Abstract
Aim
Two different techniques to release subscapularis during total shoulder replacement (TSR) have been described (tenotomy and osteotomy) with no consensus as to which is superior. In this study we review the clinical outcomes of a sequential series of patients in whom a TSR for primary osteoarthritis had been performed using either technique at our institution. Subscapularis function was tested using a new graded belly press test, a modification of the traditional belly press test which is described for the first time here.
Methods
All patients who underwent surgery at our institution between January 2002 and January 2010 and met the eligibility criteria, were included for analysis. Subscapularis function was assessed post-operatively using a range of functional assessments including; a graded belly press test, lift off test, and an assessment of each patient's range of movement.
Results
A total of 36 shoulders in 36 patients were included, ten underwent subscapularis tenotomy and 26 underwent osteotomy of the lesser tuberosity. Patients who had undergone osteotomy of the lesser tuberosity had a more favourable outcome overall. They demonstrated a significantly better grade (grade 1) of the belly press test compared with the tenotomy group (p=0.026) and a trend towards a better range of movement although no statistical significance was shown. All patients (osteotomy and tenotomy) with a grade 1 belly press test had a better clinical outcome with data demonstrating statistical significance.
Conclusion
Our results indicate that in this single surgeon sequential series of patients who underwent osteotomy of the lesser tuberosity during TSR for OA had a better functional outcome than those who underwent subscapularis tenotomy. While our modification of the belly press test may require further validation we would suggest it may be a more useful indicator of subscapularis function in future studies.
