Feasibility of latissimus and teres major transfer to reconstruct irreparable subscapularis tendon tear: an anatomic study.

Background: Several tendon transfers have been described to reconstruct irreparable subscapularis (SS) tears, but their outcomes are variable and unsatisfactory in the presence of anterior glenohumeral subluxation. We evaluated the anatomic feasibility of the latissimus dorsi (LD) or teres major (TM) muscle tendon transfer to reconstruct an irreparable SS tendon tear.

Materials And Methods: The dimensions of the LD and TM tendons and the distance between their insertion and the SS tendon insertion were determined In 20 cadaveric shoulders. Feasibility of the isolated LD and TM tendon transfer to 3 locations on the SS tendon insertion, transfer of the LD to the proximal half, TM to the lower half of the SS tendon, and combined transfer of the LD/TM tendon to the central aspect of the SS tendon was assessed.

Results: The LD and TM were an average length of 5.9 cm and 2.3 cm and an average width of 2.2 cm and 2.4 cm, respectively. The mean distances from the center of the LD and TM tendons insertion to the central aspect of the SS tendon insertion was 4.0 cm and 4.7 cm, respectively. All of the tendon transfers were feasible, and the risk of nerve compression was low, except for the combined tendon LD/TM transfer to the proximal third of the SS tendon.

Conclusions: This study shows that transfer of the LD/TM to the lesser tuberosity to reconstruct an irreparable SS tear is feasible, with a low risk of nerve compression, with the exception of the combined LD/TM and more proximal TM tendon transfers.