title: Comparison of collared and collarless femoral components in primary uncemented total hip arthroplasty.
abstract: Two hundred three consecutive primary uncemented total hip arthroplasties were prospectively randomized using collared and collarless versions of an identical titanium stem. Identical 28-mm titanium heads were implanted in all cases. One hundred three collared hips were compared with 100 collarless hips. Follow-up periods averaged 45.7 months in both groups. Intraoperative, early, and late complications were similar. Hip scores, including thigh pain, at final follow-up visit were also similar. No significant differences were noted in acetabular or femoral radiolucencies, subsidence, osteolysis, or proximal femoral remodeling. At 5 years, more collarless stems revealed pedestal formation (57.1% vs 33.9%). The presence of a collar had no effect on the adequacy of fixation, proximal femoral osteopenia, or clinical scores at 5 years.
authors.affiliation: Center for Hip and Knee Surgery, Mooresville, Indiana 46158, USA.
authors.forename: J B
authors.initials: JB
authors.lastname: Meding
authors.forename: M A
authors.initials: MA
authors.lastname: Ritter
authors.forename: E M
authors.initials: EM
authors.lastname: Keating
authors.forename: P M
authors.initials: PM
authors.lastname: Faris
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002484:Cementation; D005260:Female; D005269:Femur; D005271:Femur Head Necrosis / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000601:surgery; D011446:Prospective Studies; D011474:Prosthesis Design; D016896:Treatment Outcome