Search

Level of Evidence: III., Competing Interests: Declaration of conflicting interestsThe authors declare no potential conflicts of interest with respect to the research, authorship, and publication of this article.

Purpose: The Thumb Grasp and Pinch Assessment (T-GAP) is a new instrument for evaluating thumb use in children with congenital hypoplastic thumbs. The assessors video-record the children while they perform nine specific activities and score their grasp types using T-GAP. A high T-GAP score indicates more mature grasp patterns. The developers reported the instrument's validity and reliability for index finger pollicization. This study investigated T-GAP's validity and reliability in children with reconstructed hypoplastic thumbs., Methods: Four hand surgeons and two hand therapists from two hospitals rated video clips of 20 Manske type II and IIIa hands twice in 17 patients who performed the T-GAP at least 1 year after opposition transfer and thumb ligament reconstruction. To investigate the validity, we calculated correlation coefficients for T-GAP scores and clinical outcomes, including thumb ROM, grip and pinch strength, and visual analog assessments of thumb function and appearance. To estimate T-GAP's inter- and intrarater reliability, we calculated intraclass correlation coefficients and their 95% confidence intervals (CIs)., Results: Thumb Grasp and Pinch Assessment score showed a strong linear correlation (r = 0.815-0.944) and a moderate to strong nonlinear correlation (ρ = 0.527-0.744) with visual analog scale assessments of thumb function and appearance, respectively; a moderate nonlinear correlation (ρ = 0.464) with grip strength; and a moderate nonlinear correlation (ρ = 0.541) with thumb MCP joint range of motion. The intraclass correlation coefficient for the interrater reliability was 0.892 (95% CI, 0.768-0.954) in round 1 and 0.898 (95% CI, 0.754-0.959) in round 2, and for intrarater reliability, the mean was 0.882 (95% CI, 0.785-0.980)., Conclusions: Thumb Grasp and Pinch Assessment score had a moderate to strong construct validity and a moderate concurrent validity. Both inter- and intrarater reliability was strong., Clinical Relevance: This study supports the T-GAP instrument's validity and reliability for assessing functional outcomes in congenital hypoplastic thumb reconstruction., (Copyright © 2024 American Society for Surgery of the Hand. Published by Elsevier Inc. All rights reserved.)

BACKGROUND Congenital hypoplasia of the thumb type IV, also known as floating thumb, is a condition in which 2 small phalanges are attached to the hand with a thin skin bridge. Surgical management options for this condition vary from amputation to flap reconstruction. MATERIAL AND METHODS This retrospective study analyzed 11 infants with congenital hypoplasia of the thumb type IV who underwent surgical reconstruction using a modified vascularized polydactylous hallux flap. The study included 6 male and 5 female infants, aged 6 to 24 months. Functional evaluations and radiographic studies were conducted postoperatively. RESULTS All 11 patients underwent the complete surgical protocol. Successful vascular and nerve anastomoses were performed during the initial procedure, ensuring sufficient blood supply and neural connectivity to the transferred toes. The second operation showed promising outcomes, including improvements in thumb opposition, grasp strength, and overall function. Postoperative assessments demonstrated satisfactory radiographic alignment and no major complications during the follow-up period. CONCLUSIONS The modified vascularized polydactylous hallux flap reconstruction is a viable surgical option for managing congenital hypoplasia of the thumb type IV in infants. This technique effectively restores thumb opposition, grasp strength, and overall hand function, with satisfactory radiographic alignment and minimal complications. The study findings support the efficacy and safety of this surgical approach in addressing this rare congenital anomaly.

Background: Surgical outcomes of duplicated thumbs differ depending on the branching type. The authors developed a new classification system and report surgical outcomes with an average 10.2-year follow-up., Methods: A total of 529 patients with 562 duplicated thumbs were reviewed. Surgical anatomies were compared with radiographs, and then a new classification system was developed based on branching level and bone shape observed on the radiograph: distal type (D-type), including Wassel types I and II; proximal type (P-type), including Wassel types Ⅲ and Ⅳ, and four subdivisions (Po, Pa, Pb, and Pc) according to bone structure; and metacarpal type (MC-type), including Wassel types V and VI. All hands were assessed using the Japanese Society for Surgery of the Hand evaluation form, and factors causing poor outcomes were analyzed., Results: There were 25% D-type, 59% P-type, and 14% MC-type hands; 2% of hands were not classified. Overall, 351 hands (63%) were directly assessed when patients reached 5 years of age. Seventeen percent of hands had fair results. Good results were achieved in 90% of D- and Po-type hands. Pa-, Pb-, Pc-, and MC-type hands had lower Japanese Society for Surgery of the Hand scores than did D- or Po-type hands. Pa- and Pb-type hands tended to develop interphalangeal joint malalignment and instability, whereas Pc- and MC-type hands developed disorders in the metacarpophalangeal joint with growth., Conclusions: The authors' new classification system clarifies the potential pitfalls for each type of duplicated thumb. More than 90% of D- and Po-type hands obtained good results. Care should be taken with interphalangeal joint reconstruction for Pa- and Pb-type hands. Meticulous reconstruction of the metacarpophalangeal joint is essential for Pc- and MC-type hands. This analysis provides important information for surgeons and patients., Clinical Question/level of Evidence: Risk, IV., (Copyright © 2023 The Authors. Published by Wolters Kluwer Health, Inc. on behalf of the American Society of Plastic Surgeons.)

Background: Historically, amputation and pollicization has been the recommended surgical treatment for Blauth type III hypoplastic thumbs. However, due to aesthetic objections or cultural preferences, some parents seek out alternative surgical options. The present study describes a nontraditional technique that preserves and augments the hypoplastic thumb., Methods: Patient charts were retrospectively reviewed to identify patients with Blauth type III hypoplastic thumbs who underwent thumb reconstruction at our institution from 2008 to 2018. The reconstruction procedure involved toe phalanx transfer, staged tendon transfers, and lengthening as needed. Motion was assessed categorically as ability to flex, extend, or oppose the thumb. Functionality was assessed as ability to pinch and grasp with the surgical hand. Patient- or parent-reported improvement in thumb function was also recorded., Results: Of the 13 patients, 100% could flex, extend, and oppose the thumb to some degree. Eleven patients (85%) had functional one-handed grasp, and 9 (69%) had a functional pinch. Eleven patients (85%) reported no functional limitations of the operative hand. Thirteen patients (100%) reported improvement in hand function after surgery as compared to pre-operatively. There were 2 minor complications (15%), both of which resolved after intervention. No patients experienced donor-site morbidity., Conclusions: Reconstruction of Blauth III thumbs is a nontraditional technique that allows for digit retention by salvaging the hypoplastic thumb. In the present study, the majority of patients had functional thumbs and all reported postoperative improvement. Overall, our results suggest that reconstruction is a viable surgical option for Blauth III hypoplastic thumbs.

Objective: This study aimed to introduce a minimally invasive technique in correcting residual zigzag deformities after early treatment of thumb duplication followed by fixation with a cemented frame., Methods: Nineteen patients (14 males, 5 females; mean age, 12 years; age range, 8-14 years) with residual zigzag thumb deformities were treated with the minimally invasive technique from 2017 to 2019. The function and cosmesis of the thumbs were assessed using the Japanese Society for Surgery of the Hand., Results: The mean period between the first and the second operations was 35 months (range, 12-84 months). There were Wassel types III (n=4), IV (n=13), and V (n=2) residual zigzag thumb deformities. Preoperatively, the mean alignment deformities of the interphalangeal and metacarpophalangeal joints were 23° (12-42°) and 18° (11-33°), respectively. The mean function and cosmesis of the thumbs were 12 points (range, 8-14 points). There were 1 fair and 18 poor scores. At the final follow-up (mean, 28 months; range, 24-33 months), the mean alignment deformities of the interphalangeal and metacarpophalangeal joints were 1° (0-4°) and 18° (0-4°), respectively. The mean function and cosmesis of the thumbs were 18 points (range, 16-20 points). There were 5 excellent results, 13 good results, and 1 fair result., Conclusion: Residual zigzag thumb deformities can be successfully corrected with the minimally invasive technique, resulting in good functional and cosmetic outcomes. The technique can be used as an alternative in selected cases., Level of Evidence: Level IV, Therapeutic Study.

Pollicization has been a very successful procedure in the treatment of specific types of hypoplastic thumb. Although much has remained the same since early descriptions of the procedure in the 1800s and 1900s, refinements over the years have made it safer and more predictable. Over the years at our institution we have studied, modified and refined our incisions to produce a new thumb that is aesthetically pleasing with excellent function. We present our technique for pollicization along with pearls and pitfalls we have discovered.

Objective: To investigate the effectiveness of soft tissue balance technique by flexor pollicis longus (FPL) tendon transfer for Wassel Ⅳ-D thumb duplication in children., Methods: A clinical data of 14 children with Wassel Ⅳ-D thumb duplication met the selection criteria between January 2017 and January 2021 was retrospectively analyzed. There were 5 boys and 9 girls with an average age of 21.6 months (range, 18-35 months). Ten cases were left hand deformity and 4 cases were right hand deformity. During operation, the radial thumb was excised, and the FPL tendon of the radial thumb was used to reconstruct the soft tissue balance of the ulnar thumb. Postoperative evaluation included the range of motion (ROM) of passive flexion and extension of the interphalangeal joint (IP) and metacarpophalangeal joint (MCP), the alignments of the IP and MCP, the percentage of the width of the nail plate and the circumference of the thumb at the level of the IP to contralateral thumb., Results: All operations were completed successfully, and all incisions healed by first intention. The children were followed up 12-36 months (mean, 21.7 months). At last follow-up, the ROM of passive flexion and the deviation of the IP, and the deviation of the MCP significantly improved when compared with those before operation ( P <0.05); the ROM of passive extension of the IP and the ROM of passive flexion of the MCP did not significantly improve when compared with those before operation ( P >0.05). The ROMs of passive extension of the MCP were 0° before and after operation. The width of the nail plate was 76.6%±4.1% of the unaffected side, and the circumference of the thumb at the level of the IP was 92.0%±9.1% of the unaffected side., Conclusion: The soft tissue balance technique by FPL tendon trasfer can effectively correct the alignment of the Wassel Ⅳ-D thumb duplication in children, and maintain the correction effect effectively, but further follow-up and comprehensive evaluation are needed to investigate the long-term effectiveness.

The aim of this study was to assess the clinical results after extensor indicis proprius opponensplasty in patients with carpal tunnel syndrome and severe thenar muscle atrophy. Forty patients who underwent this procedure during open carpal tunnel releases. The mean follow-up period was 17 months (range 10 to 36). Kapandji scores significantly improved from 5.5 before surgery to 9.6 at final follow-up. Thumb pronation angle also significantly improved from 111° before surgery to 149°. Side and pulp pinch strength significantly improved postoperatively, as well as DASH scores at final follow-up. In conclusion, the extensor indicis proprius tendon transfer technique represents a reliable opponensplasty procedure to achieve consistent results in patients with severe carpal tunnel syndrome. Level of evidence: IV.

This retrospective study analyses long-term outcomes of reconstruction for congenital thumb hypoplasia Grades 2 and 3 A. In 22 thumbs (mean follow-up 9 years), instability of the metacarpophalangeal joint was found in 20 thumbs regardless of the method of reconstruction, double breasting of local tissue with or without adductor pollicis advancement or use of a slip of flexor digitorum superficialis to supplement local tissue. There was a trend towards a greater global strength, higher Kapandji score and better subjective function score when the abductor digiti minimi was used as an opposition transfer as compared with the flexor digitorum superficialis. Results for motion and subjective parameters were consistent with comparable studies though these comparisons are compromised by different methods of classification and assessment. Consistent application of an expanded Blauth grading system and a formal hypoplastic thumb score will improve the ability to compare pre- and postoperative status, different techniques and results from different centres. Level of evidence: IV.

Background: Deformities of the hands occur in most patients with recessive dystrophic epidermolysis bullosa. All structures of the hand may be involved. To restore hand function, it is necessary to identify the proper method of treatment., Patients and Methods: We conducted a retrospective review of 18 patients for a total of 30 surgically treated hands. The data were collected between 1998 and 2016 at Hôpital Necker Enfants Malades (Paris, France) and Institut de la Main (Paris, France). The postoperative follow-up period ranged between 22 months and 168 months, with an average duration of 76 months. The procedure performed on all of these patients involved a first web release for the thumb and pseudosyndactyly release for the remaining digits. A full thickness skin graft was used at the level of the first commissure and palm of the hand, while acellular dermal substitutes (Integra® or Matriderm®) were used to cover the remaining commissures, digits, and the remainder of the hand, followed by a split thickness skin graft. Postoperative rehabilitation ensued., Results: Long-term results are encouraging, demonstrating maintenance of function greater than 3 years in 57% of cases, and greater than 5 years in 33% of cases., Conclusion: We believe that good surgical technique followed by good rehabilitation, combined with an interdisciplinary overall management of these patients, allowed us to succeed in maintaining a very satisfactory, esthetic, and functional result exceeding 5 years for one-third of patients. The resultant psychological benefit is very important., Competing Interests: Declaration of Competing Interest None declared., (Copyright © 2021 British Association of Plastic, Reconstructive and Aesthetic Surgeons. Published by Elsevier Ltd. All rights reserved.)

Background: Pollicization of the index finger can be considered the gold standard technique for the treatment of congenital thumb aplasia. The aim of this study was to review the described incisions for pollicization and to create an anatomical framework enabling the study and comparison of these incisions., Methods: A systematic review was performed to collect descriptions of incision sets. An anatomical model was created from the two upper limbs of the same cadaver. Thumb aplasia was modeled on both hands of this cadaver by severing the thumbs; an index finger pollicization was performed on one of the two hands. Comparative analysis of scar positions, first web size, and neothumb aspect of each incision set was conducted using a surgical glove modeling the skin. The glove was fitted onto the aplastic model to draw the incisions and then onto the pollicized hand to adjust the resulting flaps after cutting., Results: Twelve articles, two textbooks, and one DVD were included in the review, either containing an original description of incisions, or describing an incision pattern with figures and references to the initial author. A total of five different incision sets, described by Buck-Gramcko, Blauth, Foucher, Ezaki, and Malek, were identified and compared using the anatomical model., Conclusions: This work summarizes five original incisions described for index pollicization in thumb aplasia and presents a standardized and reliable model to study and compare these different sets. The model can be used for educational purposes, either to teach or to optimize an incision set., (Copyright © 2021 by the American Society of Plastic Surgeons.)

Background: Surgical correction of ulnar drift of metacarpo-phalangeal joint (MPJ) due to Rheumatoid arthritis (RA) is conventionally done by silicon joint arthroplasty which is expensive and may be associated with many complications. We report the outcome of low-cost autologous interpositional arthroplasty., Material and Methods: Five patients (8 hands, 32 arthroplasties) underwent correction of ulnar drift of MPJ by dorsal capsule interpositional arthroplasty. Results were assessed according to the degree of recovery of movement at the MPJ and correction of ulnar drift. Functional improvement was graded as excellent, good and fair. Pain alleviation was assessed by visual analogue score (VAS) score., Results: Excellent results were seen in 3 patients (5 hands, 20 arthroplasties), good in 1 patient (2 hands, 8 arthroplasties) and fair in 1 patient (1 hand, 4 arthroplasties). VAS score for pain decreased from mean preoperative 8.2/10 to 1/10. On average follow up of 1.4 years there was good hand function, no recurrence of deformities and patients were pain free., Conclusion: Interpositional arthroplasty for MPJ using dorsal capsule for correction of post RA ulnar drift is a low-cost option which improves the hand function and cosmesis. Additionally, it avoids all the complications related with the use of silicon joints.

We present the MRI findings for 39 Wassel Type IV duplicated thumbs in 38 patients. We found that MRI revealed the morphology of the cartilaginous connection between the thumb anlages and the location of the deviation corresponding to the classification of Horii, which allowed precise preoperative planning of corrective osteotomies. All 39 thumbs were available for follow-up after surgical reconstruction at a mean of 29 months (range 25 to 39). Four out of nine Horii Type A cases and all 12 Type B, as well as the six Type C and the six Type D cases, achieved good results according to the Tada scoring system. Five Type A cases achieved fair results with residual stiffness of the interphalangeal joint. No secondary operations were needed. We conclude that MRI proved useful in subclassifying Wassel Type IV duplicated thumbs and may aid in planning the osteotomies needed for their reconstruction. Level of evidence: IV.

The traditional management of Manske 3B and 4 thumbs is index finger pollicization. Recently, the transfer of composite tissues from the foot to reconstruct the thumb or the carpometacarpal joint has allowed the preservation of a five-digit hand. Concerns remained about the donor site and also the limited functional and cosmetic outcomes that could be achieved. This article challenges the existing dogma in the management of hypoplastic thumbs, that pollicization should always be the reference standard. We describe the evolution of techniques with free vascularized metatarsal transfer, our refinements and our proposal for a new classification system that accommodates these modifications. With increased experience, acceptable outcomes that are comparable with pollicization can be achieved.

Purpose: The purpose of this study was to evaluate surgical outcomes of thumb preservation surgery for Blauth type IIIB hypoplastic thumbs using a nonvascularized toe phalanx to reconstruct the carpometacarpal joint., Methods: We reviewed the records of 12 patients with Blauth type IIIB thumb hypoplasia who underwent nonvascularized toe proximal phalanx transfer from the fourth toe. Stability and mobility of the thumb, lateral pinch power, and the percentage of the thumb length relative to the index finger proximal phalanx were evaluated. Outcomes were also assessed with the Functional Dexterity Test, a visual analog scale for daily use of the operated thumb, and for overall functional and appearance satisfaction of the parents., Results: Age at operation ranged from 0.9 to 11 years (mean, 3.0 years; median, 1.5 years). The mean follow-up period was 7.6 years (minimum, 3 years). Secondary reconstruction was planned in all 12 patients, but 2 families did not desire a second surgery. Secondary reconstruction consisted of tendon transfer for opposition, adduction, and/or extension of the reconstructed thumb and/or realignment surgery of the thumb axis by arthrodesis or corrective osteotomy. Eleven patients had good carpometacarpal joint stability. Thumb opposition was possible to the little finger in 7, to the middle finger in 3, and not possible in 2 patients. The mean lateral pinch strength was 18% of the contralateral normal side. The relative length of the thumb was 57% of the index finger. Time in seconds to complete Functional Dexterity Test was 83 seconds in the affected side and 38 seconds for the contralateral side. The visual analog scale suggested parental satisfaction for both the appearance and the function. The parents felt that their child used the reconstructed thumb more frequently when manipulating large objects than when manipulating small objects., Conclusions: Nonvascularized toe phalanx transfer is a useful procedure to preserve the thumb in Blauth type IIIB thumb hypoplasia. It provides a mobile, stable thumb that is functionally useful for the child and satisfying for the family., Type of Study/level of Evidence: Therapeutic IV., (Copyright © 2021 American Society for Surgery of the Hand. Published by Elsevier Inc. All rights reserved.)

Summary: Pollicization can be performed for secondary thumb reconstruction after traumatic injury or for primary thumb construction in cases of congenital thumb hypoplasia. Given the complexity of this operation, intimate familiarity with the involved anatomy and surgical principles is key to successful surgical outcomes. In this Video Plus article, the authors present a step-by-step approach to pollicization in case of Blauth type IIIB thumb hypoplasia., (Copyright © 2020 by the American Society of Plastic Surgeons.)

Pollicization of the index finger allows to reconstruct the hand's ability to pinch and grasp. It has been broadly used to address traumatic loss of the thumb. Today it is the procedure of choice for severe congenital thumb hypoplasia. It allows children prehension of small and large objects and gives the hand a more normal appearance. This is a demanding technique with well-defined and perfected steps that, if carefully performed, can minimize complications., Competing Interests: Conflicts of Interest and Source of Funding: The authors report no conflicts of interest and no source of funding., (Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.)

We examined the anatomical and clinical results of a new wrist subphyseal arthrodesis method called chondrodesis, which relies on resorbable suture-bone fixation for children with severe paralytic hand deformities and does not require fixation devices or bone grafting. Four children's wrists underwent the procedure, resulting in three successful wrist bone fusions. The wrists were stabilized by joint fusion in 4-5 months in good positions, ranging from neutral to extension 15°, while still allowing the forearm to keep growing since the radial growth plate remained open as of the last follow-up. The procedure improved hand function (House score, Raimondi score) and appearance. It also increased control over gripping motions with the operated hand, and even restored key pinch ability in one of the patients. The youngest patient was not able to achieve bone fusion at the key sites and will need further corrective procedures at a later and more optimal age. This novel procedure is appealing because of its technical reproducibility, low cost, encouraging outcomes, ease of rehabilitation, and because it spares the physeal cartilage., (Copyright © 2020 SFCM. Published by Elsevier Masson SAS. All rights reserved.)

We treated 16 patients with 17 hypoplastic thumbs (eight Type IIIB and nine Type IV) using a non-vascularized fourth metatarsal transfer with a rotational flap and multi-staged reconstruction. The average age at the first operation was 24 months. The average follow-up time was 46 months. All patients achieved reasonable hand function and were able to use the reconstructed thumb to grip small and large objects. The operated thumb achieved an average Kapandji score of 6.7 and average pinch strength of 0.9 kg. There were two cases of graft nonunion. All parents are satisfied with the function and appearance of the reconstructed thumb and donor foot. We conclude that non-vascularized fourth metatarsal transfer is a feasible reconstruction method for patients with Types IIIB and IV hypoplastic thumbs. The reconstruction allows for the preservation of a 5-digit hand with reasonable function and appearance and minimal donor site morbidity, although long-term growth of the metatarsals still need to be monitored. Level of evidence: IV.

The functional dexterity test (FDT) is a timed pegboard test based on the manipulation of each peg and suitable for young children as it is both simple and quick to perform. We assessed the postoperative FDT values for children with Blauth type 2 hypoplastic thumbs after opponensplasty. We evaluated hand function using FDT for 12 hands of 11 patients with Blauth type 2 hypoplastic thumbs. Opponensplasty was performed in all hands following by Huber's procedure. All patients were evaluated from 6 to 12 months after surgery for hand function using three types of FDT scores: time in seconds to complete the test (FDT time), combined total time with penalty seconds added to the initial time (FDT total), and the number of pegs per second to complete the task as a percentage against normative values (FDT speed). We compared the postoperative FDT scores with those for Blauth type 1 or 2 hypoplastic thumb patients without surgical treatment. FDT time and FDT total for the patients postoperatively were both significantly shorter than those in the type 2 patients without surgical treatment. FDT speed was significantly higher than that for the patients without surgical treatment. There were no significant differences in the three FDT scores between the postoperative patients and the type 1 patients. There were several limitations including small sample size, large ranges of the data, and high number of variables. FDT reflected postopponensplasty improvement in hand dexterity in young children with Blauth type 2 hypoplastic thumb.

Introduction: Pollicization of the index finger as a treatment for aplasia and severe congenital thumb hypoplasia remains a demanding surgical procedure. In aplasias, it is generally well-accepted, less in hypoplasias. However, it is often the only solution to give back to the child the possibilities of a pollici-digital grip, guaranteeing an excellent function of the hand. We decided to evaluate the long-term results of this intervention., Material and Methods: We reviewed all children operated of index pollicization for a congenital aplasia or hypoplasia of the thumb between 2006 and 2018. The evaluation was performed with a specialized reeducator. The analytical and functional characteristics of the neo-thumbs were evaluated, as well as the consequences on the daily life of the child., Results: Thirteen pollicisations were performed on 10 patients. The mean age at surgery was 21 months (10; 43). It was a Blauth stage IIIB in 1 case, IV in 5 cases, and V in 7 cases. Seven children, and eight hands, could be evaluated. The average postoperative follow-up was 6.5 years. The mean age at the examination was 7.7 years (3.3, 12.1). The mean Percival score was 18 out of 22. The adapted video-assisted scoring system had an average score of 11 out of 14. Children described a momentary psychosocial discomfort for 5 of them, and still present in 3 of them., Conclusion: The pollicization of the index finger in congenital aplasia or severe hypoplasia (stage IIIB and IV) of the thumb remains for us the only way to create a sensitive thumb, mobile, with satisfactory strength and appearance, and to bring a normal function of the hand. The evaluation of our functional results are good to very good in the majority of patients, and show the benefits give by this intervention., (Copyright © 2019 Elsevier Masson SAS. All rights reserved.)

This study evaluates the long-term results of pollicization for a congenitally absent or severely hypoplastic thumb. Twenty-nine patients with 34 pollicizations were divided to two groups: those with simple thumb hypoplasia (22 pollicizations) and those with radial longitudinal dysplasia (12 pollicizations). The patients were followed from 1.3 to 32 years, with a mean follow-up time of 11 years. The patients were examined clinically and radiologically, and they completed a questionnaire concerning satisfaction with appearance, function, and social interaction. The Percival score was also calculated. In both groups, grip and pinch strengths of the operated hands were inferior to the normative age-related values. Radiologically, flattening of the original metacarpal head was found in 20 out of the 34 operated hands. We found better patient satisfaction in the simple hypoplasia group than in the radial longitudinal dysplasia group. The functional outcomes and patients' satisfaction did not correlate with the age of patients at operation. Level of evidence: IV.

Background: The predominant method for Manske type IIIB and IV thumb hypoplasia is pollicization. However, for those who are not willing to sacrifice the index finger, a method that could reconstruct a functionally capable and aesthetically acceptable thumb remains desirable. This study aimed to investigate and assess the functional and radiographic outcomes of utilizing a reversed vascularized second metatarsal composite flap for thumb reconstruction as a new alternative., Methods: From May 2014 to January 2017, 15 patients with Manske type IIIB or IV thumb hypoplasia who were admitted to the Department of Hand Surgery, Beijing Jishuitan Hospital were included in this study. An osteocutaneous flap containing a section of second metatarsal and its distal head was transferred in reversed position to reconstruct carpometacarpal joint. The donor site was reconstructed by a split half of the third metatarsal. Various functional reconstructions were commenced at second stage. The reconstructed thumbs were evaluated using the Kapandji score, pinch force, and the capacities of performing daily activities through a detailed questionnaire., Results: Among these 15 patients (seven type IIIB and eight type IV), there were ten boys and five girls with median age of 4.2 years (range: 2.0-7.0 years). There were seven right, three left, and five bilateral thumbs for whom only the right thumb received surgery. There were 14 metatarsal flaps survived (14/15). With an average follow-up of 19.2 months, the reconstructed thumbs had acceptable functional and aesthetic outcomes and the donor foot presented in decent appearance without signs of impaired function. All 15 children have improved the Kapandji score (from 0 to an average of 6.7), pinch force (from 0 to an average of 1.5 kg), with ability of grip and pen holding. X-ray indicated continuous bone growth. Patients and parents had good acceptance of the new thumb., Conclusions: Reconstruction of an unstable hypoplastic thumb (Manske type IIIB and IV) with use of a vascularized metatarsal is an effective strategy. It offers an alternative solution for parents insisting on saving the thumb.

Background and Objectives: Congenital thumb hypoplasia is a rare deformity of upper extremity. The incidence for thumb hypoplasia grade II-V is 1:10,000 newborns per year in Latvia. A technique for extensor indicis proprius (EIP) tendon transfer with subperiosteal fixation was developed and used for thumb hypoplasia grades II and IIIa. Pollicization or second-toe-to-hand transplantation with metatarsophalangeal (MTP) joint arthrodesis was used for the reconstruction of hypoplasia grade IIIb-V. The aim of this retrospective cohort study is to evaluate the outcomes for reconstruction techniques used in one surgical center during a ten-year period by one surgeon to evaluate functional and aesthetical outcomes for new techniques., Materials and Methods: In total, 21 patients were operated on during 2007-2017, and 18 of these patients were involved in this study. Long-term follow-up was completed to evaluate the functions and aesthetics of the hands., Results: disabilities of the arm, shoulder and hand (DASH) was 9.35 (8-10.7) for the second-toe-to-hand with MTP joint arthrodesis transplantation method for pollicization method 19.8 (6-26.7), and for the EIP tendon transposition, 14.54 (0.9-56.3)., Conclusions: The postoperative functional parameters of congenital hand hypoplasia patients, regardless of the surgical method, are worse than the functional results of healthy patients . The use of the second-toe-to-hand with MTP joint arthrodesis transplantation method provides patients with congenital hand IIIb-V hypoplasia a stable and functional first finger formation. The functional results are comparable to the clinical results of the pollicization method while ensuring the creation of a five-digit hand., Competing Interests: The authors have declared no potential conflicts of interests regarding research, authorship, and/or publication of this article.

Purpose: The Thumb Grasp and Pinch (T-GAP) assessment quantifies functional hand use in children with congenital thumb hypoplasia by categorizing grasp and thumb use patterns during assessment activities that encourage a variety of grasp and pinch styles. This study aims to demonstrate interrater and intrarater reliability results of the T-GAP., Methods: A retrospective review was performed of children who had undergone index finger pollicization for congenital thumb hypoplasia and subsequent evaluation with videotaping of the T-GAP assessment. Following a training period, 4 occupational therapists scored 11 T-GAP videos on 2 separate occasions, separated by at least 2 weeks. Intraclass correlation coefficients (ICCs), standard error of measurements, minimum detectable change (MDC), and Pearson correlation coefficients were calculated., Results: The T-GAP raw scores were 16 to 55, demonstrating a range of mild to severe hand grasp differences. The ICCs for the interrater reliability trials were 0.887 and 0.901. Intrarater ICCs were all above 0.88. The MDC for each trial was 8.1 and 6.7 points. Pearson correlation coefficients calculated for each rater and each pair of raters were above 0.8 in all cases., Conclusions: Interrater and intrarater reliability testing results for the T-GAP were excellent in all cases; this strongly suggests that results from T-GAP assessments are reliable. The high ICCs suggest that raters can classify and score children's hand function consistently., Clinical Relevance: This study, in conjunction with previous work, suggests that the T-GAP may be an ideal approach to assessing the outcomes of pollicization and provide a means of ongoing assessment of children's grip and pinch function., (Copyright © 2019 American Society for Surgery of the Hand. Published by Elsevier Inc. All rights reserved.)

Competing Interests: Competing interestsThe BMJ has judged that there are no disqualifying financial ties to commercial companies. The authors declare the following other interests: none. Further details of The BMJ policy on financial interests is here: https://www.bmj.com/about-bmj/resources-authors/forms-policies-and-checklists/declaration-competing-interests

Carpometacarpal (CMC) joint dislocation other than thumb are rare injuries and can be easily missed. These injuries account for <1% of all hand injuries and are frequently overlooked or missed. CMC dislocations can occur either in dorsal or volar direction and be associated with fractures. However, dorsal dislocation is more commonly encountered than volar dislocation. Volar CMC joint dislocations are rare and need a high level of suspicion for diagnosing and prevention of complications. We present a 36-year-old woman with post-traumatic neglected volar dislocation of all the five CMC joints leading to a windswept deformity of the hand., Competing Interests: Competing interests: None declared., (© BMJ Publishing Group Limited 2019. No commercial re-use. See rights and permissions. Published by BMJ.)

Purpose: To evaluate nail appearance after nail fusion plasty to treat thumb duplication., Methods: A modified form of nail fusion plasty was performed on 17 reconstructed thumbs of 16 children with thumb duplications, commencing in January 2010. We assessed nail width and nail, lunular, and nail fold deformities using the Wang-Gao scoring system. All 17 thumbs were evaluated over an average of 32 months (range, 12-48 months) of follow-up., Results: One patient with bilateral thumb deformities was excluded. The width ratios of 15 reconstructed nails (compared with those of the contralateral thumbs) were 82-118% (average, 97%). Nine thumbs exhibited nail ridges or gaps; the average ridge/gap score was 1.23 (maximum, 2). Six thumbs exhibited lunular deformities; the average score was 1.58 (maximum, 2). Another six thumbs evidenced nail fold deformities; the average score was 1.64 (maximum, 2). Only one thumb exhibited nail dehiscence. Two thumbs had no nail deformity. The final assessments were excellent in 14 cases, good in 2 cases, and fair in 1 case., Conclusions: We could not significantly reduce the deformity rate of the nail plate, nail fold, or lunula using our new technique, but the deformities were much less marked than previously. Nail fusion plasty usefully enlarges the nail and pulp in patients with hypoplastically duplicated thumbs., (Copyright © 2019 British Association of Plastic, Reconstructive and Aesthetic Surgeons. Published by Elsevier Ltd. All rights reserved.)

Objective: To explore the effectiveness of one-stage metacarpal osteotomy, thumb opponensplasty and polygonal flap reconstruction in the treatment of congenital spade hand deformity., Methods: Eight cases of congenital spade hand were treated between January 2013 and March 2017. There were 5 males and 3 females, with an average age of 17.5 months (range, 13-35 months). The clinical manifestations of all the children were congenital spade hand and the affected hand was shorter than the healthy side. The contralateral hand was normal and there was no chest, skull, or facial deformity. The operation was performed with metacarpal osteotomy and thumb opponensplasty, and through the dorsal metacarpal rectangular flap to reconstruct the first web and through rotation of polygonal skin flap to reconstruct thumb web and lateral fold of thumb index nail. The dorsal ulnar and proximal radial segment of thumb were repaired by skin grafting. A vernier caliper was used to measure the first web space and the thumb function was evaluated by modified Tada score., Results: The reconstruction of palmar function and the formation of first web were completed in one stage in 8 children. Skin grafting on the dorsal ulnar side of thumb and radial side of index finger survived after operation. All the children were followed up 13-29 months, with an average of 16.1 months. There was no infection, skin flap necrosis, lateral deviation of thumb, scar contracture, or other complications. At last follow-up, there was no significant difference in skin color between the healthy side and the first web of the affected hand. The opening distance of first web space was 3.5-5.0 cm, with an average of 4.2 cm. According to the modified Tada scoring system, the results were excellent in 7 cases and good in 1 case, with an excellent and good rate of 100%. The thumb could grasp and pinch actively, and the palm opposition function was good., Conclusion: One-stage thumb opponensplasty combined with polygonal flap for reconstruction of congenital spade hand deformity can improve hand function very well. The reasonable designing of skin flap can effectively cover important areas, and the operation is safe and reliable.

The reconstruction of a congenital hypoplastic thumb usually involves release of a tight first web space, metacarpophalangeal joint stabilization, reconstruction of intrinsic muscle function, and extrinsic tendon reconstruction, as appropriate. Numerous surgical options and combinations are available, but the approaches vary among surgeons who work in the field of congenital hand surgery and the empirical evidence that allows for evaluation of the results of techniques is scarce. Both the pre-operative assessment and intra-operative findings of all thumb elements - bone, joints, and soft tissues - should be considered in the surgical decision-making and eventually define the methods of reconstruction. This article summarizes the different reconstructive options.

Purpose: We aimed to detect whether percutaneous arthrography can provide detailed information for surgery for Wassel type IV thumb duplication prior to skin incision., Methods: Percutaneous arthrography of the metacarpophalangeal (MP) joints was performed in eight infants. Of these, three patients had interphalangeal (IP) joints, in which thumb duplication at the MP joint (Wassel type IV) was detected on radiography. Based on the arthrographic findings, we designed the skin incision and determined whether and where osteotomies were required to correct the angular deformities before surgery., Results: Arthrography revealed the cartilaginous position and shape, shown as a black area on radiographs. Two patients demonstrated fibrous attachment between the proximal phalanx of the radial thumb and the capsule of the ulnar thumb. One patient had two completely separated MP joints. Cartilaginous connection between the two proximal phalanges was present in another two cases. The remaining three patients demonstrated a common joint between the duplicated proximal phalanges, sharing a common articular space with the MP joint, with the metacarpal head's surface forming two facets separated by a crease in the middle. IP joint arthrography was performed in three patients who presented with angular deformity., Conclusions: Percutaneous arthrography can provide detailed information prior to skin incision. Furthermore, our arthrographic findings coincided with the practical situations we observed intraoperatively. Our experience indicates that preoperative percutaneous arthrography should be performed routinely in more cases and classified based on articular configuration to aid in the selection of surgical treatment., (Copyright © 2018. Published by Elsevier Ltd.)

Background: Hand injuries are very common in sports, such as skiing and ball sports. One of the major reasons causing hand and finger deformity is due to ligament and tendon injury. The aim of this study was to investigate if the high-resolution 3T magnetic resonance imaging (MRI) can demonstrate the complex anatomy of the fingers and thumb, especially the tendons and ligaments, and provide the accurate diagnosis of clinically important fingers and thumbs deformity due to ligamentous and tendinous injuries during sport activities., Methods: Sixteen fresh un-embalmed cadaveric hands were harvested from eight cadavers. A total of 20 healthy volunteers' hands and 44 patients with fingers or thumb deformity due to sports-related injuries were included in this study. All subjects had MR examination with T1-weighted images and proton density-weighted imaging with fat suppression (PD FS) in axial, coronal, and sagittal plane, respectively. Subsequently, all 16 cadaveric hands were sliced into 2-mm thick slab with a band saw (six in coronal plane, six in sagittal plane, and four in axial plane). The correlation of anatomic sections and the MRI characteristics of tendons of fingers and the ulnar collateral ligament (UCL) at the metacarpal phalangeal joint (MCPJ) of thumb between 20 healthy volunteers and 44 patients (confirmed by surgery) were analyzed., Results: The normal ligaments and tendons in 16 cadaveric hands and 20 volunteers' hands showed uniform low-signal intensity on all the sequences of the MRI. Among 44 patients with tendinous and ligamentous injuries in the fingers or thumb, 12 cases with UCL injury at MCPJ of the thumb (Stener lesion = 8 and non-Stener lesion = 4), 6 cases with the central slip injury, 12 cases with terminal tendon injury, and 14 cases with flexor digitorum profundus injury. The ligaments and tendons disruption manifested as increased signal intensity and poor definition, discontinuity, and heterogeneous signal intensity of the involved ligaments and tendons., Conclusions: Sports injury-related fingers and thumb deformity are relatively common. MRI is an accurate method for evaluation of the anatomy and pathologic conditions of the fingers and thumb. It is a useful tool for accurate diagnosis of the sports-related ligaments and tendons injuries in hand., Competing Interests: There are no conflicts of interest

Purpose: We aimed to compare the clinical results and the complications between the minimally invasive modified Camitz opponensplasty and the conventional Camitz opponensplasty for severe carpal tunnel syndrome (CTS), and to evaluate the efficacy of the modified technique for CTS., Methods: Twenty-eight hands in 24 patients with severe CTS who had disorder of the thumb opposition with thenar muscle atrophy (group 1) were treated by minimally invasive modified Camitz opponensplasty, passing the transferred palmaris longus (PL) tendon under the abductor pollicis brevis (APB) fascia using only palm and thumb incision, and no incision to either wrist crease or forearm. Ten hands in 10 patients (group 2) were treated by the conventional Camitz opponensplasty. Clinical evaluation was made by comparing the results before and after surgery for the angle of the thumb palmar abduction, pinch power, and grip strength., Results: All clinical findings significantly improved after surgery compared with before surgery in all patients. In group 1, there were no complications including transferred tendon bowstring, painful wrist scar, or injury to the palmar cutaneous branch of the median nerve in all hands. Conversely, patients in group 2 had four painful wrist scars and nine bowstrings of the transferred tendon., Conclusions: Several complications have been considered to attribute to the long incision and an extensive dissection crossing the wrist crease from the palm to the wrist in the conventional Camitz procedure. The current modified Camitz opponensplasty by minimally invasive incision without straddling the wrist crease is a simple and effective procedure that can decrease the risk of painful scar around the wrist crease in severe CTS patients with disorder of thumb opposition. Additionally, this technique, by passing the transferred PL tendon under the APB fascia, is useful in restoring the thumb opposition immediately, and in preventing the bowstringing of the transferred tendon.

Purpose: The aim of the study was to explore patients' long-term experience of a congenital hand problem, and the consequences for daily life., Method: Fifteen participants with a median age 24 years (17-55 years), born with thumb hypoplasia/aplasia or thumb duplication were interviewed using a semi-structured interview guide. The interviews were subjected to qualitative content analysis., Results: Although the mobility and strength in the thumb/hand(s) varied within the group, hand function was generally described as good. Compensatory strategies were used to overcome practical obstacles. The emotional reactions to being visibly different from peers in early life varied from total acceptance and a sense of pride in being special, to deep distress and social withdrawal. Support from parents, teachers and others was important in facing emotional challenges and practical consequences., Conclusion: The present study highlights the importance of healthcare professionals addressing appearance-related concerns which may have long-term emotional and social consequences for patients born with a thumb anomaly. Implications for Rehabilitation Appearance-related concerns and need for emotional support should be fully considered throughout the rehabilitation process to prevent distress and social withdrawal. Effective problem-solving strategies, such as compensation, change in occupational performance and support from others may reduce activity limitations and participation restriction.

Purpose: This study was conducted to report the functional outcomes of the Huber opposition transfer (abductor digiti minimi muscle) in types II and IIIA hypoplastic thumbs., Methods: Patients who had undergone a Huber opposition transfer with at least 5 years of follow-up were included in this study. There were 21 thumbs included; 12 returned for a detailed evaluation and 9 were included with a medical record review. Outcome measures included range of motion and pinch strength; Pediatric Outcomes Data Collection Instrument (PODCI) and Patient-Reported Outcomes Measurement Information System (PROMIS) scores were collected on those who could return. There were 15 type II and 6 type IIIA thumbs., Results: Range of motion was significantly less than normal for both the interphalangeal and the metacarpophalangeal joints. For the returning cohort, key and tripod pinch were 44% and 65% of normal. The median Kapandji score was 9 (range, 6-10). The PODCI scores were high for global, upper extremity function, happiness, and pain. The PROMIS scores were similar to normal, except for parent reports of physical function. For all included patients, there was a revision surgery rate of 22%, primarily related to persistent instability., Conclusions: At a minimum 5-year follow-up, the Huber opposition transfer for types II and IIIA thumbs was shown to provide good subjective outcomes, despite limited range of motion and strength., Type of Study/level of Evidence: Therapeutic IV., (Copyright © 2017 American Society for Surgery of the Hand. Published by Elsevier Inc. All rights reserved.)

Objective: To investigate the feasibility of one-stage thinning of latissimus dorsi muscle, rectus abdominis muscle and gracilis flap in reconstruction of the hand and foot defects., Methods: From June 2009 to April 2015,24 free muscle flaps were thinned during transfer operation by removing their superficial muscle layers on the basis of their vessel pedicles running in the deep surface of flaps. The surface of the muscle flaps were covered by split-thickness skin grafts. There were 16 latissimus dorsi muscle flaps,4 gracilis flaps and 4 rectus abdominis muscle flaps. Flap size ranged from 6 cm × 4 cm to 20 cm × 12 cm. Thinned muscle flaps were used to resurface 7 hand defects and 17 foot defects., Results: All muscle flaps survived the thinning procedures without any circulation problems except for one case which suffered total flap necrosis due to venous thrombosis. Skins grafts on muscle flaps also took well. One patient experienced partial skin loss. Two patients underwent secondary debridement and thinning procedure for infection and bulkiness. During the 0.3-20 months follow-up, the contour of thinned muscle flaps matched well with the recipient areas. Reconstructed feet are able to wear regular shoes., Conclusions: Intraoperative immediate thinning of free muscle flaps can be safely accomplished during the primary reconstruction procedure. This procedure prevents the limitations of muscle flap bulkiness and may provide an alternative for surface coverage.

Objective: To study the effectiveness of surgical treatment of congenital type V thumb syndactyly., Methods: Between March 2010 and May 2015, 12 cases of congenital type V thumb syndactyly were treated. There were 7 males and 5 females, aged from 1 to 25 years (mean, 8 years). The right thumb was involved in 8 cases, and the left thumb in 4 cases. There were 2 cases of radial type, and 10 cases of ulnar type. The basement of polydactylism was far away from the carpometacarpal joint in 7 cases, and was close to the carpometacarpal joint in 5 cases (slight ulnar deviation in 1 case). X-ray films showed that the main first thumb metacarpal bone and trapezium fitted well, and 2 cases had the first metacarpal bone deformity. Preoperative individualized treatment plan was made, and polydactylism was excised by the "S" or "Z" incision and simultaneous reconstruction of thenar muscle insertions or adductor muscle insertions was performed; if necessary, wedge osteotomy was used for correction., Results: All incisions healed by first intention with no complication. All cases were followed up 6 to 24 months (mean, 12 months). The thumb appearance, flexion and extension, the function of opposition, abduction function were improved significantly in 11 cases with no scar contracture deformity, small first web space, and deviation deformity. One case had slightly narrow first web space. According to hand function criterion, the results were excellent in 10 cases, good in 1 case, poor in 1 case; excellent and good rate was 91.7%., Conclusions: Based on the condition of the type V thumb syndactyly, the individualized treatment plan is made, which can better restore the shape and function of the thumb.

Objective: To investigate the necessity and feasibility of digit fusion with an advanced island flap in thumb dysplasia of radial polydactyly., Methods: From February 2007 to January 2015,we collected the patients with radial polydactyly, whose nail width or thumb girth was less than 80％ of contralateral side. Among them, some patients were also associated with radial deviation deformities in two thumbs or a shorter radial thumb compared with ulnar thumb. In these cases, an island compound flap, which was based on proper palmar digital artery (PPDA) in radial thumb and contained nail, part distal phalanx and skin, combining with ulnar side of ulnar thumb was used to reconstruct a new thumb. Only the patients with a smaller thumb girth were treated by an island flap to augment the thumb size. There were 26 patients, including 29 sides.Preoperative Doppler ultrasonic examination was assigned to observe the amount and distribution of princepspollicisartery(PPA) and PPDA. Appearances were evaluated by Wang -Gao scoring system and functions were evaluated by Tata scoring system., Results: There were two basic artery forms through preoperative ultrasonography and surgical exploration in 29 hands: both thumbs only had one PPDA; the main thumb had two while the extra thumb still had one. The former was responsible in 82.76％ (24 hands).All cases were operated according to preoperative design using an island compound flap.26 hands in 23 patients were followed up more than 6 months. Flap results included survival in 22 patients, tension vesicle in 2 patients and tip necrosis in 2 patients. The incision was infected in one patient with the treatment of changing dressing regularly. The function results were excellent in 21 patients, good in 4,fair in 1.Aesthetic results were excellent in 13 patients, good in 4 and fair in 1., Conclusions: There is always one developed PDAA in extra thumb, which can be used to design a flap. The longitudinal advanced flap can also eliminate the tension caused by unequal length in two thumbs. Using an axial or island flap to reconstruct a new thumb can not only change the appearance, but also make the reconstructed thumb acquire two sets of blood supply and nerve system.

Triphalangeal thumb (TPT) is a congenital condition characterized by the presence of an additional phalanx. Variable degrees of thumb deformity, malalignment, and excessive length are common features. Impairment of hand function has been reported with TPT probably secondary to anomalistic long thumb incompatible with fine hand skills. Abnormal thumb appearance moreover represents a major psychological concern from patient's perspective. Both removal of the extra phalanx and phalangeal reduction osteotomy with resection of the unhealthy extra interphalangeal joint are established methods for correction of the associated excessive thumb length. In our experience, however, previous surgical approaches have not been able to sufficiently reduce the skin and soft tissue surplus, which exists after reduction osteotomy through classic circular incisions. We thus feel that conduction of TPT reconstruction through a spiral incision provides a safe and generous anatomic exposure required for simultaneous reduction of skeletal and soft tissue components.

In children with absent thumbs, some authors have stated that 'relative' contraindications of pollicization include severe fixed flexion contracture and instability of the proximal interphalangeal joint of the index finger. The current author does not consider severe proximal interphalangeal joint deformities of the index finger as a contraindication to pollicization; and hence these children are offered the procedure. A literature review did not reveal any study that specifically documents the outcome of pollicization in these cases. The current series included five children: four with severe (over 80°) fixed flexion contracture of the proximal interphalangeal joint of the index finger and one with instability of the proximal interphalangeal joint. All children were initially assessed during infancy at their local hospitals and the parents were informed that a pollicization procedure would yield a poor outcome. Presentation to the author was relatively late at a mean of 9.3 years (range 2.5-12). All children underwent two surgical procedures: a pollicization followed by fusion of the new metacarpophalangeal joint. The overall early functional outcome was good and all children/parents were satisfied with the procedure. These encouraging results warrant a prospective long term study on various conditions that are considered as 'relative' contraindications to the pollicization procedure.Level evidence: IV Therapeutic (case series)., (© The Author(s) 2015.)

Unlabelled: This study reports on outcomes of the flexor digitorum superficialis tendon transfer from the ring finger in Type II and IIIA hypoplastic thumbs. We included 22 patients with 27 involved hands: 16 Type II thumbs and five Type IIIA treated by transfer and six non-operated Type II thumbs. The outcomes were assessed by range of motion, strength, sensibility, joint stability and patient/parent satisfaction. Compared with normative data, the range of motion was diminished in all patient groups. Opposition strength in operated Type II thumbs was significantly better than in non-operated thumbs. Grip strength, pinch strength, tripod strength and key pinch strength were approximately 50% of normal in Type II thumbs and 35% in Type IIIA thumbs. Metacarpophalangeal joint stability was restored in all operated Type II thumbs and in 40% of Type IIIA thumbs. We conclude that the flexor digitorum superficialis tendon transfer of the ring finger is a good functioning opponensplasty in both Type II and IIIA thumbs. The transfer provides excellent stability of the metacarpophalangeal joint in Type II thumbs., Level of Evidence: Level IV., (© The Author(s) 2015.)

Purpose: To report the functional outcomes associated with the flexor digitorum superficialis (FDS) opposition transfer for types II and IIIA thumb hypoplasia and determine if there is any noteworthy difference in the outcome dependent on the pulley used., Methods: We included patients who underwent a ring FDS opposition transfer and had at least 2 years follow-up. The study group consisted of 36 patients with 40 treated thumbs. All patients underwent follow-up examination and standardized testing. Outcome functional measures were recorded using the Pediatric Outcomes Data Collection Instrument (PODCI). There were 9 type II and 31 type IIIA hypoplastic thumbs. All patients underwent a ring FDS opposition transfer and a 4-flap z-plasty for first web space deepening. The pulley for opposition was flexor carpi ulnaris in 19 and the transverse carpal ligament in 21. Thirty-six thumbs had ulnar collateral ligament reconstructions, with 5 of the 36 undergoing combined ulnar collateral ligament/radial collateral ligament stabilizations. Average follow-up was 7.6 years (range, 2-16 years)., Results: Average postoperative Kapandji score was 8 (range, 4-10). Grip, lateral pinch, and tripod pinch strengths averaged 46%, 49%, and 48% of age- and sex-matched normal controls, respectively. There was no significant difference between surgical pulleys used. The Pediatric Outcomes Data Collection Instrument global was 91 (range, 53-100), and PODCI happiness was 87 (range, 15-100)., Conclusions: We found the ring FDS opposition transfer to be an effective method for providing opposition for both type II and IIIA thumb hypoplasia. At follow-up, excellent opposition function and PODCI scores were noted, with no difference related to the type of pulley used. Type II thumbs had significantly greater grip and pinch strengths when compared with type IIIA thumbs., (Copyright © 2016 American Society for Surgery of the Hand. Published by Elsevier Inc. All rights reserved.)