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Related Experiment Videos

The silicone scaphoid: a biomechanical study.

S F Viegas1, R M Patterson, P D Peterson

  • 1Division of Orthopaedic Surgery, University of Texas Medical Branch, Galveston 77551.

The Journal of Hand Surgery
|January 1, 1991
PubMed
Summary
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The scaphoid silicone implant bears significant load in the wrist, even when undersized or combined with carpal fusion. This wrist implant demonstrates load-bearing capacity, offering a viable option for scaphoid reconstruction.

Area of Science:

  • Orthopedic biomechanics
  • Hand and wrist surgery
  • Biomaterials science

Background:

  • Scaphoid fractures are common, often leading to nonunion and wrist arthritis.
  • Scaphoid silicone implants are used to restore carpal height and stability after scaphoid resection.
  • Understanding the load-bearing capacity of these implants is crucial for predicting clinical outcomes.

Purpose of the Study:

  • To evaluate the load-bearing characteristics of a scaphoid silicone implant.
  • To assess the implant's performance under different conditions, including varying sizes and associated carpal fusions.

Main Methods:

  • Fresh cadaver upper extremities were utilized in a biomechanical study.
  • A static positioning frame, pressure-sensitive film, and videodigitizing system were employed.

Related Experiment Videos

  • Load-bearing was assessed in native state, post-scaphoid resection, post-implant placement, and with simulated carpal fusion.

    • Main Results:

    • The scaphoid silicone implant demonstrated significant load-bearing capacity, though less than the native scaphoid.
    • Reduced implant size correlated with decreased load absorption by the implant.
    • The lunate compensated for decreased load through the scaphoid implant; limited carpal fusion did not significantly alter implant load.

    Conclusions:

    • The silicone scaphoid implant functions as a load-bearing device.
    • Its load-bearing capability is maintained even when undersized or in conjunction with limited carpal fusion.
    • These findings support the use of silicone scaphoid implants in scaphoid reconstruction.