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Erhart, J; Unger, E; Schefzig, P; Varga, P; Hagmann, M; Ristl, R; Hajdu, S; Gormasz, A; Sadoghi, P; Mayr, W.
Wrist movements induce torque and lever force in the scaphoid: an ex vivo study.
J Orthop Surg Res. 2020; 15(1): 368-368. Doi: 10.1186/s13018-020-01897-y [OPEN ACCESS]
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Sadoghi Patrick

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

Find related publications in this database (Keywords)
Scaphoid fracture
Wrist movement
Torque and lever force
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