Wear and periprosthetic osteolysis in a match-paired study of modular and nonmodular uncemented acetabular cups.
The wear and prevalence of periprosthetic osteolysis at 5 to 8 years of follow-up of the Trilogy cup, which has a modular liner assembled during surgery, was compared with the Implex cup, which has a fixed liner preassembled at the factory. Sixty-three patients (65 hips) with a Trilogy cup and 64 patients (65 hips) with an Implex cup were match-paired for sex, age, height, weight, and diagnosis (osteoarthritis). All patients had a cemented stem with a 28-mm head and a successful clinical and radiographic result. After an average follow-up of 5.65 years, radiographs were studied to determine the total penetration, using the Livermore technique, and the presence of osteolysis. The average total wear in the Trilogy group was 0.47 mm (range, 0-1.95 mm); for the Implex cup, it was 0.43 mm (range, 0-1.45 mm) (P.99). One patient in each group presented with periacetabular osteolysis (P.99). There was no difference in the wear rate and prevalence of periprosthetic osteolysis between the 2 groups.
González Della Valle
Alejandro
A
The Hospital for Special Surgery, New York, New York, USA.
Su
Edwin
E
Zoppi
Adriana
A
Sculco
Thomas P
TP
Salvati
Eduardo A
EA
D000077:Acetabulum; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D010014:Osteolysis / Q000209:etiology*; D011446:Prospective Studies; D011474:Prosthesis Design; D011475:Prosthesis Failure