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Acetabular screw rings and surface treatment
1Department of Orthopaedic Surgery, Clinique de l'Yvette, Longjumeau, France.
Clinical Orthopaedics and Related Research
|July 1, 1997
Summary
This study shows grit-blasted titanium hip implants provide excellent long-term stability and function. Improved surface roughness enhances bone ingrowth, significantly reducing loosening and wear in total hip arthroplasty.
Area of Science:
- Orthopedic Surgery
- Biomaterials Engineering
- Medical Device Design
Background:
- Threaded components in total hip arthroplasty (THA) have historically faced challenges with initial stability and long-term osseointegration.
- Previous designs with smooth surfaces demonstrated suboptimal bone ingrowth, leading to component loosening and revision surgeries.
Purpose of the Study:
- To evaluate the midterm clinical and radiographic outcomes of primary total hip arthroplasties utilizing Zweymüller truncated self-tapered threaded rings made of pure titanium with a grit-blasted surface.
- To assess the implant stability, functional improvement, wear characteristics, and survivorship of these titanium implants over a minimum 5-year follow-up period.
Main Methods:
- Prospective study of 167 primary total hip arthroplasties using Zweymüller threaded titanium components with a 3- to 5-mu grit blasted surface.
- Clinical assessment using the modified Harris hip score and radiographic evaluation for bone-to-implant gap, migration, and loosening.
- Analysis of wear rates and survivorship, with specific attention to failure modes like loosening and osteolysis.
Main Results:
- High success rate with 98.7% survivorship at 9- to 10-year follow-up, with no observed delayed loosening or osteolysis.
- Significant improvement in mean modified Harris hip score from 44.4 preoperatively to 91 at 7 years average follow-up.
- Bone-to-implant gap decreased from 54.7% post-surgery to 2.4% at final review, indicating successful osseointegration.
Conclusions:
- The grit-blasted surface of the titanium threaded ring significantly enhances bone ingrowth and osseointegration, leading to superior midterm results compared to smooth-surfaced components.
- This implant design demonstrates excellent stability, functional recovery, and longevity in primary total hip arthroplasty.
- The surface topography is crucial for the success of screw-in fixation mechanisms in cementless hip implants.