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Cementless hemispheric acetabular components. A 4- to 8-year follow-up report
S J Incavo1, S E Ames, F A DiFazio
1Department of Orthopaedics and Rehabilitation, McClure Musculoskeletal Research Center, College of Medicine, University of Vermont, Burlington 05405-0084, USA.
The Journal of Arthroplasty
|April 1, 1996
Summary
This study found that cementless acetabular cups showed common, nonprogressive radiolucencies, typically under 1mm. No significant complications like osteolysis or migration were observed in this 4-8 year follow-up.
Area of Science:
- Orthopedic Surgery
- Biomaterials Engineering
- Radiology
Background:
- Cementless acetabular components are widely used in hip arthroplasty.
- Assessing long-term radiographic outcomes is crucial for component survival.
- Radiolucency is a common radiographic finding around implants.
Purpose of the Study:
- To evaluate the radiographic outcomes of two cementless acetabular cup designs.
- To assess the incidence and characteristics of radiolucencies.
- To identify any complications associated with these components over 4-8 years.
Main Methods:
- Retrospective radiographic analysis of 71 cementless acetabular components (Harris-Galante and Optifix).
- Follow-up duration ranged from 4 to 8 years post-surgery.
- Analysis included assessment of radiolucency, osteolysis, migration, and fixation.
Main Results:
- Nonprogressive radiolucencies were frequent (64% Optifix, 70% Harris-Galante), mostly ≤1 mm wide and in zones 1 and 3.
- No radiolucent lines exceeded 2 mm.
- No osteolysis, screw breakage, migration, or loss of fixation surface occurred. One Harris-Galante cup had a broken locking mechanism after liner exchange.
Conclusions:
- Cementless acetabular components demonstrate a high rate of nonprogressive, thin radiolucencies.
- These findings suggest stable fixation and bone ingrowth in the majority of cases.
- Long-term radiographic surveillance is important, but significant complications were rare in this cohort.