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The Effect of the Extent of A1 Pulley Release on the Force Required to Flex the Digits

A cadaver study on the thumb, middle and ring fingers

From the Departments of Orthopaedic Surgery, Tan Tock Seng Hospital and National University of Singapore and the Department of Experimental Surgery, Singapore General Hospital, Singapore

Correspondence: Dr C. K. Low. Department of Orthopaedic Surgery, Tan Tock Seng Hospital, Moulmein Road, Singapore 308433.

The A1 pulley was released distally in consecutive stages by 25%, 50%, 75% and 100% of its length. The force required to fully flex the digit at each stage was recorded. The force decreased with more extensive A1 pulley release and this became significant when more than 50% of the pulley was released. These changes were probably due to loss of friction force rather than bowstringing of the tendon.

Journal of Hand Surgery (British and European Volume), Vol. 23, No. 1, 46-49 (1998)
DOI: 10.1016/S0266-7681(98)80217-9


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