April 01, 2016
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Many patients did not reach minimal clinically important difference for function, strength after RSA

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Following reverse shoulder arthroplasty for a cuff-deficient shoulder, a considerable number of patients did not reach a minimal clinically important difference in function or strength domains, despite showing statistically significant improvements in the Constant score, according to results.

Researchers recorded Constant scores before reverse shoulder arthroplasty was performed in 60 patients with a cuff-deficient shoulder and at 1-year follow-up. To determine minimal clinically important difference, patients also filled out a 15-item anchor questionnaire to assess their perceptions of change in their overall function, forward elevation, lateral rotation, internal rotation and strength at 1-year follow-up.

Carlos Torrens

Results showed statistically significant improvement in the Constant score from 30.1 points preoperatively to 58.4 points at 1-year follow-up. Researchers also found statistically significant improvement in the domains of forward elevation, lateral rotation and strength. However, significant improvement was not found in the domain of internal rotation.

The minimal clinically important difference had an increase of 8 points for overall function, 6 points for forward elevation, 2 points each for both lateral rotation and internal rotation, and 11.5 points for strength in the Constant score, according to results. After surgery, results showed the minimal clinically important difference was exceeded on each domain by 46.7% of patients for overall function; 20% of patients for forward elevation; 50% of patients for lateral rotation; 45.8% of patients for internal rotation and 33.3% of patients for strength. – by Casey Tingle

 

Disclosure: The researchers report no relevant financial disclosures.