Seminars in Spine Surgery
Volume 18, Issue 2 , Pages 117-129, June 2006

Kinematics of Cervical and Lumbar Total Disc Replacement

  • William R. Sears, MB, BS, FRACS

      Affiliations

    • Sydney NeuroSpine Clinic and Departments of Neurosurgery, Royal North Shore, and Dalcross Private Hospitals, Sydney, Australia.
    • Corresponding Author InformationAddress reprint requests to William Sears, Sydney NeuroSpine Clinic, Level 10, Tower B, 799 Pacific Highway, Chatswood, NSW, 2067, Australia.
    • ,
  • Peter F. McCombe, MB, BS, FRACS

      Affiliations

    • Department of Orthopedics, Royal Brisbane Hospital, Brisbane, Australia.
    • ,
  • Rick C. Sasso, MD

      Affiliations

    • Indiana Spine Group, Indiana University School of Medicine, Indianapolis, IN.

This article reviews the kinematics of disc arthroplasty and the different ways that current devices attempt to replicate normal segmental motion. All disc replacements are capable of rotation but not all are able to independently translate. It is “constraint” over the degree-of-freedom controlling independent translation of a prosthesis that dictates whether its center of rotation is fixed or can attempt to adjust to that of the implanted motion segment. Ball-and-socket-type articulations are constrained, while mobile core prostheses are unconstrained. The ideal kinematic type is yet to be determined and it may be that different circumstances will be best managed by different types of prostheses.

Keywords:  total disc replacement arthroplasty , kinematics , biomechanics , biomechanical testing , motion constraint

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 Financial Disclosure: The authors are consultants to the Medtronic Sofamor Danek Company, Memphis, TN. Financial support was provided by Medtronic Sofamor Danek in the form of a research assistant, Gavin White, whose help is gratefully acknowledged.

PII: S1040-7383(06)00030-X

doi:10.1053/j.semss.2006.03.013

Seminars in Spine Surgery
Volume 18, Issue 2 , Pages 117-129, June 2006

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