WRIST EXTENSOR MUSCLE PATHOLOGY IN LATERAL EPICONDYLITIS

The morphology of the extensor carpi radialis brevis (ECRB) muscle was investigated in 20 patients with longstanding lateral epicondylitis. Muscle biopsies were obtained from the proximal or distal portion of the ECRB and analysed by enzyme- and immunohistochemical methods. Morphological abnormaliti...

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Bibliographic Details
Published in:Journal of hand surgery, British volume British volume, 1999-04, Vol.24 (2), p.177-183
Main Authors: LJUNG, B.-O., LIEBER, R.L., FRIDÉN, J.
Format: Article
Language:English
Subjects:
Adult
Biopsy
Female
Humans
Male
Middle Aged
Muscle, Skeletal - pathology
Tennis Elbow - pathology
Wrist
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Summary:The morphology of the extensor carpi radialis brevis (ECRB) muscle was investigated in 20 patients with longstanding lateral epicondylitis. Muscle biopsies were obtained from the proximal or distal portion of the ECRB and analysed by enzyme- and immunohistochemical methods. Morphological abnormalities were significantly more frequent in patients than controls and included moth-eaten fibres, fibre necrosis and signs of muscle fibre regeneration as well as higher percentages of the fast-twitch oxidative (type 2A) fibre type. Changes were equally distributed proximally and distally. It is concluded that these changes, directly or indirectly, may reflect the cumulative effect of mechanical and/or metabolic overload and that decreased muscular performance in patients with lateral epicondylitis may be due to both elbow pain and physical damage to the ECRB muscle.
ISSN:0266-7681
1532-2211
DOI:10.1054/jhsb.1998.0178