The Journal of Arthroplasty
Volume 25, Issue 3 , Pages 375-380, April 2010

Cementless Total Hip Arthroplasty Using a Spongy Metal Surface Hip Prosthesis With a Collarless, Proximally Porous-Coated Stem

  • Hiroyasu Ogawa, MD

      Affiliations

    • Department of Orthopaedic Surgery Gifu University, School of Medicine Gifu, Japan
    • Corresponding Author InformationReprint requests: Hiroyasu Ogawa, MD, Department of Orthopaedic Surgery, Gifu University, School of Medicine. 1-1, Yanagido, Gifu, Gifu, 501-1194 Japan.
    • ,
  • Yoshiki Ito, MD, PhD

      Affiliations

    • Department of Orthopaedic Surgery Gifu University, School of Medicine Gifu, Japan
    • ,
  • Mansho Itokazu, MD, PhD

      Affiliations

    • Department of Orthopaedic Surgery Hirano General Hospital Gifu, Japan
    • ,
  • Nobuyuki Mori, MD

      Affiliations

    • Department of Orthopaedic Surgery Gifu University, School of Medicine Gifu, Japan
    • ,
  • Nobuo Terabayashi, MD

      Affiliations

    • Department of Orthopaedic Surgery Gifu University, School of Medicine Gifu, Japan
    • ,
  • Katsuji Shimizu, MD, DMSc

      Affiliations

    • Department of Orthopaedic Surgery Gifu University, School of Medicine Gifu, Japan

Received 21 April 2008; accepted 10 January 2009. published online 06 February 2009.

Abstract 

A collarless, proximally porous-coated type of Spongiosa Metal II hip prosthesis was used for cementless total hip arthroplasty in 52 hips, and 48 hips were followed and assessed during a mean follow-up period of 6.3 years (minimum 5 years). There were 8 hips (16.7%) that had stress shielding, and 2 hips (4.2%) that had thigh pain. In terms of stability, the stem was bony stable in 39 hips, fibrous stable in 6, and unstable in 3. The stability of the stem was significantly correlated with the stem canal filling ratio. It was suggested that the much more proximal transfer of loading stress by a collarless, proximally porous-coated stem is not suitable for the Spongiosa Metal II series because it may unacceptably reduce the stability of the stem.

Keywords: cementless total hip arthroplasty, spongy metal surface, Japanese Orthopaedic Association (JOA) score, stability, stem canal filling ratio

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

PII: S0883-5403(09)00018-7

doi:10.1016/j.arth.2009.01.012

The Journal of Arthroplasty
Volume 25, Issue 3 , Pages 375-380, April 2010

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