TITLE

Anatomic Factors Related to the Cause of Tennis Elbow

AUTHOR(S)
Bunata, Robert E.; Brown, David S.; Capelo, Roderick
PUB. DATE
September 2007
SOURCE
Journal of Bone & Joint Surgery, American Volume;Sep2007, Vol. 89-A Issue 9, p1955
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Background: The pathogenesis of lateral epicondylitis remains unclear. Our purpose was to study the anatomy of the lateral aspect of the elbow under static and dynamic conditions in order to identify bone-to-tendon and tendon-to-tendon contact or rubbing that might cause abrasion of the tissues. Methods: Eighty-five cadaveric elbows were examined to determine details related to the bone structure and musculotendinous origins. We identified the relative positions of the musculotendinous units and the underlying bone when the elbow was in different degrees of flexion. We also recorded the contact between the extensor carpi radialis brevis and the lateral edge of the capitellum as elbow motion occurred, and we sought to identify the areas of the capitellum and extensor carpi radialis brevis where contact occurs. Results: The average site of origin of the extensor carpi radialis brevis on the humerus lay slightly medial and superior to the outer edge of the capitellum. As the elbow was extended, the undersurface of the extensor carpi radialis brevis rubbed against the lateral edge of the capitellum while the extensor carpi radialis longus compressed the brevis against the underlying bone. Conclusions: The extensor carpi radialis brevis tendon has a unique anatomic location that makes its undersurface vulnerable to contact and abrasion against the lateral edge of the capitellum during elbow motion. Clinical Relevance: This information may help us to understand the pathomechanics of lateral epicondylitis and provide a better rationale for operative and nonoperative treatment.
ACCESSION #
26613657

 

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