[Polymyography recording in epicondylopathia humeri radialis]

The innervation pattern of arm muscles in tennis elbow during defined movement of the wrist was analysed by polymyography. 30 patients with tennis elbow and 40 control persons had been investigated. Dorsal and palmar movements of the wrist joint lifting 5 kg had been performed. The electromyogram of 8 muscles had been registered. There was no abnormality in palmar flexion. The height and integrals of amplitudes in extensor muscles during extension had been considerably smaller. It is suggested that in tennis elbow the dorsal extension is exerted by a smaller number of fibers. This might be the cause of enthesiopathy.