A comparison of the penetration rate of two polyethylene acetabular liners of different levels of cross-linking. A prospective randomised trial.
We carried out a prospective randomised study designed to compare the penetration rate of acetabular polyethylene inserts of identical design but different levels of cross-linking at a minimum of four years follow-up. A total of 102 patients (102 hips) were randomised to receive either highly cross-linked Durasul, or contemporary Sulene polyethylene inserts at total hip replacement. A single blinded observer used the Martell system to assess penetration of the femoral head. At a mean follow-up of 4.9 years (4.2 to 6.1) the mean femoral head penetration rate was 0.025 mm/year (SD 0.128) in the Durasul group compared with 0.106 mm/year (SD 0.109) in the Sulene group (Mann-Whitney test, p = 0.0027). The mean volumetric penetration rate was 29.24 mm(3)/year (SD 44.08) in the Durasul group compared with 53.32 mm(3)/year (SD 48.68) in the Sulene group. The yearly volumetric penetration rate was 55% lower in the Durasul group (Mann-Whitney test, p = 0.0058). Longer term results are needed to investigate whether less osteolysis will occur.
Triclot
P
P
Clinical Orthopaedic Research Centre, Paris, France.
Grosjean
G
G
El Masri
F
F
Courpied
J P
JP
Hamadouche
M
M
D000077:Acetabulum / Q000502:physiology / Q000601:surgery*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015992:Body Mass Index; D019544:Equipment Failure Analysis; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D020959:Polyethylene / Q000032:analysis / Q000378:metabolism / Q000627:therapeutic use*; D011183:Postoperative Complications; D011474:Prosthesis Design / Q000592:standards; D016037:Single-Blind Method; D018709:Statistics, Nonparametric; D016896:Treatment Outcome
D020959:Polyethylene