Abstract
Nine fresh-frozen normal human cadaveric long fingers were used to compare the kinematics
of the proximal interphalangeal joint (PIP) before and after a resurfacing metal-polyethylene
prosthetic replacement (Avanta prosthesis, San Diego, CA) using the magnetic Isotrak
system (Polhemus Navigational Systems, Colchester, VT). The kinematics of the PIP
joint after replacement were similar to that of the normal joint. The maximum angular
displacement was 5° for lateral deviation and 9° for rotation during the passive flexion
and extension motion. The center of rotation after implant insertion was nearly identical
to the center of rotation of the normal joint. This anatomically designed PIP prosthesis
has potential to restore normal motion to the finger PIP joint while resisting physiologic
out-of-plane forces such as pinch and grasp. (J Hand Surg 2000;25A:305–312. Copyright
© 2000 by the American Society for Surgery of the Hand.)
Keywords
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Article info
Publication history
Accepted:
November 10,
1999
Received:
May 3,
1996
Footnotes
*The author or one or more of the authors have received or will receive benefits for personal or professional use from a commercial party related directly or indirectly to the subject of this article. In addition, benefits have been or will be directed to a research fund, foundation, educational institution, or other non-profit organization with which one or more of the authors are associated.
**Reprint requests: William P. Cooney III, MD, Biomechanics Laboratory, Mayo Clinic, Rochester, MN 55905.
*0363-5023/00/25A02-0016$3.00/0
**J Hand Surg 2000;25A;305–312
Identification
Copyright
© 2000 American Society for Surgery of the Hand. Published by Elsevier Inc. All rights reserved.
