[15 years survival of the Mac-Kee Farrar metal hip prosthesis. Apropos of 58 cases and 4 explanted cups].
OBJECTIVE
Despite a high percentage of loosening (femoral, iliac or both), many surgeons have been surprised by some excellents results of Mac Kee Farrar prosthesis after 15, or even 20 years follow-up.


METHODS
37 patients (on 58) were reviewed with a follow-up of more than 15 years (48 hips). Among 17 cases followed for more than 20 years, with very good results (clinical and radiological), only one femoral loosening was observed. A part, 4 paired explanted implants (loosening at 18 years for 3 and at 21 years for one) were examined for a dimensional and metallurgic study.


RESULTS
The results showed: no wear, very good bearing surface statement and sphericity, We never observed agressive granulomatous lesions with metallic particles (metallosis), nor wear concerning the cup.


CONCLUSIONS
The peripheric design appears able to give a very good pressure repartition from cup to bone, allowing a homogeneous coat of cement with an equal thickness, and avoids loosening. Finally, we think that the progressive polar cavity in the cup, could have a great importance on lubrification, as an hydrokinetic reserve and micropump for synovial fluid.
Ray
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Clinique Orthopédique du Parc de Lyon.
D000328:Adult; D000368:Aged; D001672:Biocompatible Materials; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis / Q000009:adverse effects / Q000295:instrumentation*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D011475:Prosthesis Failure
D001672:Biocompatible Materials
Survie à plus de 15 ans de prothèses métal-métal de Mac-Kee Farrar. A propos de 58 observations et de 4 cupules explantées.