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Updated: Jan 8, 2026

Vascularized Composite Hand Allograft Procurement and Preparation for Distal and Proximal Forearm Allotransplantation: A Stepwise Approach

Vascularized Composite Hand Allograft Procurement and Preparation for Distal and Proximal Forearm Allotransplantation: A Stepwise Approach

Published on: May 23, 2025

前腕骨間膜における橈骨と尺骨間の荷重伝達：肘屈曲および内反-外反アライメントの影響

Takahiro Yamazaki¹, Yusuke Matsuura¹, Takashi Nomoto¹

¹Department of Orthopaedic Surgery, Graduate school of Medicine, Chiba University, 1-8-1 Inohana Chuo-ku, Chiba 260-8670, Japan.

Clinical biomechanics (Bristol, Avon)

|December 21, 2025

要旨

Background:

The forearm interosseous membrane helps distribute load between the radius and ulna, yet the combined influence of elbow flexion and varus-valgus alignment on load transfer remains unclear. This study aimed to quantify interosseous membrane-mediated load transfer across elbow flexion angles under varus and valgus loading.

Methods:

Seven fresh-frozen cadaveric forearms were tested using a custom setup with tension/compression force sensors mounted to record loads transmitted through the radius and ulna. Specimens were positioned at multiple elbow flexion angles within 0-90° under controlled varus and valgus loading. The interosseous membrane load-transfer rate was calculated from synchronized force data, and conditions were compared statistically (Wilcoxon signed-rank test).

Findings:

The interosseous membrane load-transfer rate was significantly greater under varus than valgus loading (mean ± SD: 24.4 ± 14.8 % vs 10.1 ± 7.9 %, p < 0.001). Across the tested elbow flexion angles, flexion had no significant effect on the load-transfer rate in either alignment condition.

Interpretation:

Within the tested range, varus-valgus alignment, rather than elbow flexion angle, primarily determines the magnitude of interosseous membrane -mediated load transfer. These findings provide biomechanical insight relevant to understanding injury mechanisms and may inform alignment considerations during rehabilitation or immobilization.

キーワード:

生体力学献体研究前腕骨間膜荷重伝達内反-外反

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