Logo of The Journal of Bone & Joint Surgery (Br)
Quick search:        
          Advanced Search
Guest Access | Sign In
Journal of Bone and Joint Surgery - British Volume, Vol 91-B, Issue 9, 1158-1163.
doi: 10.1302/0301-620X.91B9.22023  
Copyright © 2009 by British Editorial Society of Bone and Joint Surgery
This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow My Folders
Right arrow Download to citation manager
Google Scholar
Right arrow Articles by Clauss, M.
Right arrow Articles by Ilchmann, T.
PubMed
Right arrow PubMed Citation
Right arrow Articles by Clauss, M.
Right arrow Articles by Ilchmann, T.

Fixation and loosening of the cemented Müller straight stem

A LONG-TERM CLINICAL AND RADIOLOGICAL REVIEW

M. Clauss, MD, Orthopaedic Surgeon1; M. Luem, BSc, Clinical Research Associate1; P. E. Ochsner, MD, Professor, Former Head of Department1; and T. Ilchmann, MD, PhD, Orthopaedic Surgeon1

1 Department of Orthopaedic Surgery, Kantonsspital Liestal, Rheinstrasse 26, CH 4410, Liestal, Switzerland.

Correspondence should be sent to Dr M. Clauss; e-mail: martin.clauss{at}ksli.ch

The original forged Müller straight stem (CoNiCr) has shown excellent ten- to 15-year results. We undertook a long-term survival analysis with special emphasis on radiological changes within a 20-year period of follow-up.

In all, 165 primary total hip replacements, undertaken between July 1984 and June 1987 were followed prospectively. Clinical follow-up included a standardised clinical examination, and radiological assessment was based on a standardised anteroposterior radiograph of the pelvis, which was studied for the presence of osteolysis, debonding and cortical atrophy.

Survival of the stem with revision for any reason was 81% (95% confidence interval (CI), 76 to 86) at 20 years and for aseptic loosening 87% (95% CI, 82 to 90). At the 20-year follow-up, 15 of the surviving 36 stems showed no radiological changes. Debonding (p = 0.005), osteolysis (p = 0.003) and linear polyethylene wear (p = 0.016) were associated with aseptic loosening, whereas cortical atrophy was not associated with failure (p = 0.008).

The 20-year results of the Müller straight stem are comparable to those of other successful cemented systems with similar follow-up. Radiological changes are frequently observed, but with a low incidence of progression, and rarely result in revision. Cortical atrophy appears to be an effect of ageing and not a sign of loosening of the femoral component.






(c) British Editorial Society of Bone and Joint Surgery All Rights Reserved
Registered charity no: 209299     Print ISSN: 0301-620X
Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General