Contribution of Flexor Pollicis Longus to Pinch Strength: An In Vivo Study

Goetz TJ, Costa JA, Slobogean G, et al (Univ of British Columbia, Vancouver) J Hand Surg 37A:2304-2309, 2012^§

Abstract

Purpose

To estimate the contribution of the flexor pollicis longus (FPL) to key pinch strength. Secondary outcomes include tip pinch, 3-point chuck pinch, and grip strength.

Methods

Eleven healthy volunteers consented to participate in the study. We recorded baseline measures for key, 3-point chuck, and tip pinch and for grip strength. In order to control for instability of the interphalangeal (IP) joint after FPL paralysis, pinch measurements were repeated after immobilizing the thumb IP joint. Measures were repeated after subjects underwent electromyography-guided lidocaine blockade of the FPL muscle. Nerve conduction studies and clinical examinations were used to confirm FPL blockade and to rule out median nerve blockade. Paired t

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