Anna Stefánsdóttir, Herbert Franzén, Ragnar Johnsson, Ewald Ornstein, Martin Sundberg
{"title":"Movement pattern of the Exeter femoral stem; a radiostereometric analysis of 22 primary hip arthroplasties followed for 5 years..","authors":"Anna Stefánsdóttir, Herbert Franzén, Ragnar Johnsson, Ewald Ornstein, Martin Sundberg","doi":"10.1080/00016470410001169-1","DOIUrl":null,"url":null,"abstract":"<p><strong>Background: </strong>The design of the Exeter stem may facilitate distal migration, but radiostereometric analysis (RSA) studies have been limited to 2 years of follow-up.</p><p><strong>Patients and methods: </strong>We followed migration of the Exeter femoral stems in 22 primary hip arthroplasties for 5 years with RSA.</p><p><strong>Results: </strong>All stems migrated distally and the median migration at 2 years was 1.34 mm, while at 5 years it was 1.77 mm. 7 stems migrated above accuracy between 3 and 5 years. (RSA) evaluation of the cement mantle could be performed in 14 cases, and in 5 slight migration was found. Most of the stems rotated towards retroversion and the median rotation at 2 years was 1.2 degrees, while at 5 years it was 1.6 degrees. We found 1 patient with impending clinical failure but no deviation in the RSA migration pattern, and 1 patient with unstable migration pattern but no clinical symptoms.</p><p><strong>Interpretation: </strong>We found a greater distal migration of the Exeter stem for longer periods of time than seen with other types of cemented implants.</p>","PeriodicalId":75403,"journal":{"name":"Acta orthopaedica Scandinavica","volume":"75 4","pages":"408-14"},"PeriodicalIF":0.0000,"publicationDate":"2004-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00016470410001169-1","citationCount":"61","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta orthopaedica Scandinavica","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1080/00016470410001169-1","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 61
Abstract
Background: The design of the Exeter stem may facilitate distal migration, but radiostereometric analysis (RSA) studies have been limited to 2 years of follow-up.
Patients and methods: We followed migration of the Exeter femoral stems in 22 primary hip arthroplasties for 5 years with RSA.
Results: All stems migrated distally and the median migration at 2 years was 1.34 mm, while at 5 years it was 1.77 mm. 7 stems migrated above accuracy between 3 and 5 years. (RSA) evaluation of the cement mantle could be performed in 14 cases, and in 5 slight migration was found. Most of the stems rotated towards retroversion and the median rotation at 2 years was 1.2 degrees, while at 5 years it was 1.6 degrees. We found 1 patient with impending clinical failure but no deviation in the RSA migration pattern, and 1 patient with unstable migration pattern but no clinical symptoms.
Interpretation: We found a greater distal migration of the Exeter stem for longer periods of time than seen with other types of cemented implants.