A 3 C/SEC LEG TREMOR IN A “CEREBELLAR” SYNDROME

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Abstract
A unique leg tremor was found in patients with late (acquired) cerebellar atrophy. Such patients are classically said to show a cerebellar incoordination in the heel-knee test. The tremor was evoked in 3 sustained leg postures inducing single plane oscillations. In these tests the tremor occurred as leg extensions, adductions or torsions. Accelerometer records showed a simple 2.5-3.5 Hz rhythm. The amplitude varied but the rate was remarkably constant. The heel-on-knee position elicited tremor activity in muscles working in various planes; the resulting compound oscillation could be confused with irregular goal-seeking movements.