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

Kristin Haugan,Jomar Klaksvik,Olav A Foss,Otto S Husby

doi:10.1007/s10195-012-0187-x

Kristin Haugan, Jomar Klaksvik + Show 2 more

Open Access

https://doi.org/10.1007/s10195-012-0187-x

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Abstract

BackgroundImplant 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.Materials and methodsThirty-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.ResultsThe 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.ConclusionContinuous 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.

Highlights

Background Implant stability is considered vital to longtime implant survival in total hip arthroplasty (THA), since loose implants are reported to be a major cause of hip revision
Implant stability influences the revision rate observed in total hip arthroplasty (THA)
In the present radiostereometric analysis (RSA) study, we describe the migration pattern of the Charnley hip stem in a group of well-functioning patients at 5-year follow-up

Summary

Introduction

Implant stability influences the revision rate observed in total hip arthroplasty (THA). Major efforts have been made to reduce these numbers from the earliest days of THA. Radiostereometric analysis (RSA) has become a gold standard when measuring implant migrations with respect to the cement mantle as well as the surrounding bone [4]. RSA can describe early implant migration, and is well suited and recommended when introducing new implants into clinical use and minimizing the number of enrolled patients [5]. Implant stability is considered vital to longtime implant survival in total hip arthroplasty (THA), since loose implants are reported to be a major cause of hip revision. Materials and methods Thirty-five patients (36 hips) undergoing Charnley THA were followed with repeated clinical, radiographic, and radiostereometric analysis (RSA) over 5 years.

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