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Patients with established rheumatoid arthritis (RA) are at risk of developing secondary sarcopenia. Both pharmacological and exercise interventions are essential for treatment. However, for such patients, exercise loads may lead to the progression of joint destruction and worsening of pain. The purpose of this report was to assess the feasibility of a home-based, low-intensity resistance exercise programme. The case was a 70-year-old female patient with sarcopenia secondary to RA. She was diagnosed with RA at 57 years of age and began medication, maintaining remission of disease activity. However, she did not exercise habitually and was relatively inactive in her daily life. Furthermore, she had kinesiophobia associated with her RA-related symptoms. We suggested implementing a home-based low-intensity resistance exercise programme >3 months, with the goal of exercising the lower extremities daily. The patient was asked to self-monitor using an exercise diary and attend monthly outpatient visits for repeat counselling and feedback. As a result, she was able to perform the exercise programme safely with high compliance, improving her kinesiophobia as well as physical inactivity, although her skeletal muscle mass did not change. Regular exercise and increased physical activity may help prevent the onset of sarcopenia. These results demonstrate the feasibility of implementing our exercise programme and support its potential for preventing the progression of sarcopenia. While questions remain in terms of treating sarcopenia, we believe that our findings will lead to the establishment of an exercise programme for patients with sarcopenia secondary to established rheumatoid arthritis.

Foot impairment in rheumatoid arthritis (RA) may exacerbate sarcopenia from physical inactivity because of foot pain while walking. The present study aimed to investigate the prevalence of sarcopenia in patients with RA-associated foot impairment, and whether treatment with a foot orthosis improved physical activity and muscle quantity.Thirty-two patients with RA were diagnosed as sarcopenic or nonsarcopenic, and the prevalence of sarcopenia was determined. Eleven patients with sarcopenia were treated with a foot orthosis. The following parameters were compared between baseline and after 6 months of treatment: physical activity (walking, moderate-intensity activity, and vigorous-intensity activity), foot pain while walking, Health Assessment Questionnaire (HAQ) score, and body composition parameters, including muscle quantity.Sarcopenia was present in 25/32 patients (78.1%). The use of a foot orthosis improved walking activity (Patients with RA-associated foot impairment had a high rate of sarcopenia. Treatment with a foot orthosis increases light-intensity physical activity such as walking, but does not enhance moderate-to-vigorous-intensity activities or increase muscle quantity.

Background Post-polio syndrome-induced muscle weakness may develop in limbs that have had normal muscle strength and have been considered unaffected by polio. Objective To investigate the utility of electromyography (EMG) for predicting future muscle weakness in clinically unaffected limb muscles of polio survivors. Design Retrospective study. Setting Academic polio clinic. Participants Polio survivors (N = 77) who underwent EMG between April 2008 and March 2010 and were followed for at least 2 years. Materials and methods Chart reviews were conducted to extract baseline EMG and manual muscle strength test (MMT) results to investigate the relationship between baseline EMG abnormalities and change in muscle strength over 2 years for various upper and lower limb muscles that control movement in the limb joints. Main outcome measurements Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of EMG findings for prediction of subsequent muscle weakness. Results EMG data were available for 44 deltoid, 59 biceps brachii, 60 triceps brachii, 59 vastus lateralis, 59 tibialis anterior, and 55 gastrocnemius (medial head) muscles. The percentage of muscles with an initial MMT of grade 5 that developed weakness over 2 years of follow-up was approximately 15% for most muscle types. Sensitivity of EMG to predict subsequent weakness was higher in the lower limbs (0.67-1.00). Specificity was higher in the biceps brachii (0.83). PPV was higher in the biceps brachii (0.50). NPV was higher in the lower limbs (0.89-1.00) but lower in the deltoid (0.75). Conclusion EMG abnormalities were detected in some clinically normal muscles of polio survivors. EMG abnormalities predicted muscle weakness 2 years later, although the strength of this relationship varied depending on the muscle.

Patients with rheumatoid arthritis (RA)-related foot impairment have a high rate of sarcopenia. Treatment using a foot orthosis (FO) enables not only a reduction in pain while walking but also an increase in physical activity, helping to prevent further loss of muscle mass. However, the primary goal of treating RA is to maximize patients' long-term quality of life (QOL). We investigated whether FO treatment both increases physical activity and improves QOL.Among 31 patients with RA-related foot impairment, 15 with sarcopenia were treated with an FO for 6 months. Foot-specific QOL (measuring using the Self-Administered Foot Evaluation Questionnaire), foot pain, activities of daily living, and physical activity (walking-intensity activity and moderate- to vigorous-intensity activity) were compared before treatment and after 6 months of treatment.Ten patients who completed 6 months of follow-up were analyzed. Significant QOL improvements were found in the Pain and Pain-Related category and the Physical Functioning and Daily Living category (P = 0.02-0.04); however, no significant changes were found in the Social Functioning, General Health and Well-Being, or Shoe-Related categories (P = 0.09-0.21). Foot pain and activities of daily living significantly improved (P = 0.01-0.04). Physical activity significantly increased for walking-intensity activity (P = 0.04) but did not change for moderate- to vigorous-intensity activity (P = 1.00).FO treatment in patients with RA-related foot impairment and sarcopenia increased light-intensity physical activity such as walking and improved physical QOL.

Purpose: To identify factors associated with falls in Japanese polio survivors and assess the extent of their impact.Materials and methods: Subjects were 128 polio survivors. Fall history and fear ...

[Purpose] Stand-and-ride personal mobility devices controlled by movements of the user's center of gravity are used for balance training. We aimed to describe the physical activity required to operate this type of mobility device. [Participants and Methods] Eleven healthy males performed the following tasks: 1) moving their center of gravity forward or backward while standing on the floor (control task) and, 2) moving the mobility device forward or backward by moving their center of gravity (experimental task). [Results] We observed that the displacement of the center of gravity and the center of pressure, as well as angular displacements of the hips and knee joints, and maximum muscle activities of the biceps femoris, the medial head of the gastrocnemius and peroneus longus muscles were lesser during the experimental than during the control task. The distance moved by the device was significantly greater than the displacement of the user's center of gravity during the experimental task. [Conclusion] We observed that moving the device forward or backward required lesser physical activity than that required to shift the user's center of gravity forward or backward while standing on the floor. Additionally, we observed that even a small displacement of the user's center of gravity produced a large displacement of the device. We concluded that during balance training, the greater and more easily perceived movement of the mobility device would provide helpful feedback to the user.

OBJECTIVE The aim of this study was to examine the correlation between basic movement ability and activities of daily living (ADL) in elderly patients after hip fracture surgery and predict ADL outcomes from changes in basic movement ability. DESIGN Fifty-four patients receiving rehabilitation after hip fracture surgery were collected prospectively. Ambulatory ability was evaluated using a Basic Movement Scale (BMS), and ADL was evaluated using the motor subscale of the Functional Independence Measure (motor-FIM). From the results of evaluating BMS and motor-FIM weekly, the important postoperative period to regain ADL was investigated. RESULTS There was a close correlation between BMS and motor-FIM scores at each evaluation point (r = 0.971, P < 0.001) and a significant correlation between weekly BMS and motor-FIM gains (r = 0.741, P < 0.001). Cluster analysis of BMS scores from postoperative week (POW) 2 to 12 showed three patterns of change, with BMS scores at POW 2 reflecting the outcome. CONCLUSIONS The very strong correlation between BMS and motor-FIM scores suggests that BMS is a favorable indicator of changes in ADL. Because basic movement ability at POW 2 also reflected the prognosis, constructive interventions should be implemented early to help patients ambulate and regain other basic movements by no later than POW 2.

A method for measuring occipitocervical angle.To develop a new method of measurement for assessing the occipitocervical angle using intraoperative fluoroscopic imaging, and to examine its reliability.To avoid postoperative complications following occipitocervical fusion, it is vital to obtain a suitable fusion angle between the occipital bone and the upper cervical spine.The subjects were 30 cases with occipito-atlanto-axial lesions and 30 healthy volunteers. Lateral plain radiographs of the cervical spine in neutral position were used to draw the McGregor line, the line between the external occipital protuberance and the most caudal point on the midline occipital curve (Oc line), the tangential line of the inferior endplate of the C2 vertebra (C2 line), and the posterior longitudinal line of the C2 vertebra (Ax line). The angles formed by these 4 lines and the horizontal line were measured. The O-C2 angle and the Oc-Ax angle, the new indicator, were measured by 3 doctors and reliability was evaluated.In the disease group, mean intraobserver variances of the McGregor, Oc, C2, Ax, O-C2, and Oc-Ax angles were 0.7, 1.3, 1.5, 1.2, 1.6, and 1.9 degrees. Mean intraobserver intraclass correlation coefficients were 0.997, 0.994, 0.994, 0.997, 0.989, and 0.988, showing high intraobserver reliability for all angles. Mean interobserver intraclass correlation coefficients were 0.998, 0.996, 0.994, 0.997, 0.988, and 0.990, showing high interobserver reliability for all angles. The same reliability was obtained in the healthy group.The Oc-Ax angle is as reliable an indicator as the conventional O-C2 angle, and could be used as a new intraoperative indicator for occipitocervical fusion. It may be particularly useful in cases where it is difficult to identify the McGregor line and/or the inferior endplate of the C2 vertebra.Level 3-diagnostic study.

Objective The aim of the study was to investigate the validity of using total score and to examine the constitution and characteristics of the Basic Movement Scale in postsurgery patients with hip fracture. Design The dimensionality and the threshold difficulty intervals between each score and item difficulty hierarchy of the Basic Movement Scale were examined using factor analysis and Rasch analysis in 37 patients admitted to our hospital between April and November 2015. Results For factor analysis, the contribution ratio of the first factor was 78.9%, that of the second factor was 6.5%, and there were no items that fit the Rasch analysis. The threshold was reversed at 6 of the 48 locations. The difficulty of the 12 Basic Movement Scale items was distributed roughly evenly among all 9 lots, with some deviation. There was one very easy item, and there were some items almost overlapping in difficulty. Conclusions The results showed a unidimensional association between the items and evaluation index. The difficulty threshold of each score was approximated to the interval scale. Therefore, the Basic Movement Scale has evident construct validity and enables quantitative evaluation of physical ability, assessment of the effects of daily training, and general predictions of the feasibility of patients' clinical goals.

To examine the recurrence of deformity after silicone implant arthroplasty combined with resection arthroplasty for severe forefoot deformity in patients with rheumatoid arthritis.We reviewed the long-term results of this procedure for 27 feet in 15 patients. Their average age and disease duration at the time of operation were 58.6 years and 17.5 years, respectively, and the average follow-up period was 10.3 years.An improved hallux valgus angle (45.3° preoperatively, 23.6° 6 months after operation) was maintained. By contrast, deformity and dislocation of lesser toe had recurred at the final follow-up; the angle between the proximal phalanx and the metatarsal of the second toe improved 13.4° with recurrence of 22.5°, the angle between the proximal phalanx and ground surface improved 22.4° with recurrence of 34.5. Furthermore, claw toe deformity at the final follow-up was significantly worse in the group whose hallux valgus deformity was observed 6 months after operation.This procedure could maintain the alignment of the first metatarsophalangeal joint, but the recurrence of claw toe deformity is a problem and the relation between the first toe and the lesser toe is an important consideration.

Background Various posterior elbow problems cause posterior elbow pain among baseball players. We aimed to determine the prevalence and diagnoses associated with posterior elbow problems and post-treatment recovery time for returning to sports in Japanese high school baseball players when treated in the off-season. Methods A total of 576 Japanese high school baseball players who participated in baseball skill training camp during the off-season were enrolled in the study. The elbow of each player's throwing arm was assessed by use of a questionnaire and physical examination. Players with abnormal results were advised to visit the hospital. Players who visited the hospital were initially treated conservatively and underwent surgery if necessary. Retrospectively, players with positive physical examination results associated with posterior elbow pain, defined as olecranon tenderness and/or a positive elbow extension impingement test, were selected. Information about their position, elbow pain, physical examination results, diagnosis, treatment, and recovery time before returning to playing sports was assessed. Results Olecranon tenderness and/or positive elbow extension impingement test results were found in 76 players (13.2%). Of these, 33 agreed to visit the hospital for further diagnostic imaging and 25 players (75.8%) were diagnosed with posteromedial elbow impingement. By the next spring, 87.9% of players returned to sport, and 100% of players returned to sport before the next summer. The average recovery period was 77 ± 47 days. Conclusion Physical examinations related to posterior elbow injuries were positive in 13.2% of high school baseball players. The most common diagnosis for posterior elbow pain was posteromedial elbow impingement. All players returned to competitive sports activity levels within 77 ± 47 days.

Background:Sarcopenia is a progressive systemic skeletal muscle disorder associated with an increased likelihood of adverse outcomes including physical disability, falls, and mortality. The muscle mass of patients with rheumatoid arthritis (RA) is lower than that of age-matched healthy individuals, and a high prevalence rate of sarcopenia has been reported1). In particular, foot deformities may increase the prevalence rate of sarcopenia because of inactivity due to foot pain on walking. Treatment with a foot orthosis (FO) can reportedly reduce pain2); however, whether a FO can resolve inactivity and sarcopenia is unclear.Objectives:To elucidate the effectiveness of a FO on physical activity and sarcopenia in patients with RA.Methods:Thirty patients with RA with foot deformities were enrolled from April 2017 to December 2019. Sarcopenia was diagnosed using the algorithm of the European Working Group on Sarcopenia in Older People, and the cut-off values of the Asian Working Group for Sarcopenia were applied. We also collected the clinical variables of patients with concurrent RA and sarcopenia who continued to use a FO for 6 months. The primary outcome was physical activity determined by the International Physical Activity Questionnaire. The secondary outcomes were foot pain measured with a visual analog scale; activities of daily living (ADL) measured with the Health Assessment Questionnaire; and body mass index, body fat percentage, and the skeletal muscle mass index measured with a body composition device. The clinical variables were compared between baseline and 6 months after continuous treatment with a FO.Results:The prevalence rate of sarcopenia was 76.6% (23/30), and nine patients with RA continued to use the FO for 6 months. Table 1 shows outcomes at baseline and after 6 months of treatment with a FO. The only clinical variable that showed a significant difference was foot pain. Physical activities, ADL, and body compositions were maintained after 6 months.Table 1.Outcomes of 6-month treatment with FOBaseline6 monthsp valuePhysical activityIPAQWalking, MET-min/weekModerate, MET-min/weekVigorous, MET-min/week132 (66, 594)0 (0, 0)0 (0, 0)594 (396, 2376)0 (0, 0)0 (0, 0)0.071.000.32Foot painVAS score4.6 (3.1, 7.4)2.8 (1.1, 4.7)0.02ADLHAQ1.5 (1.1, 2.3)1.1 (0.9, 1.5)0.07Body compositionBMI, kg/m2BFP, %SMI, kg/m221.4 (20.7, 22.7)31.1 (24.2, 37.6)5.2 (4.8, 5.3)20.7 (19.3, 22.1)32.9 (26.3, 36.5)5.2 (5.0, 5.2)0.890.820.61IPAQ: International Physical Activity Questionnaire, VAS: visual analog scale, ADL: activities of daily living, HAQ: Health Assessment Questionnaire, BMI: body mass index, BFP: body fat percentage, SMI: skeletal muscle mass indexData are presented as median (lower quartile, upper quartile)Conclusion:The prevalence rate of sarcopenia in patients with RA with foot deformities was much higher than previous reported1). However, 6 months of treatment with a FO not only reduced foot pain but also maintained physical activity and muscle mass. Physical therapy has recently been recommended for patients with inflammatory arthritis. physical activity and muscle mass of patients with RA and concurrent foot deformities may be increased by combining physical therapy with orthotic treatment.References:[1]Tada M, et al. Matrix metalloprotease 3 is associated with sarcopenia in rheumatoid arthritis - results from the CHIKARA study. Int J Rheum Dis. 2018; 21 (11): 1962-9.[2]Hennessy K, et al. Custom foot orthoses for rheumatoid arthritis: A systematic review. Arthritis Care Res (Hoboken). 2012; 64 (3): 311-20.Acknowledgments:This work was supported by JSPS KAKENHI Grant Numbers JP19K11420.Disclosure of Interests:None declaredDOI: 10.1136/annrheumdis-2020-eular.3143

Introduction The objective of this study is to examine the relationships between treatment outcome and changes in magnetic resonance (MR) imaging findings after extracorporeal shock wave therapy (ESWT) for chronic plantar fasciitis. Methods The subjects were 23 feet of 23 patients of refractory plantar fasciitis. The mean age was 53.7 years. The thickness of the plantar fascia (PF) and findings of a high-signal intensity area (HSIA) inside the PF, edema around the PF, and bone marrow edema (BME) of the calcaneus were investigated on MR images. The Japanese Society for Surgery of the Foot (JSSF) ankle-hindfoot scale and a visual analogue scale (VAS) were used. Correlations between an improvement in symptoms and one in the MRI findings were analyzed. Results The mean thickness of the PF was 4.4 ± 1.6 mm before ESWT and 4.6 ± 1.8 mm six months after ESWT. After ESWT, there was a decrease in the numbers of feet showing HSIA inside the PF from 15 to 6, in edema around the PF from 16 to 2, and in BME of the calcaneus from 11 to 4. Clinical outcomes improved with ESWT from 70.3 ± 5.5 to 88.6 ± 9.1 points (JSSF), 74.1 ± 25.3 to 28.5 ± 24.4 points (VAS), respectively. Improvements in symptoms according to the JSSF and VAS scores and improvement in edema around the PF on MR images showed a significant correlation. Conclusions Edema around the PF improved significantly in association with an improvement in symptoms after ESWT.

Background The biomechanical abnormalities in patients with posterior tibial tendon dysfunction (PTTD) have been described, but few studies have investigated biomechanical chains of adjacent joints. Therefore, we examined the gait pattern of the lower extremity in subjects with PTTD, focusing on the hip and knee joints. Methods We compared 19 PTTD patients (average age: 67.1) with 30 age-matched control subjects (average age: 65.1). Gait analysis was performed with a nine-camera motion-capture system and four force plates, using the Vicon Plug-In-Gait and Vicon Nexus software. Temporal-spatial parameters were compared between PTTD and control subjects, and motion and ground reaction force data were compared between the affected limb, the contralateral limb, and the right limb in control subjects. Results Subjects with PTTD had increased stance phase ratio and decreased stride length, cadence, and gait speed. The limbs of subjects with PTTD showed increased knee internal rotation at lording response, which was biased to abduction in the knee joint during the gait cycle, and irregular hip flexion and knee extension moment in the terminal stance, even under control of gait speed. Significance We believe that the subjects with PTTD have an increased risk of knee osteoarthritis in both the affected and contralateral limbs.

BACKGROUND Ample evidence on etiological and pathological differences between femoral neck and trochanteric fracture cases suggests the possibility of individualized treatment. There are many issues related to areal bone mineral density and other quantitative computed tomography parameters of the proximal femur. Although osteoporosis is a systemic problem, little has been reported regarding differences in bone structural parameters, including bone mineral density, between them in regions other than the proximal femur. METHODS Participants were consecutive female patients >50 years of age admitted to the Saiseikai Suita Hospital (Osaka prefecture, Japan) for their first hip fracture between January 2012 and September 2014. Cortical thickness (CoTh, mm), volumetric trabecular bone mineral density (TBD, mg/cm3), and elastic modulus of trabecular bone (EMTb, GPa) were obtained as the new QUS parameters using the LD-100 system (Oyo Electric, Kyoto, Japan). The mean values of these parameters were compared between femoral neck and trochanteric fracture cases. In addition, correlations between age and each QUS parameter were investigated for each fracture type. A receiver operating characteristic (ROC) curve analysis was performed to examine the degree of effect each parameter on the fracture types. The area under the curve (AUC) for each parameter was compared to the AUC for age. RESULTS There were 63 cases of femoral neck fracture (mean age, 78.2 years) and 37 cases of trochanteric fracture (mean age, 85.9 years). Mean TBD and EMTb were significantly higher for femoral neck fractures. There were significant negative correlations between QUS parameters and age for femoral neck fractures (P < 0.005). The regression lines for femoral neck fractures were above those for trochanteric fractures for TBD and EMTb. AUCs were 0.72 for age, and 0.61, 0.65, and 0.65 for CoTh, TBD, and EMTb, respectively. CONCLUSIONS The new QUS parameters indicated that TR fracture cases were more osteoporotic than were FN fracture cases, even at the distal radius. There might be systemic differences between them, in addition to localized factors at the proximal femur.

BACKGROUND The incidence of femoral neck and trochanteric fractures reportedly differ by age and regionality. We investigated differences in monthly variations of the occurrence of femoral neck and trochanteric fractures as well as place and cause of injury in the Kyoto prefecture over a 6-year period. METHODS Fracture type (neck or trochanteric fracture), age, sex, place of injury, and cause of injury were surveyed among patients aged ≥ 65 years with hip fractures that occurred between 2008 and 2013 who were treated in 1 of 13 participating hospitals (5 in an urban area and 8 in a rural area). The proportion of sick beds in the participating hospitals was 24.7% (4,151/16,781). Monthly variations in the number of patients were investigated in urban and rural areas in addition to the entire Kyoto prefecture. Place of injury was classified as indoors or outdoors, and cause of injury was categorized as simple fall, accident, or uncertain. RESULTS There were 2,826 patients with neck fractures (mean age, 82.1 years) and 3,305 patients with trochanteric fractures (mean age, 85.0 years). There were similarities in the monthly variation of the number of fractures in addition to the place and cause of injury between neck and trochanteric fractures. Indoors (approximately 74%) and simple falls (approximately 78%) were the primary place and cause of injury, respectively. The place of injury was not significantly different by fracture type with each age group. Significantly more patients with neck fracture had "uncertain" as the cause of injury than trochanteric fracture in all age groups. CONCLUSIONS Based on the results of the present study, the injury pattern might not have a great effect on the susceptibility difference between neck and trochanteric fractures.

OBJECT There are reports that fusion is the standard treatment of choice for cases of lumbar degenerative spondylolisthesis (LDS) associated with lumbar spinal canal stenosis with a large degree of slippage. The reasons why, however, have not been clarified. On the other hand, it is known that the progress of slippage decreases and restabilization occurs over the natural course of LDS. Therefore, if minimally invasive decompression could be performed, there would be little possibility of it influencing the natural course of LDS, so it would not be necessary to include preoperative percentage slip in the criteria for the selection of fusion. This study examined the course of LDS cases more than 5 years after treatment with minimally invasive decompression to determine whether pre- and postoperative slippage and disc changes influence the clinical results. METHODS A total of 51 intervertebral segments in 51 cases with the chief complaint of radicular or cauda equina symptoms due to lumbar spinal canal stenosis were examined after prospective treatment with minimally invasive decompression for LDS. The mean age of the patients at the time of surgery was 66.7 years and the mean follow-up period was 7 years 4 months. Minimally invasive decompression was performed regardless of the degree of low-back pain or percentage slip. The outcome variables were clinical results and changes in imaging findings. RESULTS Over the follow-up period, postoperative percentage slip increased and disc height decreased, but the Japanese Orthopaedic Association score improved. Regardless of the preoperative percentage slip, disc height, or degree of intervertebral disc degeneration or segmental instability, the clinical results were favorable. In the high preoperative percentage slip group, low disc height group, and progressive disc degeneration group, there was little postoperative progress of slippage. In the group with a postoperative slippage increase of more than 5%, slippage increased significantly at postoperative year 2, but no significant difference was observed at the final follow-up. CONCLUSIONS When minimally invasive decompression was performed to treat LDS, the postoperative change in slippage was no different from that during the natural course. Furthermore, regardless of the degree of preoperative slippage or intervertebral disc degeneration, the clinical results were favorable. Also, the higher the preoperative percentage slip and the more that disc degeneration progressed, the more the progress of postoperative slippage decreased. Because the postoperative progress of slippage decreased, it is believed that even after minimally invasive decompression, restabilization occurs as it would during the natural course. If minimally invasive decompression can be performed to treat LDS, it is believed that preoperative percentage slip and intervertebral disc degeneration do not have to be included in the appropriateness criteria for fusion.

Introduction/Background The aim of this study was to reveal the relation between the neurogenetic change in the nonparalytic muscles in upper and lower limbs of Polio survivors and the later muscle strength decline. Material and method Retrospective study. We looked back the data of electromyography (EMG) of Polio survivors in our Polio clinic (average age: 58.9). Muscles whose strength at EMG had been normal were extracted. We looked up the muscle strength at EMG time and two years later from medical record. Results The subjects were 23 deltoid (middle strand), 40 biceps branchii, 36 triceps branchii, 24 vastus lateralis, 19 tibialis anterior, and gastrocnemius (medial head). The ratio of neurogenic change subject (giant spike or interference pattern reduction) was, 30.4%, 25.0%, 36.1%, 62.5%, 47.4%, and 73.7%, respectively. In neurogenic change group of Biceps, 50.0% showed decline in their muscle strength. In non-neurogenic change group of Deltoid, 25.0% showed decline in their muscle strength. Conclusion Present study suggested that some muscle strength decline may be caused by Post-polio syndrome (PPS), and that EMG might be the most useful tool for the risk detection of PPS, especially for Biceps branchii. On the other hand, the fact that 25% of Deltoid non-neurogenic change group showed muscle strength decline was not understood in this study. Pain or disuse from disorder in shoulder joint might possibly be as a cause.

Introduction/Background Exercise with a Balance Exercise Assist Robot (BEAR ex.) is reportedly effective for improving dynamic balance and muscle strength of lower extremities of patients with central nervous system disorder and frailty. The aim of this study was to examine the effect of this training using the BEAR for chronic myelopathy with balance disorder. Material and method This study was designed as a crossover trial. Participants were divided into group A and group B. The period is 4 weeks. Group A that is BEAR ex. 8 days in two weeks, then conducts conventional balance exercise (CON ex.) on 8 days in two weeks. Group B was in the reverse of the protocol of group A. Outcome measures: Berg balance scale (BBS), functional reach test (FRT), timed up and go test (TUG) and muscle strength of the lower extremities (hip flexion, knee extension, ankle dorsiflexion and plantar flexion) were assessed before and after of each exercise. After the exercise, each participant rated whether the exercises had been satisfied through a questionnaire. Comparison between changes before and after each exercise and changes in each exercise were used a paired t test. The level of significance was less than 5%. Results There were 18 participants(12 men, 6 women; age 71 ± 9 years; duration of morbidity 14 ± 13 years) who completed this study. Group A were 8 cases, Group B were 10 cases. FRT were increased with both exercise. BBS and muscle strength of hip flexion were increased with BEAR ex. Changes in each exercise was no significant difference in all measurements. The satisfaction of each exercise was 15 cases preferred BEAR ex. Conclusion In chronic myelopathy with balance disorders, the BEAR ex. showed the same improvement of dynamic balance as CON ex. Also it was excellent in maintaining motivation to practice.