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Letters

Joint first for hip and knee replacements

Max Edwards and Hannah Josty
British Journal of General Practice 2005; 55 (514): 393.
Max Edwards
Roles: Specialist Registrar in Trauma and Orthopaedics
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Hannah Josty
Roles: General Practitioner
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We read with great interest the article by Linsell et al.1 The cross-sectional population-based postal survey reported the incidence and health service utilisation of 5500 Oxfordshire residents over the age of 65. The aim of the study was to investigate whether systemic differences in the primary care management of hip versus knee problems might explain the disparate rates of hip and knee joint replacements.

The National Joint Register (NJR)2 has been collecting data regarding hip and knee joint replacement in England and Wales since 1 April 2003. The NJR will quickly become the largest database collecting such data in the world. The NJR 1st Annual Report has recently been published. In the period reported, 22 672 primary total hip replacements were undertaken in comparison to 20 854 primary total knee replacements.2 This is contrary to the statement that UK rates of primary arthroplasty are considerably higher for hips than knees. We suggest that the disparity that Linsell et al proposed may be historical.

John Charnley developed total hip replacement in the 1960s, and there is evidence to suggest the prosthesis that he pioneered (still the second most commonly implanted femoral stem in England and Wales) has a 30 year survival of 88%.3 Total knee replacement implants were developed throughout the 1970s but the vast majority of early implants failed due to poor design.4 The evolution to anatomical resurfacing implants utilising soft tissues to balance the knee was a significant step forward. Current prosthesis are developed from this ideology. The AGC knee has been available since the early 1980s and has a reported 14 year survival of 97% (only 3% of knee replacements needed to be revised due to implant failure or infection).5 Many orthopaedic surgeons would argue that the longevity and success of total knee replacement is comparable to that of total hip replacement.

We suggest that the number of hip and knee replacements in England and Wales are comparable, and that the perceived success rate among those questioned is based on historical implant development. It would not, in our opinion, be unreasonable for GPs to inform their patients that the long-term results of both hip and knee replacement are excellent.

  • © British Journal of General Practice, 2005.

REFERENCES

  1. ↵
    1. Linsell L,
    2. Dawson J,
    3. Zondervan K,
    4. et al.
    (2005) Population survey comparing older adults with hip versus knee pain in primary care. Br J Gen Pract 55:192–198.
    OpenUrlAbstract/FREE Full Text
  2. ↵
    1. National Joint Registry
    , http://www.njrcentre.org.uk (accessed 11th April 2005).
  3. ↵
    1. Callaghan JJ,
    2. Templeton JE,
    3. Liu SS
    (2004) Results of Charnley total hip arthroplasty at a minimum of thirty years. A concise follow-up of a previous report. J Bone Joint Surg Am 86–A(4):690–695.
    OpenUrlAbstract/FREE Full Text
  4. ↵
    1. Moran CG,
    2. Horton TC
    (2000) Total knee replacement: the joint of the decade. A successful operation, for which there's a large unmet need. BMJ 320:820.
    OpenUrlFREE Full Text
  5. ↵
    1. Worland RL,
    2. Johnson GV,
    3. Alemparte J,
    4. et al.
    (2002) Ten to fourteen year survival and functional analysis of the AGC total knee replacement system. Knee 9:133–137.
    OpenUrlCrossRefPubMed
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British Journal of General Practice: 55 (514)
British Journal of General Practice
Vol. 55, Issue 514
May 2005
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Joint first for hip and knee replacements
Max Edwards, Hannah Josty
British Journal of General Practice 2005; 55 (514): 393.

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Joint first for hip and knee replacements
Max Edwards, Hannah Josty
British Journal of General Practice 2005; 55 (514): 393.
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Print ISSN: 0960-1643
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