Purpose: Purpose: Prognostic factors for a satisfactory result for repaired tears have been postulated to include patient age and size of tear. The purpose of this study was to examine the impact of rotator cuff tear size on pre-operative and 2 year post-operative perceived functional level of patients undergoing repair of the full-thickness tear.

Methods: Methods: Data of 88 consecutive patients were included in data analysis. Patients were categorized into two groups: small or moderate tear (SMT) group, and large or massive tear (LMT) group. Two self-report measures - the Western Ontario Rotator Cuff Index (WORC), and the American Shoulder and Elbow Surgeons (ASES) evaluation form - were used to examine disability at baseline, and two years after surgery for repair of the rotator cuff. The Constant Murley (CM), which evaluates range of motion, strength and self-report function, was also used at the two time periods. A two-way, repeated measures analysis of co-variance (ANCOVA) compared the two groups across the two times. Covariates were age and gender.

Results: Results: Fifty-two patients (mean age = 56.6±10.4) had small or moderate and 36 (mean age = 66.7±11.3) had large or massive full-thickness tears. The results of all measures at both time periods demonstrated poorer function for the LMT group (pre WORC 31.4, post WORC 59.0; pre ASES 37.0, post ASES 65.0; pre CM 49.3, post CM 69.6) compared to the SMT group (pre WORC 38.2, post WORC 67.2; pre ASES 43.4, post ASES 73.8; pre CM 55.3, post CM 80.7). Both groups had improved function at 2 years post-operatively, but the rate of change was similar in the two groups.

Conclusions: Conclusion: The results of this study indicate that the size of a full-thickness tear of the rotator cuff has an effect on shoulder function both pre and postoperatively, but not on the pattern of recovery.