Abstract
Introduction A procedure of selective musculo-tendinous lengthenings is presented as treatment for chronic lateral elbow pain. The rationale for surgery is to decrease tensile force at the lateral epicondyle and simultaneously reduce posterior interosseous nerve compression in the radial tunnel. This study presents biomechanical and clinical data on this surgical technique.
Methods In a human cadaver study, force transducer measurements were made in the common extensor tendon, and after sequential tensioning of the muscles arising from the lateral epicondyle. In a separate cadaver study, a balloon catheter measured pressure in the radial tunnel after sequential musculo-tendinous lengthening of the forearm extensor muscles. A preliminary clinical study was performed on 12 subjects (13 elbows). All had failed extensive conservative treatment and subsequently underwent combined musculo-tendinous lengthening of ECRB, EDC, and superficial head of supinator (SHS). In the clinical series, 75% of subjects were involved in Work Cover claims. Clinical outcomes in this small series were reviewed.
Results ECRB and EDC tensioning produced the largest force transducer measurements in the common extensor tendon at the lateral epicondyle. SHS increased force transducer measurements moderately, suggesting this muscle may also contribute to the clinical syndrome of lateral epicondylitis. ECRL and ECU tensioning lead to non significant increases in force transducer measurements. Radial tunnel pressure dropped substantially (77%) after musculo-tendinous lengthening of SHS. Lengthening of other forearm extensors had little effect on measured radial tunnel pressure. All subjects recorded improvement in visual analogue pain scores, with post-operative scores between zero and two. Grip strength was preserved or improved. By the criteria of Roles and Maudsley, nine elbows were excellent, two good, one fair and one poor. Overall 11 of the 12 subjects reported they would have the procedure again.
Conclusions This study demonstrates a biomechanical basis for SHS in the aetiology of lateral epicondylitis and radial tunnel syndrome, and supports a combined musculo-tendinous lengthening of ECRB, EDC, and SHS in the treatment of chronic lateral elbow pain. Satisfactory clinical results are reported in this group of patients including those involved in Work Cover claims.
The abstracts were prepared by Mr Jerzy Sikorski. Correspondence should be addressed to him at the Australian Orthopaedic Association, Ground Floor, William Bland Centre, 229 Macquarie Street, Sydney NSW 2000, Australia.
None of the authors have received any payment or consideration from any source for the conduct of this study.
