PECTORALIS MAJOR TRANSFER IN ARTHROGRYPOSIS: RESULTS 9 TO 12 YEARS AFTER SURGERY

Abstract

Introduction: The purpose of this study was to evaluate the results 9 to 12 years after the transfer of 3 distal parts of pectoralis major muscle to restore active elbow flexion in patient with arthrogryposis.

Material and methods: From 1996 to 1999, elbow flexion was reconstructed in 9 upper extremities by 5 patient aged 4.3–9 years. The patients were clinically evaluated according to the subjective and objective assessment and examined electromyographically before the surgery and during the follow up. Last clinical examination was provided 8 to12 years after the surgery in patients aged 15 to 18 years.

Results: 3–4 years after pectoralis major transfer, 6 very good and good results were achieved, the average active ROM of elbow ranged 15 to 95 degrees. The power of elbow flexion was graded as 4 and 4+. This method was unsuccessful in the remaining 3 cases, the patients were not able to reach the mouth with the hands because of limited elbow flexion. 9 to12 years after the surgery, the results were similar. 5 extremities remain very good and good. One deterioration was obvious. The ROM of elbow changed, namely the extension was mostly reduced even in very good and good evaluations (the average decrease was 13.8 degrees, the range −20 to +10 deg.). The active flexion was not changed in 5 elbows, or it was increased (the average increase 4,4 deg., the range 0–15 deg.). The final limitation of extension (30 – 50 degrees) does not restrict using the hands for perineal hygiene and the final active flexion (85–100 degrees) allows elevating the hands to the head for feeding and toilet.

Discussion and Conclusions: From the analysis of unsuccessful results 3–4 years after the surgery it was obvious that all cases were related to very limited preoperative passive flexion of the elbow; restricted movement of the shoulder and failed distal fixation of the transferred muscle. After 9–12 years, the active elbow flexion and extension for raising the hands to the mouth and for toilet needs, respectively, remain in majority previously successful cases. Because most children reached the skeletal maturity, no further shortening of the transferred muscle and limitation of extension is expected. These findings do not concur with the literature reports. According to our results, the transfer of the pectoralis major represents the efficient method for permanent restoring of bilateral active elbow flexion with the remaining functional extension. The ROM does not change significantly after having reached the plateau 2 years postoperatively. The prerequisites for successful results are a minimum of 90 degrees of passive flexion of the elbow before the surgery, the active shoulder abduction of 80–90 degrees, long-term rehabilitation and successful fixation of the transferred muscle to the forearm.