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In vivo flexor tendon forces increase with finger and wrist flexion during active finger flexion and extension.

Authors
Kursa-K; Lattanza-L; Diao-E; Rempel-D
Source
J Orthop Res 2006 Apr; 24(4):763-769
NIOSHTIC No.
20030116
Abstract
The effects of different hand motions and positions used during early protected motion rehabilitation on tendon forces are not well understood. The goal of this study was to determine in vivo forces in human flexor digitorum profundus (FDP) and flexor digitorum superficialis (FDS) tendons of the index finger during active unresisted finger flexion and extension. During open carpal tunnel surgery (n = 12), flexor tendon forces were acquired with buckle force transducers, and finger positions were recorded on video while subjects actively flexed and extended the fingers at two different wrist angles. Mean in vivo FDP tendon forces varied between 1.3N +/- 0.9 N and 4.0 N +/- 2.9 N while mean FDS tendon forces ranged from 1.3N +/- 0.5 N to 8.5 N +/- 10.7 N. FDP force increased with active finger flexion at both wrist angles of 0 degrees or 30 degrees flexion. FDS force increased with finger flexion when the wrist was in 30 degrees flexion, but was unchanged when the wrist was in 0 degrees of flexion. Tendon forces were similar regardless of whether the fingers were moving in the flexion or extension direction. Active finger flexion and extension with the wrist at 0 degrees and 30 degrees flexion may be used during early rehabilitation protocols with limited risk of repair rupture. This risk can be further decreased for a FDS tendon repair by reducing wrist flexion angle.
Keywords
In-vivo-studies; Biomechanics; Injuries; Hand-injuries; Physiology
Contact
David Rempel, Department of Medicine, University of California, San Francisco, 1301 South 46th Street, Building 163, Richmond, California 94804
CODEN
JOREDR
Publication Date
20060401
Document Type
Journal Article
Email Address
drempel@itsa.ucsf.edu
Funding Amount
518352
Funding Type
Grant
Fiscal Year
2006
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-003414; Grant-Number-T42-OH-008429
Issue of Publication
4
ISSN
0736-0266
Priority Area
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities
Source Name
Journal of Orthopaedic Research
State
CA
Performing Organization
University of California, Richmond, California
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