title: Survivorship of rough-surfaced threaded acetabular cups. 382 consecutive primary Zweymüller cups followed for 0.2-12 years.
abstract: We studied prospectively 382 cementless (Zweymüller stem) and hybrid (cemented stem) primary total hip replacements and used a cementless grit-blasted titanium alloy threaded cup. After a median 5 (0.2-12) year follow-up, 1 cup was exchanged, 2 cups were removed for deep sepsis, and 3 cups showed definite loosening; of these, 2 subsequently required revision. Actuarial calculation methods indicated a 10-year survivorship of 99% with cup retrieval for any cause (clinical failure), definite cup-loosening (radiographic failure), and revision for aseptic cup-loosening as endpoints. These intermediate results exceed those from smooth-surfaced screw rings and compare favorably with those from cemented cups and cementless, press-fit, metal-backed cups.
authors.affiliation: Clinique de l'Yvette, Longjumeau, France.
authors.forename: C P
authors.initials: CP
authors.lastname: Delaunay
authors.forename: A I
authors.initials: AI
authors.lastname: Kapandji
mesh_terms: D000077:Acetabulum; D000206:Actuarial Analysis; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000497:Alloys; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D001843:Bone Cements / Q000627:therapeutic use; D005260:Female; D006622:Hip Prosthesis / Q000009:adverse effects / Q000592:standards*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012086:Reoperation; D013499:Surface Properties; D016019:Survival Analysis; D014025:Titanium / Q000627:therapeutic use
chemical_list: D000497:Alloys; D001843:Bone Cements; C031462:titanium alloy (TiAl6V4); D014025:Titanium