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<p>To evaluate the biomechanical characteristics of three surgical reconstruction techniques for scapholunate (SL) dissociation, namely, the original SwiveLock (OSW), modified SwiveLock (MSW), and anatomical front and back (ANAFAB) techniques, with emphasis on the roles of the dorsal and volar stabilizers in restoring carpal kinematics. Eleven upper limbs from seven fresh-frozen male cadavers were tested under four wrist motions. After creating SL dissociation, each specimen underwent reconstruction in a randomized sequence using the OSW (dorsal scapholunate interosseous ligament repair alone), MSW (dorsal scapholunate interosseous ligament plus dorsal intercarpal ligament reconstruction), and ANAFAB (combined dorsal and volar reconstruction) techniques. An optical motion capture system was used to measure the SL distance, radioscaphoid angle (RSA), radiolunate angle (RLA), and scapholunate angle (SLA). All three techniques improved SL alignment and carpal kinematics to varying extents. OSW most closely reproduced the SL distance of the intact wrist during motion. Although the MSW technique placed excessive stress on the dorsal structures, it effectively controlled the rotational alignment and wrist posture, similar to the ANAFAB technique. The ANAFAB technique paradoxically showed greater SL gap widening during wrist motion; however, overall, it showed the most robust structure because it reconstructed both the dorsal and volar stabilizers. Each reconstruction technique displayed distinct biomechanical patterns without statistically superior performance across all parameters. MSW provided carpal kinematics similar to those of ANAFAB with less surgical complexity. These findings suggest that the surgical strategy should be guided by the ligament injury pattern, chronicity, and reducibility.</p>

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Kinematic Analysis of Three Different Reconstruction Techniques for Scapholunate Dissociation: A Cadaveric Biomechanical Study

  • 期刊论文

  • 发表日期：

    2026年6月22日

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  • Il-Jung Park,
  • Soo-Hwan Kang,
  • Joo-Yup Lee,
  • Jin-Hyung Im,
  • Youn-Tae Roh,
  • Dai-Soon Kwak

摘要

To evaluate the biomechanical characteristics of three surgical reconstruction techniques for scapholunate (SL) dissociation, namely, the original SwiveLock (OSW), modified SwiveLock (MSW), and anatomical front and back (ANAFAB) techniques, with emphasis on the roles of the dorsal and volar stabilizers in restoring carpal kinematics. Eleven upper limbs from seven fresh-frozen male cadavers were tested under four wrist motions. After creating SL dissociation, each specimen underwent reconstruction in a randomized sequence using the OSW (dorsal scapholunate interosseous ligament repair alone), MSW (dorsal scapholunate interosseous ligament plus dorsal intercarpal ligament reconstruction), and ANAFAB (combined dorsal and volar reconstruction) techniques. An optical motion capture system was used to measure the SL distance, radioscaphoid angle (RSA), radiolunate angle (RLA), and scapholunate angle (SLA). All three techniques improved SL alignment and carpal kinematics to varying extents. OSW most closely reproduced the SL distance of the intact wrist during motion. Although the MSW technique placed excessive stress on the dorsal structures, it effectively controlled the rotational alignment and wrist posture, similar to the ANAFAB technique. The ANAFAB technique paradoxically showed greater SL gap widening during wrist motion; however, overall, it showed the most robust structure because it reconstructed both the dorsal and volar stabilizers. Each reconstruction technique displayed distinct biomechanical patterns without statistically superior performance across all parameters. MSW provided carpal kinematics similar to those of ANAFAB with less surgical complexity. These findings suggest that the surgical strategy should be guided by the ligament injury pattern, chronicity, and reducibility.