The Journal of Arthroplasty
Volume 25, Issue 4 , Pages 624-634.e2, June 2010

Factors Affecting Bony Impingement in Hip Arthroplasty

  • William B. Kurtz, MD

      Affiliations

    • Tennessee Orthopaedic Alliance, Nashville, Tennessee
    • Corresponding Author InformationReprint requests: William B Kurtz, MD, Tennessee Orthopaedic Alliance, 301 21st Ave South, Nashville, TN 37203.
    • ,
  • Timo M. Ecker, MD

      Affiliations

    • Center for Computer Assisted and Reconstructive Surgery, New England Baptist Hospital, Boston, Massachusetts
    • ,
  • William M. Reichmann, BS

      Affiliations

    • New England Baptist Statistical Department, New England Baptist Hospital, Boston, Massachusetts
    • ,
  • Stephen B. Murphy, MD

      Affiliations

    • Center for Computer Assisted and Reconstructive Surgery, New England Baptist Hospital, Boston, Massachusetts

Received 24 June 2008; accepted 28 March 2009. published online 26 June 2009.

Abstract 

Computer modeling of 10 patients' computed tomographic scans was used to study the variables affecting hip arthroplasty range of motion before bony impingement (ROMBI) including acetabular offset and height, femoral offset, height and anteversion, and osteophyte removal. The ROMBI was compared with the ROM before component impingement and the native hip ROM. The ROMBI decreased with decreased total offset and limb shortening. Acetabular offset and height had a greater effect on ROMBI than femoral offset and height. The ROMBI lost with decreased acetabular offset was not fully recoverable with an increase in femoral offset or osteophyte removal. Bony impingement increased and component impingement decreased with decreased acetabular offset and increased head diameter.

Keywords: acetabular offset, center of rotation, bony impingement, hip arthroplasty range of motion

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 No benefits or funds were received in support of the study.

PII: S0883-5403(09)00105-3

doi:10.1016/j.arth.2009.03.024

The Journal of Arthroplasty
Volume 25, Issue 4 , Pages 624-634.e2, June 2010

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