvement in BFR to increase muscle activation of the fibularis longus, anterior tibialis, vastus lateralis, and soleus. There is moderate evidence suggesting BFR can induce strength gains in the muscles of the lower extremity in patients with CAI. Strength of Recommendation: The comprehensive evidence is a Strength of Recommendation Taxonomy (SORT) Grade B, with a level of evidence of 2, according to the Centre for Evidence-Based Medicine (CEBM) for the studies included. [ABSTRACT FROM AUTHOR]

The peroneus longus graft has gained much attention in recent years as a reliable autograft for primary ACL surgery. Critics have voiced concerns related to its impact on ankle biomechanics. The current review aims to synthesize the available literature on ankle biomechanics after peroneus harvest. The quantum of evidence available shows that PL harvest does not significantly impact ankle eversion or plantarflexion strength. Its impact on gait needs to be studied more deeply before any significant conclusions can be drawn. [ABSTRACT FROM AUTHOR]

Background: Peroneus longus (PL) graft harvest has gained popularity in recent years for a variety of ligament surgeries. One of the common apprehensions regarding its more widespread usage has been the risk of injury to the common peroneal nerve or the sural nerve during graft harvest. The purpose of the current study is to assess the rate of injury to the peroneal and sural nerve following PL harvest using our technique in a large cohort of patients. Materials and Methods: A prospective cohort of 600 consecutive patients undergoing PLG harvest over a period from January 2022 to December 2022 at a single tertiary referral centre were included for analysis. Patients had baseline screening of nerve function prior to surgery and were regularly followed up at 3 weeks, 6 weeks, 3 months and 6 months post-harvest. Grouped variables for the sural and peroneal nerve were completed and analysis was carried out using Cochrane's Q test and McNemar's test. Results: We found that only 0.01% of patients had any nerve complications at 6 months follow-up, and three times more patients had sural nerve complaints than peroneal nerve complaints at the end of the 6 months follow-up. Conclusion: Peroneus longus harvest is a safe and reproducible technique with low complication rate. The rate of nerve complications post-harvest is grossly overestimated in the literature secondary to low-powered and low evidence studies. We believe that using our safe surgical technique for PL harvest with respect to surface landmarks allows for PL harvest with a low nerve complication rate. [ABSTRACT FROM AUTHOR]

Introduction: Peroneus longus has proved to be a promising graft for ACL reconstruction due to its high tensile strength, and ease of harvesting. While multiple studies have assessed the functional outcomes of the knee after ACL reconstruction using peroneus longus autograft, we aimed to evaluated donor site morbidity among the Indian population. Matreials and methods: This was a prospective, longitudinal, descriptive study conducted at a tertiary care hospital. Preoperative AOFAS and Karlsson-Peterson scores were obtained, and patients were followed up after surgery for a period of 6-months using the same scoring systems and strength testing with a hand-held Chatillon MSE-100-M dynamometer. Pedobarographs were done using Diers Pedoscan Plantar Pressure Measurement System on a subset of seven patients. Results: 20 patients participated in the study. Mean AOFAS and Karlsson-Peterson scores pre-operatively were 99.7 ± 1.34 and 98.5 ± 4.62 respectively. On completing 6- months of follow-up these scores were found to be 95.6 ± 9.43 and 88.75 ± 18.42 respectively. Deterioration of mean evertor strength was noted at all follow-ups compared to the opposite side. Static pedobarographs showed significant decreased in total surface area of contact and pressure over the posterior aspect of the operated side by 3-months which improved later at 6-months. Dynamic pedobarographs showed decreased mean average plantar pressure while walking on the operated side and significant increase in mean surface area of contact of the operated side (191.886±22.678 cm2) at 6-months of follow-up compared to the opposite side (184.471 ± 22.218 cm2). Five patients showed deviation of the point of maximum pressure while walking on the operated foot making it lateral to the COP with increased lateral plantar/ medial plantar pressure ratio. Conclusion: While the use of peroneus longus tendon autografts in arthroscopic ACL reconstruction does not seem problematic on short-term subjective assessment, there is objective evidence in keeping with evertor weakness, weakness of first ray plantar flexion and possible ankle instability. Level of Evidence: Level lll. [ABSTRACT FROM AUTHOR]

Background: Recently the peroneus longus tendon (PLT) gained popularity in anterior cruciate ligament (ACL) reconstruction and has been utilized with satisfactory outcomes. However, there are concerns regarding donor site morbidity. This study aims to compare the functional outcome of ACL reconstruction using hamstring (HT) and PLT autografts and evaluate the donor site morbidity. Methods: Patients who underwent ACL reconstruction were allocated to two groups (HT and PLT). Graft diameter was measured intraoperatively. Knee functional outcome was evaluated with IKDC and Tegner-Lysholm scores preoperatively, and postoperatively after 3 months, 6 months, and 1 year. Donor site morbidities were assessed with thigh circumference measurements, subjective evaluation of sensory disturbances, and ankle scoring with AOFAS and FADI scores. Results: At 1-year follow-up, the PLT group showed comparable IKDC (p = 0.925) and Tegner-Lysholm (p = 0.600) scores with those of the HT group. The mean graft diameter in the PLT group (7.93 ± 0.52 mm) was larger compared with the HT group (7.43 ± 0.50 mm) (p < 0.001). The incidence of thigh atrophy (HT-16.7%, PLT-10%) and sensory disturbances (HT-73.3%, PLT-10%) was greater in the HT group. There was no significant ankle donor site morbidity in the PLT group (AOFAS-98.67 ± 3.45, FADI-99.23 ± 1.69). Conclusion: ACL reconstruction with PLT had comparable functional outcome with that of HT at 1 year. However, PLT demonstrated larger graft diameter, less donor site morbidity, and enhanced muscle recovery without significantly affecting the ankle function. PLT can be safely used as an acceptable alternative graft choice harvested from outside the knee for ACL reconstruction. [ABSTRACT FROM AUTHOR]

Hypermobility of the first tarsometatarsal joint plays an important role in hallux valgus pathogenesis. The peroneus longus is recognized as a dynamic stabilizer of the first tarsometatarsal joint. However, the association between the peroneus longus function and the hallux valgus deformity remains unknown. This study aimed to determine the effect of peroneus longus contraction induced by electrical muscle stimulation on the correction of hallux valgus radiographic parameters in patients with hallux valgus. Thirty-five patients with hallux valgus (47 feet; 2 men, 33 women; mean age 64.9 years) were included. Non-weight-bearing dorsoplantar radiographs of the foot were obtained with and without electrical muscle stimulation of the peroneus longus. Radiographic parameters of hallux valgus deformities, including the hallux valgus angle, intermetatarsal angle, first metatarsal protrusion distance, and distance between the first and second metatarsal bases, were measured and compared between the two conditions. All hallux valgus radiographic parameters were significantly improved by contraction of the peroneus longus. The median hallux valgus angle decreased by 13.2°. Fewer changes in the hallux valgus angle were identified in patients with severe deformity and geriatric patients. Although the peroneus longus muscle has received little attention in the management of hallux valgus, our findings suggest that it has the potential to be a novel conservative approach for treating mild-to-moderate hallux valgus. [ABSTRACT FROM AUTHOR]

Background: The peroneus longus (PL) and peroneus brevis (PB) function as the primary muscles of eversion, a movement closely associated with tibial external rotation for ankle mor-tise stability. Ankle motion and tibial rotation vary based on different ankle and knee positions. Objects: This study aimed to investigate the PL, PB, and biceps femoris (BF) muscle activation and eversion strength during side-lying isometric eversion exercise based on different ankle positions (neutral [N] and plantarflexion [PF]) and knee positions (90° flexion [KF] and exten-sion [KE]). Methods: Thirty healthy adults with an Ankle Joint Functional Assessment Tool score of ≥ 22 were recruited (mean age = 24.8 ± 3.1 years). Maximal isometric eversion strength and submaximal muscle activation of the PL, PB and BF were measured during isometric eversion exercise in side-lying. A 2 × 2 repeated measures analysis of variance was performed to inves-tigate differences in muscle activation and strength. Results: The PL and PB muscle activation showed significant main effects with the knee and ankle positions (p < 0.05); activation was greater in the KE and PF positions than in the KF and N positions. The BF muscle activation showed a significant interaction effect with knee and ankle positions, which was greater in knee extension and ankle plantarflexed (KEPF) posi-tion than in knee flexion and ankle plantarflexed (KFPF) position (p < 0.05). Eversion strength showed a significant main effect only in ankle position (p < 0.05) and was greater in the N position than in the PF position. Conclusion: The results of this study indicate that the KEPF position can be recommended to facilitate contraction of the PL and PB during side-lying eversion exercise. Furthermore, the effects of the knee-ankle positions should be considered for measuring ankle eversion strength and implementing the isometric submaximal side-lying eversion exercise.

Importance: Neuromodulation may be one of the underlying mechanisms of dry needling (DN); however, the mechanism has not yet been fully clarified. Objective: This randomized controlled trial is designed to evaluate DN stimulation of the tibialis anterior and peroneus longus muscles in chronic ankle instability (CAI) and healthy subjects, employing functional magnetic resonance imaging (fMRI). Design: Clinical study protocol, SPIRIT compliant. Setting: Brain Mapping Laboratory. Population: A total of thirty participants aged between 18 and 40 years old will be included in this study. Twenty healthy participants will be randomized into 2 groups (real DN and sham DN). Ten patients with CAI will also be recruited to the third group and receive only real DN for comparison. Exposures: Real and sham DN. Main Outcomes and Measures: The voxel count, coordinates of peak activation, and peak intensity will be obtained as primary outcomes to report brain map activation. Measurements will be taken before, during, and after DN treatment. The strength of the ankle dorsiflexors, active dorsiflexion range of motion, and McGill pain questionnaire short-form will be used as secondary outcome measures. Results: The results from this study will be published in peer-reviewed journals and disseminated as presentations at national and international congresses. Conclusion: This trial will explore brain responses to real and sham DN in healthy participants and to real DN in CAI patients. Overall, our results will provide preliminary evidence of the neural mechanism of DN. [ABSTRACT FROM AUTHOR]

Background: Although operative treatment of the flexible progressive collapsing foot deformity (PCFD) remains controversial, correction of residual forefoot varus and stabilization of the medial column are important components of reconstruction. A peroneus brevis (PB) to peroneus longus (PL) tendon transfer has been proposed to address these deformities. The aim of our study was to determine the effect of an isolated PB-to-PL transfer on medial column kinematics and plantar pressures in a simulated PCFD (sPCFD) cadaveric model. Methods: The stance phase of level walking was simulated in 10 midtibia cadaveric specimens using a validated 6–degree of freedom robot. Bone motions and plantar pressure were collected in 3 conditions: intact, sPCFD, and after PB-to-PL transfer. The PB-to-PL transfer was performed by transecting the PB and advancing the proximal stump 1 cm into the PL. Outcome measures included the change in joint rotation of the talonavicular, first naviculocuneiform, and first tarsometatarsal joints between conditions. Plantar pressure outcome measures included the maximum force, peak pressure under the first metatarsal, and the lateral-to-medial forefoot average pressure ratio. Results: Compared to the sPCFD condition, the PB-to-PL transfer resulted in significant increases in talonavicular plantarflexion and adduction of 68% and 72%, respectively, during simulated late stance phase. Talonavicular eversion also decreased in simulated late stance by 53%. Relative to the sPCFD condition, the PB-to-PL transfer also resulted in a 17% increase (P =.045) in maximum force and a 45-kPa increase (P =.038) in peak pressure under the first metatarsal, along with a medial shift in forefoot pressure. Conclusion: The results from this cadaver-based simulation suggest that the addition of a PB-to-PL transfer as part of the surgical management of the flexible PCFD may aid in correction of deformity and increase the plantarflexion force under the first metatarsal. Clinical Relevance: This study provides biomechanical evidence to support the addition of a PB-to-PL tendon transfer in the surgical treatment of flexible PCFD. [ABSTRACT FROM AUTHOR]

Purpose: The aim of this study was to describe the incidence and a complex pathoanatomy of posterior malleolus fractures in a Maisonneuve fracture. Methods: The study included 100 prospectively collected patients with a complete clinical and radiological documentation of an ankle fracture or fracture-dislocation including a fracture of the proximal quarter of the fibula. Results: A posterior malleolus fracture was identified in 74 patients, and in 27% of these cases it carried more than one quarter of the fibular notch. Displacement of the posterior fragment by more than 2 mm was shown by scans in 72% of cases. Small intercalary fragments were identified in 43% of cases. Fractures of the Tillaux–Chaput tubercle were identified in 20 patients. Conclusion: Our study has proved a high rate of posterior malleolus fractures associated with a Maisonneuve fracture, and documented their considerable variability in terms of involvement of the fibular notch, tibiotalar contact area, direction of displacement and frequency of intercalary fragments. Of no less importance is a combination of Tillaux–Chaput fractures with a Maisonneuve fracture. [ABSTRACT FROM AUTHOR]

Ankle destabilizing devices were developed to improve the recruitment of the evertor muscles. Nevertheless, the activity of lower-leg muscles has never been compared to each other during functional tests performed with destabilization. The objectives were i) to compare the electromyographic activity between the lower-leg muscles during four functional tests performed with ankle destabilization, and ii) to determine sex-related differences in neuromuscular activation. Twenty-six healthy volunteers (13 males, 13 females) performed the modified Star Excursion Balance Test (mSEBT), unipedal balance and weight-bearing inversion and eversion tests with a destabilizing device, while recording electromyographic activity of the peroneus longus and brevis, tibialis anterior, gastrocnemius lateralis and gluteus medius. The activity of peroneal muscles was significantly greater than other muscles during all functional tests. Furthermore, the anterior direction of the mSEBT was the one implying the greatest activity of the peroneus longus muscle compared to the posteromedial (p=0.003) or posterolateral (p<0.001) directions. Finally, no significant sex-related differences in neuromuscular activity were reported. This study highlights the effectiveness of the destabilizing device to involve specifically the peroneal muscles when performing various functional tests. This device should be used by clinicians to be more specific to the stabilizers of the ankle joint during functional exercises. [ABSTRACT FROM AUTHOR]

Background: The complex framework of the human foot enables movement and weight support. The os peroneum (OP) is a sesamoid bone located in the tendon of peroneus longus. Though tiny, it plays crucial roles in foot movement and arch stability injuries to the tendon are significant, and the OP itself can fracture, dislocate, or impinge. Its presence, size, and even histological type influence the proper functioning of the foot. Studying this sesamoid bone, with its variable prevalence and morphology, can fill gaps in foot and ankle pathology research. Aims and Objectives: To analyze the prevalence, morphology, morphometry, and histology of OP in human adult cadavers in the South Indian population. Materials and Methods: Forty-two formalin-fixed human adult cadaveric free lower limbs were selected and studied from the Department of Anatomy, Pushpagiri Institute of Medical Sciences and Research Centre, Tiruvalla, Kerala. The prevalence of OP in peroneus longus tendons (PLT) and its various configurations were carefully observed, along with their histological types, and then statistical analysis of the data was done using SPSS version 20. Results: Thirty-nine out of the forty-two free lower limbs showed the presence of an OP bearing a smooth oval facet, except for one OP with a round facet. All OP were invariably present in the tunnel for PLT on the plantar surface of the cuboid bone. Three different histological types of this tissue were observed, i.e., osseous, cartilaginous, and fibrous. Conclusion: The present study has attempted to fill the gap in the research data regarding OP in the adult South Indian population. In addition, the knowledge of OP and its configuration in PLT could provide a better radiological and clinical approach to mid- and fore-foot pathologies.

Medial patellar instability (lateral patellofemoral ligament tear) is a rare condition which is commonly associated with lateral release for lateral patellar instability. LPFL is a lateral stabilizer of the patellofemoral joint. Reconstruction of LPFL is necessary to provide stability to the patella-femoral joint in patients with instability. We describe a novel technique of trans-osseous reconstruction of LPFL to gain stability and have better graft incorporation. A doubled peroneus longus graft is inserted into the patellar tunnel and secured with an endo button on the anteromedial aspect of the patella; the other end is then inserted into the insertional point on the femur and secured with an interference screw. This is an easy, novel, and reproducible technique which can be used to reconstruct LPFL. [ABSTRACT FROM AUTHOR]

Background: The complex framework of the human foot enables movement and weight support. The os peroneum (OP) is a sesamoid bone located in the tendon of peroneus longus. Though tiny, it plays crucial roles in foot movement and arch stability injuries to the tendon are significant, and the OP itself can fracture, dislocate, or impinge. Its presence, size, and even histological type influence the proper functioning of the foot. Studying this sesamoid bone, with its variable prevalence and morphology, can fill gaps in foot and ankle pathology research. Aims and Objectives: To analyze the prevalence, morphology, morphometry, and histology of OP in human adult cadavers in the South Indian population. Materials and Methods: Forty-two formalin-fixed human adult cadaveric free lower limbs were selected and studied from the Department of Anatomy, Pushpagiri Institute of Medical Sciences and Research Centre, Tiruvalla, Kerala. The prevalence of OP in peroneus longus tendons (PLT) and its various configurations were carefully observed, along with their histological types, and then statistical analysis of the data was done using SPSS version 20. Results: Thirty-nine out of the forty-two free lower limbs showed the presence of an OP bearing a smooth oval facet, except for one OP with a round facet. All OP were invariably present in the tunnel for PLT on the plantar surface of the cuboid bone. Three different histological types of this tissue were observed, i.e., osseous, cartilaginous, and fibrous. Conclusion: The present study has attempted to fill the gap in the research data regarding OP in the adult South Indian population. In addition, the knowledge of OP and its configuration in PLT could provide a better radiological and clinical approach to mid- and fore-foot pathologies. [ABSTRACT FROM AUTHOR]

Chronic ankle instability (CAI) is a common injury that can occur in daily life or sporting events. Injuries to the anterior talofibular, posterior talofibular, and calcaneofibular ligaments are common, and the core of rehabilitation training involves strengthening the peroneus muscle. Many studies on rehabilitation training have focused on strengthening the peroneus brevis muscle, and few studies have focused on specific training to strengthen the peroneus longus muscle. Therefore, this study aims to investigate changes in the symptoms and functions of patients by applying training to strengthen the peroneus longus and peroneus brevis muscles. Home-based training and mobile monitoring were utilized for 12 weeks, divided into peroneus brevis training (PBT) and peroneus longus training (PLT), in 52 adult males with CAI. Participation was voluntary, with enrollment done through a bulletin board, and intervention training allocation was randomly assigned and conducted in a double-blind manner. This study was registered as a trial protocol (KCT 0008478). Foot and ankle outcome scores (FAOS), isokinetic ankle strength tests, and Y-balance tests were performed before and after the intervention. Both PLT and PBT significantly improved in FAOS, inversion, and eversion at angular velocities of 30°/s and 120°/s and in the anterior and posterolateral directions of the Y-balance test (p < 0.05). Interaction effects by time and group were not significant for the FAOS (p > 0.05). However, PLT improved eversion muscle strength and muscle power to a greater degree, compared with PBT, in the anterior and posterolateral directions of the Y-balance test (p < 0.05). In conclusion, both PLT and PBT were effective for CAI patients; in addition, PLT had greater potential for improving strength and balance. [ABSTRACT FROM AUTHOR]

Background: The fibularis longus (FL) muscle is larger in volume than fibularis brevis (FB) and is therefore claimed to be the stronger evertor of the two. Clinical observation of FL and FB tendon rupture show that injury to the FB has a serious negative effect on hindfoot eversion. This implies that the FB is the stronger and more important evertor. The strength of a muscle is not purely based on its volume, and the observed discrepancy between the FB and FL may be due to differences in muscle architecture. This study compares the muscle architecture of FL with FB. Methods: Sixteen legs from eight formaldehyde-fixed human specimens, mean age 83 (range 72–89) years, were dissected. The volume, fibre lengths and fibre pennation angles for both muscles were measured and the physiological cross-sectional area (PCSA) was calculated. Results: The FL was always larger than the FB, with an individual difference in volume that varied from 1.4 to 4.6 times larger with a mean difference of 17 ml (95% CI 14–20; p < 0.001). Mean fibre lengths were 9 mm (95% CI 2–16; p = 0.015) longer in FL than in FB. The mean pennation angle was 9.6 degrees in FL and 8.8 degrees in FB, this difference was not significant (p = 0.32). The mean PCSA for FL was 3 cm2 (95% CI 2–4) larger than for FB (p < 0.001). Conclusions: With our sample set, the hypothesis that the muscle architecture can explain the clinical discrepancy between the FL and FB, was not supported. The difference in hindfoot eversion might instead depend on the different moment arms of FL and FB and the effect forefoot abduction has on hindfoot eversion. [ABSTRACT FROM AUTHOR]

Sporting foot and ankle injuries in older athletes are scarcely documented, however, they can play a key role in ending one's professional career. The term 'older athlete' itself comprises a large amount of age groups depending on various factors, mainly depending on the type of sport. Ankle inversion/injuries sprains are by far the most common with the anterior talofibular ligament being most frequent to tear about 75%, these injuries can range from a simple sprain, to more serious conditions which require accurate diagnosis and early treatment to ensure a full and expedient return to sports. Syndesmosis injury count for 1–18% of injuries following an ankle sprain. Deltoid ligament tear in combination with lateral ligament complex may need acute surgery; peroneal tendon injury and retinaculum tear are found mainly to affect the peroneus longus tendon in this group. Overuse chronic pathologies and arthritis are the leading cause of damage in this athlete group. The orthopaedic surgeon needs to be aware of the more subtle presentations of significant injuries and use appropriate imaging to make the diagnosis and treat the athlete appropriately to enable them in maintaining a professional/semi-professional career as long as possible, this review explores this topic into detail. [ABSTRACT FROM AUTHOR]

Background and objectives: In anterior cruciate ligament reconstruction, the strength of the graft was found to be unsatisfactory usually the anterior half of the peroneus longus tendon was taken for supplementation, but the effect on foot and ankle function and gait in the donor area is unclear. This study aims to explore the changes in the ankle and gait after using the harvested anterior half of the peroneus longus tendon as a reconstruction graft for the anterior cruciate ligament. Methods: A total of 20 patients, 6 males and 14 females, aged 18 to 44 years, with unilateral anterior cruciate ligament injuries, underwent reconstruction using the harvested anterior half of the peroneus longus tendon as a graft between June 2021 and December 2021. The part on which the anterior half of the peroneus longus tendon was harvested was considered the experimental group, while the contralateral foot was the control group. At the 6-month follow-up, the Lysholm knee score, AOFAS ankle score, and gait-related data (foot length, arch index, arch volume, arch volume index, and gait cycle parameters: percentage of time in each gait phase, step frequency, step length, foot strike angle, and push-off angle) were assessed using a 3D foot scanner and wearable sensors for both groups. Results: All 20 patients completed the six-month follow-up. There were no statistically significant differences between the experimental and control groups regarding knee scores, ankle scores, foot length, arch index, arch volume, arch volume index, step frequency, and step length (P > 0.05). However, there were statistically significant differences between the experimental and control groups in terms of the gait cycle parameters, including the percentage of time in the stance, mid-stance, and push-off phases, as well as foot strike angle and push-off angle (P < 0.05). Conclusion: Through our study of the surgical experimental group we have shown that harvesting the anterior half of the peroneus longus tendon does not affect foot morphology and gait parameters; however, it does impact the gait cycle. [ABSTRACT FROM AUTHOR]

To identify, critically appraise, and synthesize the existing evidence regarding the effects of therapeutic interventions on arthrogenic muscle inhibition (AMI) in patients with chronic ankle instability (CAI). Two reviewers independently performed exhaustive database searches in Web of Science, PubMed, Medline, CINAHL, and SPORTDiscus. Nine studies were finally included. Five types of disinhibitory interventions were identified: focal ankle joint cooling (FAJC), manual therapy, fibular reposition taping (FRT), whole-body vibration (WBV), and transcranial direct current stimulation (tDCS). There were moderate effects of FAJC on spinal excitability in ankle muscles (g = 0.55, 95% CI = 0.03–1.08, p = 0.040 for the soleus and g = 0.54, 95% CI = 0.01–1.07, p = 0.046 for the fibularis longus). In contrast, manual therapy, FRT, WBV were not effective. Finally, 4 weeks of tDCS combined with eccentric exercise showed large effects on corticospinal excitability in 2 weeks after the intervention (g = 0.99, 95% CI = 0.14–1.85 for the fibularis longus and g = 1.02, 95% CI = 0.16–1.87 for the tibialis anterior). FAJC and tDCS may be effective in counteracting AMI. However, the current evidence of mainly short-term studies to support the use of disinhibitory interventions is too limited to draw definitive conclusions. Therapeutic interventions on arthrogenic muscle inhibition (AMI) in patients with chronic ankle instability are scarce. Current studies incorporate mainly short-term therapeutic interventions. Focal ankle joint cooling seems effective to treat AMI. Several weeks of transcranial direct current stimulation may also be effective to counteract arthrogenic muscle inhibition but more studies are needed. [ABSTRACT FROM AUTHOR]

Purpose: This systematic review and meta-analysis aimed to investigate the correlation between anthropometric measurements and graft size in anterior cruciate ligament (ACL) reconstruction. Methods: A systematic search of Ovid MEDLINE, Embase, and Cochrane Library databases was conducted for observational studies published until March 2023 that reported the relationship between anthropometric data [height, weight, body mass index (BMI), age, gender, thigh length, and circumference] and ACL graft size. Correlation coefficients (COR) and their associated 95% confidence intervals were used as the primary effect size. This review was conducted in line with PRISMA guidelines. Results: A total of 42 observational studies involving 7110 patients were included, with a mean age of 29.8 years. Statistically significant, moderately positive correlations were found between graft size and height (COR: 0.49; 95% CI: 0.41–0.57; p-value: < 0.001), weight (COR: 0.38; 95% CI: 0.31–0.44; p-value: < 0.001), thigh circumference (COR: 0.40; 95% CI: 0.19–0.58; p-value: < 0.001), and thigh length (COR: 0.35; 95% CI: 0.18–0.50; p-value: < 0.001). However, age and gender were insignificantly correlated with graft size (p-value: NS). A subanalysis based on graft type showed a significant positive correlation between height and graft diameter, which was more significant in the peroneus tendon than in hamstring grafts (COR: 0.76 vs. 0.45; p-value: 0.020). Conclusion: This study demonstrated a moderate positive correlation between anthropometric measurements (height, weight, thigh circumference, and length) and ACL graft size, along with a weak positive correlation with BMI. Age and gender showed no significant correlation. These findings support the predictability and selection of ACL graft size based on pre-operative patient anthropometric data. Level of evidence: Level of Evidence: IV. PROSPERO registration number: CRD42023416044. [ABSTRACT FROM AUTHOR]

Individuals with chronic ankle instability (CAI) present muscular weakness and potential changes in the activation of the peroneus longus muscle, which likely explains the high recurrence of ankle sprains in this population. However, there is conflicting evidence regarding the role of the peroneus longus activity in CAI, possibly due to the limited spatial resolution of the surface electromyography (sEMG) methods (i.e., bipolar sEMG). Recent studies employing high‐density sEMG (HD‐sEMG) have shown that the peroneus longus presents differences in regional activation, however, it is unknown whether this regional activation is maintained under pathological conditions such as CAI. This study aimed to compare the myoelectric activity, using HD‐sEMG, of each peroneus longus compartment (anterior and posterior) between individuals with and without CAI. Eighteen healthy individuals (No‐CAI group) and 18 individuals with CAI were recruited. In both groups, the center of mass (COM) and the sEMG amplitude at each compartment were recorded during ankle eversion at different force levels. For the posterior compartment, the sEMG amplitude of CAI group was significantly lower than the No‐CAI group (mean difference = 5.6% RMS; 95% CI = 3.4–7.6; p = 0.0001). In addition, it was observed a significant main effect for group (F1,32 = 9.608; p = 0.0040) with an anterior displacement of COM for the CAI group. These findings suggest that CAI alters the regional distribution of muscle activity of the peroneus longus during ankle eversion. In practice, altered regional activation may impact strengthening programs, prevention, and rehabilitation of CAI. [ABSTRACT FROM AUTHOR]

Purpose: This study aimed to explore whether the correction on the retinaculum of the ankle with facilitation on the peroneal muscle or the facilitation technique on the peroneal muscle had an immediate effect on static balance in healthy subjects. Material and Methods: Sixty healthy individuals were investigated. Individuals were randomly separated into 3 groups. KT was applied using the facilitation technique on the peroneal muscle, or the facilitation technique on the peroneal muscle, and the correction technique on the retinaculum of the ankle. No KT was applied to the control group. The standing stork test was used to evaluate static balance with opened and closed eyes. Results: There was no difference in static balance between the groups with opened and closed eyes before and after KT application (p>0.05). There was no difference in static balance before and after KT application with opened and closed eyes in the KT-2 group (p>0.05). However, there was a significant difference in static balance before and after KT application in the KT-1 group with closed eyes (p<0.05). Conclusion: Applying the facilitation technique on peroneal muscles improved static balance when eyes were closed. No effect was observed when the correction and facilitation techniques were used together on the ankle. Many KT techniques on the ankle are not required to improve static balance; they can even affect static balance negatively. [ABSTRACT FROM AUTHOR]

Importance: Recently, peroneus longus (PL) autograft as a graft choice for ligament surgeries have attracted interest due to studies showing good clinical outcomes and minimal donor site morbidity. There remain concerns related to these grafts, especially the potential impact on ankle functions. Aims/Objective: The purpose of this review and meta-analysis is to summarize the available evidence for ankle functional outcomes after PL harvest. This will provide objective clinical evidence for surgical decision making. Evidence Review: Cochrane, Embase, Medline, and Google Scholar were all searched for articles published between January 2001 and May 2021. For the aim of a systematic review, certain inclusion and exclusion criteria were adopted in accordance with PRISMA recommendations. The primary outcome measure was the assessment of ankle functional outcomes using validated instruments (such as AOFAS score, FADI score etc.) Findings: A total of twelve studies representing pooled patient populations of 537 patients were included in this review. The average follow-up duration was 17 months (range; 6–32 months) across all studies. All twelve studies assessed AOFAS score and six studies also additionally assessed FADI score. The pooled mean outcomes measured showed a slight decrease in post-operative as compared to pre-operative AOFAS and FADI score (mean difference of AOFAS 1.92, 95% CI 1.021–3.123, p value < 0.05 and mean difference for FADI 1.50, 95% CI 0.561–2.445, p value < 0.05). Though statistically significant the magnitude of variance implies minimal clinical impact. Conclusion and Relevance: This review and meta-analysis found that PL autograft harvest leads to statistically significant but minimal impact on ankle functional outcomes. This, in conjunction with various studies on ankle parameters after PL harvest, shows that PL harvest leads to minimal impact on ankle outcomes and function. Level of Evidence: Systematic review Level III. [ABSTRACT FROM AUTHOR]

Abnormal foot motion is considered to be related to sports related injuries. This study aimed to identify the relationship between calf muscle activity and inter-segment coordination of the foot during single-leg drop jumps. Eleven healthy men participated and performed single-leg drop jumps from a 30-cm box. Muscle activity of the tibialis posterior (TP), flexor digitorum longus, peroneus longus (PL) and gastrocnemius were measured. The rearfoot and midfoot segment angle from landing to leaping were calculated according to the Rizzoli Foot Model and time scaled to 100%. A modified vector coding technique was employed to classify inter-segment coordination of every 1% into four patterns (in-phase, anti-phase, rearfoot phase,and midfoot phase). The relationship between percentage of each pattern and muscle activity levels were statistically analysed with correlation coefficient. The TP showed a significant positive correlation with percentage of in-phase in coronal plane (r = 0.61, p = 0.045). The PL also showed a trend of positive correlation to in-phase in coronal plane (r = 0.59, p = 0.058). TP and PL muscle activities may modulate the inter-segment coordination between the rearfoot and midfoot in coronal plane. Clinically, these muscles should be assessed for abnormal inter-segment foot motion. [ABSTRACT FROM AUTHOR]

Acute Achilles tendon rupture is a common injury and when missed leads to the development of a chronic Achilles tendon rupture. Studies suggest surgical treatment (either repair or reconstruction) for most patients with a chronic Achilles rupture due to the functional deficit caused by the lack of an intact Achilles tendon. Numerous autograft options such as the flexor hallucis longus, hamstrings, peroneal and quadriceps tendon have been used to reconstruct the Achilles tendon, either as a tendon transfer or as an interposition graft. The choice of autograft used usually depends on the size of the defect left after debridement of the Achilles tendon edges, but is often dictated by surgeon preference and tissue availability. Currently, there is no consensus as to the best autograft option. The aim of this study was to evaluate the various autograft options used to reconstruct the Achilles tendon, and the advantages and disadvantages of using each tendon, focussing specifically on the harvesting technique, anatomical and biomechanical properties. This was done by reviewing the current published literature, supplemented by carrying out anatomical dissection in the cadaveric lab. The flexor hallucis longus is synergistically related to the Achilles tendon and biomechanically strong, however harvesting can result in weakness in big toe flexion. The peroneus brevis whilst being biomechanically strong is a much shorter tendon compared to the other autograft options. Similarly, the quadriceps tendon is also a strong tendon option, but may not be appropriate for larger chronic Achilles tendon rupture gaps. The semitendinosus tendon can be tripled/quadrupled to resemble the Achilles tendon, but is associated with higher risks of patient morbidity when harvesting the tendon. Treatment of chronic Achilles tendon ruptures remains a challenge. Each autograft option has its own unique advantages and disadvantages which should be considered on a case-specific basis. Further work is required to analyse the biomechanical properties of the autograft options to determine if one option is superior. [ABSTRACT FROM AUTHOR]

The peroneus muscles are muscles that mainly act in ankle eversion and can be divided into PL and PB, which have different but important roles in foot and ankle functions. Therefore, PL and PB dysfunction can lead to foot and ankle issues, making. selective strength exercise necessary. This study aimed to identify the effect of two different exercise techniques on PL and PB morphologies. Two interventions were performed on separate days: the PL intervention, in which a Thera-Band® was placed on the ball of the foot and pushed out from the contact point, and the PB intervention, in which the Thera-Band® was pulled from the base of the fifth metatarsal. Cross-sectional area (CSA) and thickness of the peroneus muscles at 25% (showing the PL morphology) and 75% (showing the PB morphology) proximal to the line connecting the fibular head and lateral malleolus, as well as ankle strength was measured before and immediately after the interventions and at 10, 20, and 30 min later. A repeated-measures two-way analysis of variance was conducted to identify differences in the effects of the interventions on the PL and PB. Main and interaction effects on CSA, thickness, and ankle strength, with a significant increase in CSA and thickness in the proximal 25% in the PL intervention and the distal 75% in the PB intervention immediately after implementation, were observed (p < 0.05). The transient increase in muscle volume due to edema immediately after exercise indicates the acute effect of exercise. The CSA and thickness of the proximal 25% in the PL intervention and the distal 75% in the PB intervention increased immediately after the intervention, indicating that these interventions can be used to selectively exercise the PL and PB. [ABSTRACT FROM AUTHOR]

This study aimed to compare the foot muscle morphology and foot posture between healthy adults and lifesavers in sandy beach sports. The participants included 15 lifesaver athletes and 15 healthy adults. Using a non-contact three-dimensional foot measurement device, the foot length, width, and arch height of the right foot were measured while standing and sitting without back support, and the transverse arch length ratio and arch height index were subsequently calculated. Muscle cross-sectional area was measured using an ultrasound imaging device. Muscle cross-sectional areas, arch height, foot width, arch height index, and transverse arch length ratio were larger in the lifesaver than in the healthy adult group. Lifesavers had higher arches and more developed intrinsic and extrinsic muscles than healthy adults. Performing physical activity while barefoot on sandy beaches may effectively develop the foot intrinsic and extrinsic muscles and raise the arch. [ABSTRACT FROM AUTHOR]

BACKGROUND: Weakness in the hip abductors can lead to lower limb misalignment and an elevated risk of injury. This can result in compensatory mechanisms at the ankle to maintain stability. AIM: To verify the effects of a single session of hip abductors resistance exercise until failure on the foot pronation and EMG amplitude of shank muscles (peroneus longus - PL; tibialis anterior - TA) during landing tasks. METHOD: Seventeen participants completed single-leg and double-leg landings both before and after a single session of hip abductors resistance exercise until failure. The exercise consisted of four sets of 10 repetitions maximum, with a 2-minute rest interval between each set. Measurements of PL and TA EMG amplitude and degree of foot pronation were performed during landings. RESULTS: We observed a greater degree of supination of the foot during single-leg compared to double-leg landing (p=0.006), without effect of exercise. Regarding TA EMG amplitude, there was no exercise effect (p=0.951), with a higher amplitude observed in double-leg compared to single-leg landing (p=0.001). EMG amplitude of PL was higher during single-leg compared to double-leg landing (p=0.003) and the exercise significantly reduced its activation in both tasks (p=0.032). CONCLUSION: Single-leg and double-leg landings exhibited variations in mechanics and activation patterns of the distal muscles. Following a single session of hip abductors resistance exercise until failure, there was a reduction in PL activation during landing tasks. This suggests that there were neuromuscular compensations occurring distally due to alterations in the hip abductor muscles. [ABSTRACT FROM AUTHOR]

Purpose: The purpose of this study was to investigate the effects of specialized Kyokushin karate exercises on the activity of leg muscles and the height of the medial longitudinal arch in adolescent girls with foot pronation. Methods: This study recruited twenty-four adolescent girls with foot pronation who voluntarily agreed to participate and were randomly assigned to either a training group (n=12) or control group (n=12). The training program consisted of eight weeks of specialized Kyokushin karate exercises. The fibularis longus, tibialis anterior, and lateral gastrocnemius muscles activity was measured during single-leg landing using surface electromyography. The medial longitudinal arch height was measured using the navicular drop test. All statistical analyses, including independent and paired t-tests, were conducted using SPSS software, version 26 at a significance level of 0.05. Results: The results showed that following eight weeks of specialized Kyokushin karate exercises, there was a significant increase in the activity levels of the tibialis anterior (P=0.005) and lateral gastrocnemius (P=0.04) muscles in the training group compared to the control group. However, there was no significant change in the activity of the fibularis longus muscle in the training group compared to the control group (P>0.05). Within the training group, there was a significant increase in the activity of all three measured muscles (fibularis longus, P=0.009; tibialis anterior, P=0.008; and lateral gastrocnemius, P=0.008) from post-test to pre-test (P<0.05). Additionally, the study found that the amount of navicular drop in the training group was significantly reduced compared to the control group (P=0.04) after eight weeks of training Conclusion: This study demonstrated that eight weeks of specialized Kyokushin karate exercises resulted in a significant increase in the activity levels of the tibialis anterior and lateral gastrocnemius muscles in adolescent girls with foot pronation. These exercises also improved the height of the medial longitudinal arch, indicating a potential solution for correcting flat feet. Therefore, we recommend Kyokushin karate exercises to improve muscle activity and arch height in adolescent girls with foot pronation. [ABSTRACT FROM AUTHOR]

Background: Inversion ankle injuries are extremely common, sometimes causing injury to the peroneus brevis tendon. If more than 50% of the tendon is injured, it oftentimes requires tenodesis to the adjacent peroneus longus tendon. Both Pulvertaft (PT) and side-to-side (SS) techniques have been used for joining the 2 tendons. The purpose of this study was to compare the strength and stiffness of these 2 techniques. Methods: Five matched pairs of cadaver ankle specimens were randomized to receive either an SS or PT tenodesis of the peroneus brevis to longus tendons. Following the tenodesis, the specimens were tested for failure load, displacement, energy absorbed at failure, and peak load. Stiffness was also calculated. Paired t tests were performed to detect differences between the 2 conditions. Results: There were no statistically significant differences between the SS and PT tenodesis for any of the metrics measured. For stiffness, the techniques were very similar (SS = 10.14 [4.35], PT = 12.85 [1.72]). Conclusion: There is no difference in failure load, displacement, energy absorbed at failure, peak load or stiffness between the PT and SS techniques for peroneal tenodesis. [ABSTRACT FROM AUTHOR]

Background: Despite extensive evidence of excellent biomechanical and clinical outcomes of ligament reconstructions with bone-patellar tendon-bone, hamstring tendon, and quadriceps tendon autografts, these are not without limitations, including knee-related donor site morbidity, decreased range of motion, and potential for anterior knee pain. Therefore, researchers have explored other options, including the peroneus longus (PL) autograft. Indication: Anterior cruciate ligament (ACL) reconstruction (both primary and revision), as well as multiligament reconstruction, particularly in areas where access to allografts is limited. Surgical Technique: A 3-cm longitudinal skin incision is placed 2 fingerbreadths (or 3 cm) proximal to the tip of the lateral malleolus, and 3 mm posterior to the fibula. The PL and peroneus brevis tendons are identified and isolated, followed by a tenodesis at the distal limit of the incision. The PL is whipstitched proximal to the tenodesis site, and then incised between the tenodesis and whipstitched portion. A closed tendon stripper is inserted and advanced proximally until the PL graft is released. Discussion/Conclusion: PL autograft harvest has been shown to generate thicker and longer grafts relative to the semitendinosus, with demonstrated efficacy in terms of both biomechanical and clinical outcomes. Current literature points largely to a good safety profile, although there is still conflicting evidence in terms of foot and ankle morbidity and no mid- to long-term follow-up data available. Patient Consent Disclosure Statement: The author(s) attests that consent has been obtained from any patient(s) appearing in this publication. If the individual may be identifiable, the author(s) has included a statement of release or other written form. Graphical Abstract This is a visual representation of the abstract. [ABSTRACT FROM AUTHOR]

Background: The anterior half of the peroneus longus tendon (AHPLT) has been reported to be a suitable autograft for ligament reconstruction with low donor-site morbidity. However, clinical data on graft size are limited. Purpose: To determine (1) if there is any difference in size between the AHPLT and semitendinosus tendon (ST) and (2) whether anthropometric measurements can predict autograft size. Study Design: Cross-sectional study; Level of evidence, 3. Methods: A total of 128 consecutive patients scheduled for knee ligament reconstruction were prospectively enrolled. Patients were treated with AHPLT (50%) or ST (50%). Data included anthropometric measurements and intraoperatively recorded graft size. A Student t test was used to determine differences between the groups. Bivariate correlation coefficients and multivariate regression analyses were calculated to identify relationships between graft size and anthropometric measurements. Results: The AHPLT and ST groups were equally distributed according to age, sex, height, weight, and body mass index (BMI). The quadrupled graft length for the AHPLT was 7.3 ± 0.6 cm as compared with 7.5 ± 0.7 cm for the ST (P <.05). The quadrupled graft diameter was 7.7 ± 0.8 mm for the AHPLT and 8.0 ± 0.7 mm for the ST (P <.05). Height had a moderate (r = 0.57) to high (r = 0.68) correlation with AHPLT and ST length, respectively (P <.01). Weight had a moderate correlation (r = 0.43) with AHPLT diameter (P <.01) but only a weak correlation (r = 0.19) with ST diameter (P >.05). A significant interaction effect of BMI and thigh circumference on ST graft diameter was found, which showed that the effect of thigh circumference on ST graft diameter decreased significantly as BMI increased (P <.05). This moderating effect of BMI could not be observed for the coefficient of shank circumference on AHPLT graft diameter (P >.05). Conclusion: (1) The peroneus longus split tendon provides a reliable autograft size for knee ligament reconstructions. It was prone to be slightly shorter and thinner than the ST. (2) Patient height was the strongest predictor for AHPLT and ST graft length. However, predicting graft diameter based on thigh or shank circumference was more challenging, with higher BMIs affecting the ability to predict ST more than AHPLT. [ABSTRACT FROM AUTHOR]

Children with cerebral palsy develop foot deformities due to a combination of factors including muscle shortening, hypertonia, weakness, and cocontraction of muscles acting at the ankle joint resulting in an altered gait pattern. We hypothesized these factors affect the peroneus longus (PL) and tibialis anterior (TA) muscles couple in children who develop equinovalgus gait first followed by planovalgus foot deformities. Our aim was to evaluate the effects of abobotulinum toxin A injection to the PL muscle, in a cohort of children with unilateral spastic cerebral palsy and equinovalgus gait. This was a prospective cohort study. The children were examined within 12 months before and after injection to their PL muscle. Twenty-five children of mean age 3.4 (S.D.: 1.1) years were recruited. We found significant improvement in foot radiology measures. Passive extensibility of the triceps surae did not change, whereas active dorsiflexion increased significantly. Nondimensional walking speed increased by 0.1 (95% confidence interval [CI], [0.07, 0.16]; P < 0.001), and the Edinburgh visual gait score improved by 2.8 (95% CI, [-4.06, -1.46]; P < 0.001). Electromyography showed increased recruitment for gastrocnemius medialis (GM) and TA but not for PL during the reference exercises (standing on tip toes for GM/PL, active dorsiflexion for TA) and decreased activation percentages for PL/GM and TA across sub-phases of gait. One key advantage of treating the PL muscle only might be to address foot deformities without interfering with the main plantar flexors that are instrumental to support body weight during gait. [ABSTRACT FROM AUTHOR]

Multiple graft options are available for knee ligament surgeries, one of the latest being peroneus longus grafts. Despite, an increasing usage of PL for graft harvest there is a scarcity of technique guides for its harvest, finding mention in only a few case studies. The following is a technical note dedicated to peroneous longus graft harvest. [ABSTRACT FROM AUTHOR]

Purpose. Peroneus longus tendon graft is not a popular first choice for ACL reconstruction. However, newer literature has shown good outcomes with its use. This study compares functional outcome and donor site morbidity of peroneus longus with hamstring tendon autograft to assess if it can be considered as one of the first choices for ACLR. Methods. This prospective cohort study involves 54 patients who underwent arthroscopic single-bundle ACLR. 27 patients each were operated on with hamstring and peroneus longus autografts. At 2 years follow-up, functional outcome was compared between groups using International Knee Documentation Committee (IKDC), Modified Cincinnati, and Tegner-Lysholm scores. Donor site morbidity in the peroneus longus group was assessed using Foot and Ankle Disability Index (FADI) and The American Orthopaedic Foot and Ankle Society (AOFAS) scores. Results. At 2 years follow-up, there was no statistically significant difference in the mean IKDC (77.26 vs 80.78), Modified Cincinnati (84.41 vs 89.07), and Tegner-Lysholm scores (85.19 vs 88.78) between the hamstring and peroneus groups respectively. Mean FADI and AOFAS scores at 2 years follow up were 96.11 and 91.67 respectively in the peroneus group suggesting no significant donor site morbidity as compared to preoperative scores. Conclusions. Peroneus longus performs similar to hamstring grafts and can be considered as one of the first choices for arthroscopic ACL reconstruction. [ABSTRACT FROM AUTHOR]

Although neuromuscular deficits in people with chronic ankle instability (CAI) have been identified, previous researchers have mostly investigated the activation of multiple muscles in isolation. Investigating muscle synergies in people with CAI would provide information about the coordination and control of neuromuscular activation strategies and could supply important information for understanding and rehabilitating neuromuscular deficits in this population. To assess and compare muscle synergies using nonnegative matrix factorization in people with CAI and healthy control individuals as they performed different landing-cutting tasks. Cross-sectional study. Laboratory. A total of 11 people with CAI (5 men, 6 women; age = 22 ± 3 years, height = 1.68 ± 0.11 m, mass = 69.0 ± 19.1 kg) and 11 people without CAI serving as a healthy control group (5 men, 6 women; age = 23 ± 4 years, height = 1.74 ± 0.11 m, mass = 66.8 ± 15.5 kg) participated. Muscle synergies were extracted from electromyography of the lateral gastrocnemius, medial gastrocnemius, fibularis longus, soleus, and tibialis anterior (TA) muscles during anticipated and unanticipated landing-cutting tasks. The number of synergies, activation coefficients, and muscle-specific weighting coefficients were compared between groups and across tasks. The number of muscle synergies was the same for each group and task. The CAI group exhibited greater TA weighting coefficients in synergy 1 than the control group (P =.02). In addition, both groups demonstrated greater fibularis longus (P =.03) weighting coefficients in synergy 2 during the unanticipated landing-cutting task than the anticipated landing-cutting task. These results suggest that, although both groups used neuromuscular control strategies of similar complexity or dimensionality to perform the landing-cutting tasks, the CAI group displayed different muscle-specific weightings characterized by greater emphasis on TA function in synergy 1, which may reflect an effort to increase joint stability to compensate for ankle instability. [ABSTRACT FROM AUTHOR]

The purpose of this study was to evaluate the effect of a single treatment vs serial dry needling (DN) treatments of the fibularis longus on individuals with chronic ankle instability and to determine the longevity of any effect found. Thirty-five adults with chronic ankle instability (24.17 ± 7.01 years, 167.67 ± 9.15 cm, 74.90 ± 13.23 kg) volunteered for a university laboratory repeated-measures study. All participants completed patient-reported outcomes and were objectively tested using the Star Excursion Balance Test (SEBT), threshold to detect passive motion (TTDPM) measurements, and single limb time-to-boundary measurements. Participants received DN treatment to the fibularis longus once weekly for 4 weeks on the affected lower extremity by a single physical therapist. Data were collected 5 times: baseline 1 week before initial treatment (T0), pre-treatment (T1A), immediately after the first treatment (T1B), after 4 weekly treatments (T2), and 4 weeks after the cessation of treatment (T3). Significant improvements were found for clinician-oriented (SEBT-Composite P <.001; SEBT-Posteromedial P =.024; SEBT-Posterolateral P <.001; TTDPM-Inversion P =.042) and patient-oriented outcome measures (Foot and Ankle Ability Measure–Activities of Daily Living P <.001; Foot and Ankle Ability Measure–Sport P =.001; Fear Avoidance Belief Questionnaire P =.021) following a single DN treatment. Compounding effects from additional treatments exhibited improvement of TTDPM (T1B to T2). No significant losses were noted 4 weeks after cessation of treatment (T2 to T3). For the participants in this study, outcomes improved immediately following the first DN treatment. This improvement was sustained but not further improved with subsequent treatments. [ABSTRACT FROM AUTHOR]

Purpose: Peroneus longus tendon (PLT) autograft has been successfully used for isolated anterior cruciate ligament (ACL) or posterior cruciate ligament (PCL) reconstruction cases. Being a powerful evertor and flexor of great toe, there might be associated ankle morbidity with this autograft option. However, there are only a few studies exploring whether the ankle morbidity is significant or not. This study aims to assess the functional outcomes, donor site morbidity, and ankle strength after harvesting ipsilateral peroneus longus autograft for ACL reconstruction in revision ACL and multi-ligament injury cases. Methods: This was a prospective case series. All of the patients were evaluated by clinical examination for knee for laxity, ankle joint stability, and using visual analog scale (VAS) for pain, International Knee Documentation Committee (IKDC) score, and Lysholm score, preoperatively and postoperatively at two-year follow-up. Morbidity of donor ankle was assessed using American Orthopedic Foot and Ankle Society (AOFAS) score, bilateral evertors, and first ray plantarflexion strength measurement using an isometer (Innovative Design Orthopedics) at two-year follow-up. Results: Ipsilateral PLT graft was used in ten patients of revision ACL reconstruction and 27 patients of the multi-ligament knee injury. The mean length of PLT harvested (cm) was 26.2 (standard deviation 2.6, range 22–31), and mean diameter of the doubled graft (mm) was 7.9 (standard deviation 0.68, range 7.5–8.5). There was a significant improvement in VAS score for pain, Lysholm, and IKDC scores (p = < 0.001) at two -year follow-up. There were no cases of graft failure, superficial, or deep infection. Ankle dorsiflexion(p = 0.32), ankle plantarflexion (p = 0.19), eversion strength(p = 0.6), first ray plantarflexion strength(p = 0.52), and AOFAS score(p = 0.29) were found to be comparable to the normal side in all patients. Conclusions: Peroneus longus autograft can be considered as a potential autograft option for ACL reconstruction in multi-ligament knee injuries and revision ACL reconstruction. No significant donor site morbidity was noted at follow-up. Level of evidence: Level IV. [ABSTRACT FROM AUTHOR]

Background: Flatfoot is a deformity in which the foot is flattened due to a decrease in or loss of the medial longitudinal arch. Statement of the problem: Few studies have investigated the relationship between the severity of flat feet, trunk strength, and joint flexibility. Purpose: The aim of this study is to investigate the relationship between the severity of flatfoot and joint flexibility and foot and trunk strength in children with flexible flatfoot. Methods: This study included 16 children (boys, 12; girls, 4; age, 4~8 years) with flexible flatfeet. We examined the resting calcaneal stance position angle (RCSPA) and foot posture index (FPI) scores for clinical severity and radiographic parameters, such as calcaneal pitch angle, talometatarsal angle (TMA), and talocalcaneal angle (TCA). Muscle thicknesses of the tibialis posterior (TP), peroneus longus (PL), and L1 multifidus were measured by sonography. Isometric contraction of ankle inversion, eversion in a seating position, and lumbar extension at a prone position were induced using a handheld dynamometer to measure the maximum muscle strength for each muscle. Beighton's scoring system was used to assess joint flexibility by evaluating the hyperextension of the joint for each category when performing stretching motion. Spearman's rank correlation coefficient for nonparametric data was used. Results: The FPI showed a moderately negative correlation with the muscle thickness of TP (r = −0.558, p = 0.009) and L1 multifidus (r = −0.527, p = 0.012), and the strength of the ankle inverter (r = −0.580 p = 0.005) and lumbar extensor (r = −0.436 p = 0.043). RCSPA showed a moderately positive correlation with TCA (r = 0.510, p = 0.006). Beighton's score showed no significant correlation with all parameters. Conclusion: In children with flatfoot, FPI reflected the clinical severity; thus, the more severe the symptoms, the weaker the ankle inverter and lumbar extensor. [ABSTRACT FROM AUTHOR]

Background: Fencing is an agility sport and is characterized by a combination of short and frequent high intensity movements. Proprioceptive training demonstrates a positive effect on athletes' performance. It is effective in increasing dynamic balance by reducing ankle muscle reaction time that stabilize joint. Objective: The aim of this study was to verify influence of a 12-week proprioceptive training program on ankle instability, jumping performance and ankle muscle's reaction time during Lunge in fencing athletes. Method: The study was a clinical trial, non-randomized, with 19 fencing athletes from 14-35-year-old, divided in intervention group (n=10) and control group (n=9). The study was performed in four stages: familiarization of jump performance; pre-intervention; intervention and post-intervention. At pre-intervention was evaluated jump performance, ankle muscle reaction time and functional ankle instability. At the intervention, athletes performed 30 minutes of proprioceptive training for 12 weeks, three times a week. At post-intervention, the same pre-intervention tests were performed. Data were presented in mean and standard error, submitted to the Generalized Estimates Equations test with Bonferroni post hoc. The level of significance was 0,05. Results: Jump performance decreased significantly in both groups. Anterior tibial muscle reaction time did not differ neither in any of groups, nor in any of legs. The peroneus longus and lateral gastrocnemius reaction time decreased significantly in both groups. Regarding functional ankle instability, athletes had instability at pre- and post-intervention time. Conclusion: Proprioceptive training program was not able to improve jump performance, nor to decrease ankle muscle reaction time or improve athletes' perception of ankle stability. [ABSTRACT FROM AUTHOR]

This article will review the anatomy and common pathologies affecting the peroneus longus muscle and tendon. The anatomy of the peroneus longus is complex and its long course can result in symptomatology referable to the lower leg, ankle, hindfoot, and plantar foot. Proximally, the peroneus longus muscle lies within the lateral compartment of the lower leg with its distal myotendinous junction arising just above the level of the ankle. The distal peroneus longus tendon has a long course and makes two sharp turns at the lateral ankle and hindfoot before inserting at the medial plantar foot. A spectrum of pathology can occur in these regions. At the lower leg, peroneus longus muscle injuries (e.g., denervation) along with retromalleolar tendon instability/subluxation will be discussed. More distally, along the lateral calcaneus and cuboid tunnel, peroneus longus tendinosis and tears, tenosynovitis, and painful os peroneum syndrome (POPS) will be covered. Pathology of the peroneus longus will be illustrated using clinical case examples along its entire length; these will help the radiologist understand and interpret common peroneus longus disorders.

This study aims to investigate the anatomical factors that are effective in the formation of peroneal tendon tears comparing with the control group. The patients with ankle magnetic resonance imaging (MRI) due to pain on the lateral side of the ankle were retrospectively analyzed using the clinical archive between July 2015 and January 2020. Peroneal tendon tears, peroneal tubercle type and size, presence of peroneal quartus, presence and type of retromalleolar groove, retromalleolar groove area, lateral malleolus type, presence of os peroneum, peroneus brevis-lateral malleolus distance (PBLMD), and accompanying pathologies in coronal, axial, and sagittal planes MRI were evaluated. PBLMD was measured as 27.1 ± 12.3 mm in Group 1. With PBLMD, it was measured as 39.6 ± 11.68 mm in Group 2. There was a significant relationship between low-lying peroneus brevis muscle and peroneal tear (p <.001). Peroneal tendon tear was more common in patients with peroneal quartus muscle (p <.001). There was a relationship between the retromalleolar groove type and the presence of peroneal tear (p =.004). More peroneal tears were observed in the concave retromalleolar groove type. The presence of concave type retromalleolar groove, peroneus quartus, and low-lying peroneus brevis muscle was found to be associated with peroneal tendon tears. [ABSTRACT FROM AUTHOR]

Autograft options for anterior cruciate ligament reconstruction over the years have gone from bone-patellar tendon-bone to hamstring to peroneus longus tendon. Considering the drawbacks of other autografts, we analyse peroneus longus autograft holistically as a viable alternative. This was a prospective study of 113 patients undergoing anterior cruciate ligament reconstruction with peroneus longus autograft between January 2017 and November 2018 for isolated, full-thickness ACL tears. Functional analysis was done using the Tegner-Lysholm score pre-operatively, at 6 months, 1 year, 2 years, and 3 years postoperatively. At terminal follow-up, stability was checked clinically by Lachman test, residual morbidity of donor site was assessed using foot and ankle disability index, and radiographic correlation was done with magnetic resonance imaging. The mean diameter of the graft after tripling was 9 ± 0.71 mm and the average length before tripling was found to be 27.07 ± 2.76 cms. At terminal follow-up, 101 patients showed excellent, while 12 patients showed good outcomes. The mean foot and ankle disability index was 94.8 ± 3. 90.27% of patients had no laxity on clinical examination, and magnetic resonance imaging of all the patients at terminal follow-up showed good graft uptake. Peroneus longus autograft shows intraoperative consistency and gives excellent functional outcome, clinical stability, and no donor site morbidity even three years postoperatively. [ABSTRACT FROM AUTHOR]

Introduction/aims: Motor unit number estimation (MUNE) methods may be valuable to detect motor involvement earlier than compound muscle action potential (CMAP) amplitude. The most recent MUNE method, MScanFit, has been shown to have advantages compared with previously described methods. However, MScanFit has only been applied in a few lower extremity muscles. In this study we examined the feasibility and reliability of MScanFit in peroneus longus muscle.Methods: Twenty healthy controls (16 males and 4 females; mean age, 36.05 ± 2.58 years) were examined twice within a 1- to 2-week interval. Fibular nerve was stimulated at the knee and CMAP scans were recorded from peroneus longus muscle. From this, MScanFit MUNE and size parameters were calculated, as was the CMAP amplitude. The reliability was examined using coefficient of variation (CV) and intraclass correlation coefficient (ICC). MUNE was correlated with CMAP amplitude using linear regression analysis.Results: The CV between sessions was higher for CMAP amplitude (11.63 ± 1.88%) than MScanFit MUNE (3.13 ± 0.78%). Among the size parameters, mean unit amplitude (μV) showed the lowest CV (11.46 ± 1.77%). Using ICC, CMAP amplitude exhibited good reliability (0.787), whereas that of MScanFit MUNE was excellent (0.902). Reliability was good for all size parameters. There was no significant correlation between MScanFit MUNE and CMAP amplitude (R = 0.25, P > .05).Discussion: MScanFit MUNE is feasible in the peroneus longus muscle, with high test-retest reliability in healthy subjects. Studies in patients are needed to examine the sensitivity of this muscle in disease. [ABSTRACT FROM AUTHOR]

Purpose: The current research aims to examine the effect of taping on the feedforward activity of the lower limb muscles in elite volleyball players with and without chronic ankle instability while performing single-leg jump-landing. Methods: The electromyographic activities of the lateral gastrocnemius, tibialis anterior, peroneus longus, rectus femoris, gluteus medius, and vastus lateralis of the non-dominant leg were registered before and after taping in 26 volleyball players while performing the spike skill with single-leg landing. These volleyball players entered the research by purposive sampling. The root mean square (RMS) was employed to compute muscle activity before and after taping. The multivariate analysis of variance (MANOVA) test at P=0.05 was utilized to analyze the data. Results: The results of the multivariate analysis of variance (MANOVA) test demonstrated that the groups did not have a significant factor in any of the variables in the feedforward phase, except for the maximum root mean square (RMS) of the peroneus longus muscle (P=0.01). Conclusion: The results showed that taping cannot improve the feedforward activity of the selected muscles during single-leg landing in people with chronic ankle instability. Therefore, it is recommended to use other methods and exercises to improve the muscle feedforward activity in these individuals during the rehabilitation phases. [ABSTRACT FROM AUTHOR]