Abstract
Introduction: This study was designed to investigate which parameters of the Constant Score are most influenced by the presence of a Rotator Cuff Tear (RCT).
Methods: 28 patients attending the Shoulder Clinic took part in this study for which Ethics approval had been obtained. Strength measurements were assessed in three ways: 1) maximum force using a fixed spring balance (FSB) 2) maximum force using the Nottingham Mecmesin Myometer 3) mean force during 2nd to 4th seconds using Nottingham Myometer. The CS assessor was blind to the volunteer’s history and state of their rotator cuff. Ultrasonography was used to establish the presence of a full-thickness RCT.
Results: The CS values for the left and right shoulders were analysed separately. No statistically significant difference (p> 0.05) was found between shoulders with a RCT and without a RCT in the pain, ADL and ROM parameters. Left shoulders with a RCT scored significantly different strength scores to those without (p< 0.05) but this significance was not seen in the right shoulders (p> 0.05). Shoulder strength measurements were highest with the FSB and lowest when measured using the mean force.
Discussion: The results obtained so far suggest that a shoulder with a full-thickness tear of the RC may obtain a significantly lower strength score than a normal shoulder. It does not suggest that any of the other three parameters of the CS can indicate the presence of a tear.
Conclusion: A reduction of shoulder strength alone might be a good indicator of a full-thickness RCT. However, this study indicates the importance of standardising the method of shoulder strength assessment for the Constant Score.
These abstracts were prepared by Mr Cormac Kelly. Correspondence should be addressed to him c/o British Orthopaedic Association, Royal College of Surgeons, 35-43 Lincoln’s Inn Fields, London WC2A 3PN.
