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The Journal of Bone and Joint Surgery (American) 83:S32-37 (2001)
© 2001 The Journal of Bone and Joint Surgery, Inc.

Scientific Article

Classification of Mobile-Bearing Knee Designs: Mobility and Constraint

Christine S. Heim, BSc, Paul D. Postak, BSc, Nicholas A. Plaxton, MS and A. Seth Greenwald, DPhil(Oxon)

Christine S. Heim, BSc
Paul D. Postak, BSc
Nicholas A. Plaxton, MS
A. Seth Greenwald, DPhil(Oxon)
Orthopaedic Research Laboratories, Lutheran Hospital, Cleveland Clinic Health System, 1730 West 25th Street, Cleveland, OH 44113. E-mail address for C.S. Heim: chris@orl-inc.com. E-mail address for A.S. Greenwald: seth@orl-inc.com

In support of their research or preparation of this manuscript, one or more of the authors received grants or outside funding from Biomet, Incorporated; DePuy Orthopaedics, Incorporated; Smith and Nephew, Incorporated; Corin Medical, Limited; Howmedica International; Link Orthopaedics; Sulzer Orthopedics, Limited; and Zimmer, Incorporated. None of the authors received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity. No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, educational institution, or other charitable or nonprofit organization with which the authors are affiliated or associated.

The first 150 words of the full text of this article appear below.


   Introduction
 
Restoration of normal knee joint function through surgical reconstruction is dependent upon load-sharing between the implant and the surrounding soft-tissue structures. Mobile-bearing knee designs offer the advantage of maximally conforming geometry while diminishing constraint forces to fixation interfaces through plateau mobility. The degree of mobility afforded by these designs in the anterior-posterior, medial-lateral, and rotational directions defines the required interaction between the soft tissues and the design geometry to maintain a stable articulation.

This study characterizes nine contemporary mobile-bearing designs in terms of the force generated during a prescribed displacement. Among the designs evaluated, only the LCS Deep Dish Rotating Platform is available for clinical use in the United States.


   Materials and Methods
 
A dynamic testing system capable of applying biaxial loads (Instron Testing Machine, model 1115; Instron, Canton, Massachusetts) was utilized to assess the intrinsic performance characteristics of nine non-hinged, mobile-bearing knee designs. Anterior, posterior, medial, lateral, and rotational constraints were determined . . . [Full Text of this Article]


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