RM Pressfit® cup: good preliminary results at 5 to 8 years follow-up for 189 patients.
OBJECTIVE
The RM Classic® cup shows very good results. The RM Pressfit® cup has an equatorial pressfit; it is a monoblock implant without metalback. The aim of this study was to evaluate retrospectively the survival of this implant, monitoring patients for at least 5 years in all consecutive cases operated in our centre.


METHODS
Between February 2006 and December 2008, our department performed 189 consecutive nonselected primary total hip arthroplasties using the RM® Pressfit cup, and all of these were included in the study. The operative technique involved an anterolateral approach. The latest follow-up evaluation was performed at a minimum of 5 years after the index arthroplasty.


RESULTS
The mean follow-up was 6.5 years (5-8 years). We had preoperative information for 186 of the 189 patients. 102 patients were seen in consultation (54.0%), 46 (24.3%) patients were contacted by phone, 37 (19.6%) patients died, and 4 patients (2.1%) were lost for unknown reasons. Of the 189 arthroplasties, 6 (3.2%) required revision; 4 (2.1%) for infection, 1 (0.5%) for significant haematoma with persistent deglobulisation and 1 (0.5%) for periprosthetic calcification during the 5 to 8 years following the operation. No hip was revised because of aseptic loosening. The mean annual wear rate based on the last follow-up at 5 years minimum was 0.065 mm per year. We observed no migration, 1 femoral loosening and no acetabular loosening.


CONCLUSIONS
Our study finds a good survival rate which is compatible with the 94% at 20 years with RM Classic®. These results are suggestive but must be confirmed with long-term studies.
Clermont-Ferrand University Hospital, Clermont-Ferrand - France.
Roger
R
Erivan
Clermont-Ferrand University Hospital, Clermont-Ferrand - France.
Gabriel
G
Eymond
Clermont-Ferrand University Hospital, Clermont-Ferrand - France.
Guillaume
G
Villatte
Clermont-Ferrand University Hospital, Clermont-Ferrand - France.
Aurélien
A
Mulliez
Clermont-Ferrand University Hospital, Clermont-Ferrand - France.
Galvin
G
Myriam
Clermont-Ferrand University Hospital, Clermont-Ferrand - France.
Stéphane
S
Descamps
Clermont-Ferrand University Hospital, Clermont-Ferrand - France.
Stéphane
S
Boisgard
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000209:etiology / Q000601:surgery*; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012086:Reoperation; D012189:Retrospective Studies; D013997:Time Factors; D016896:Treatment Outcome