The migration pattern of the Charnley femoral stem: a five-year follow-up RSA study in a well-functioning patient group.

Journal of Orthopaedics and Traumatology : Official Journal of the Italian Society of Orthopaedics and Traumatology
Kristin HauganOlav A Foss

Abstract

Implant stability is considered vital to long-time implant survival in total hip arthroplasty (THA), since loose implants are reported to be a major cause of hip revision. There is an association between early implant micromotion and increased risk of revision. More implant-specific data are needed to establish acceptable levels of early implant movement. Thirty-five patients (36 hips) undergoing Charnley THA were followed with repeated clinical, radiographic, and radiostereometric analysis (RSA) over 5 years. Twenty-three patients attended 5 years postoperatively. The patient group was well functioning based on the radiological and clinical evaluations. The stems constantly moved up to 5 years postoperatively, with subsidence, retroversion, and varus tilt, based on the RSA. Continuous movement of the Charnley stem was observed up to 5 years postoperatively in a well-functioning patient group. The migration data presented herein could be useful when defining acceptable migration limits for certain types of cemented femoral stems.

References

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Citations

Sep 26, 2015·International Orthopaedics·Stefan BuddeFritz Thorey
Jul 15, 2016·Biomedizinische Technik. Biomedical Engineering·Stefan SesselmannThomas Wierer

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Methods Mentioned

BETA
total hip arthroplasty
RSA
lavage
X-ray
RSAs

Software Mentioned

SmartSet
SAS
UmRSA

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