Dataset Information

Wrist movements induce torque and lever force in the scaphoid: an ex vivo study.

ABSTRACT:

Purpose

We hypothesised that intercarpal K-wire fixation of adjacent carpal bones would reduce torque and lever force within a fractured scaphoid bone.

Methods

In eight cadaver wrists, a scaphoid osteotomy was stabilised using a locking nail, which also functioned as a sensor to measure isometric torque and lever forces between the fragments. The wrist was moved through 80% of full range of motion (ROM) to generate torque and force within the scaphoid. Testing was performed with and without loading of the wrist and K-wire stabilisation of the adjacent carpal bones.

Results

Average torque and lever force values were 49.6 ± 25.1 Nmm and 3.5 ± 0.9 N during extension and 41 ± 26.7 Nmm and 8.1 ± 2.8 N during flexion. Torque and lever force did not depend on scaphoid size, individual wrist ROM, or deviations of the sensor versus the anatomic axis. K-wire fixation did not produce significant changes in average torque and lever force values except with wrist radial abduction (P = 0.0485). Other than wrist extension, torque direction was not predictable.

Conclusion

In unstable scaphoid fractures, we suggest securing rotational stability with selected implants for functional postoperative care. Wrist ROM within 20% extension and radial abduction to 50% flexion limit torque and lever force exacerbation between scaphoid fragments.

SUBMITTER: Erhart J

PROVIDER: S-EPMC7457810 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature

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Publications

Wrist movements induce torque and lever force in the scaphoid: an ex vivo study.

Erhart Jochen J Unger Ewald E Schefzig Philip P Varga Peter P Hagmann Michael M Ristl Robin R Hajdu Stefan S Gormasz Anna A Sadoghi Patrick P Mayr Winfried W

Journal of orthopaedic surgery and research 20200831 1

<h4>Purpose</h4>We hypothesised that intercarpal K-wire fixation of adjacent carpal bones would reduce torque and lever force within a fractured scaphoid bone.<h4>Methods</h4>In eight cadaver wrists, a scaphoid osteotomy was stabilised using a locking nail, which also functioned as a sensor to measure isometric torque and lever forces between the fragments. The wrist was moved through 80% of full range of motion (ROM) to generate torque and force within the scaphoid. Testing was performed with a ...[more]

PMID: 32867789

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Dataset Information

Wrist movements induce torque and lever force in the scaphoid: an ex vivo study.

Purpose

Methods

Results

Conclusion

Publications

Wrist movements induce torque and lever force in the scaphoid: an ex vivo study.

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