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

Abstract

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.