• Giovanni Merolla, Paolo Paladini, Stefano Artiaco, Pierluigi Tos, Nicola Lollino, and Giuseppe Porcellini.
• Unit of Shoulder and Elbow Surgery, D. Cervesi Hospital, Cattolica - AUSL della Romagna, Via L. V. Beethoven 46, Cattolica, Italy, giovannimerolla@hotmail.com.
• Eur J Orthop Surg Tr. 2015 Jan 1; 25 (1): 91-8.

BackgroundPectoralis major (PM) tendon rupture is an uncommon injury whose incidence has risen in recent decades mainly as a result of the increasing number of sports-practising individuals. This study evaluates clinical and ultrasound (US) outcomes after surgical repair of acute and chronic PM tendon rupture.Materials And MethodsTwelve men with PM tendon rupture (9 right and 3 left shoulders) were enrolled. Mean age was 34.6 years, and mean follow-up was 60 months (range 12-108). Rupture was diagnosed by magnetic resonance imaging. Eight patients underwent direct tendon repair (acute group) and 4 had allograft reconstruction (chronic group). Pain, range of motion, strength recovery and return to sports were assessed. Postoperative X-ray and US scans were obtained in all patients. Final outcomes were graded as excellent, good, fair or poor. Isometric strength in adduction/abduction, flexion, internal rotation (IR) and external rotation was recorded.ResultsThere were 9 excellent and 3 good outcomes. A comparative strength assessment failed to show significant differences in any plane. Mean strength was not significantly different between affected and unaffected arm. Slight but significantly lower strength in IR with the arm adducted (p = 0.0306) was found in chronic patients. On US, all PM tendons appeared to be anatomically intact and continuous with the humerus.DiscussionPrompt surgical repair ensures satisfactory outcomes in patients with complete PM rupture; however, delayed allograft repair provides good results with only slight strength impairment. Fresh insights are provided on the role of US in evaluating PM anatomy and tendon attachment to bone.

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