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Criteria for success with threaded cups (design, material and modularity).
H Effenberger1, M Imhof, U Witzel
1Orthopaedic University Hospital, Friedrichsheim Foundation, Frankfurt, Germany. Effengerger@implant-atlas.com
Acta Chirurgiae Orthopaedicae Et Traumatologiae Cechoslovaca
|December 13, 2003
Summary
Contemporary threaded cups, developed over three generations, show promising mid- and long-term success in cementless hip implants. Their V-cut thread design significantly enhances stability and screw-in behavior for improved patient outcomes.
Area of Science:
- Orthopedic Surgery
- Biomaterials Engineering
- Medical Device Design
Background:
- Threaded cups have evolved over three generations, becoming viable cementless hip implants.
- Certain designs demonstrate high mid- and long-term success rates.
Purpose of the Study:
- To evaluate contemporary threaded cups used in cementless hip arthroplasty.
- To analyze the design, materials, and stability of modern threaded acetabular components.
Main Methods:
- Systematic analysis and measurement of 30 second and third-generation threaded cups.
- Utilized a no-touch light section technique and half-section analysis to determine inner form construction.
Main Results:
- Approximately 50% of cups exhibit a conical shape, with a trend towards more anatomical forms.
- Conical threaded cups feature thin, constant wall thickness (1-1.8 mm); standard materials include titanium and HA coatings.
- Varied insert designs were observed, including pre-assembled, modular, total ceramic, ceramic sandwich, and metal-metal sandwich constructions.
Conclusions:
- V-cut threads demonstrate high turning moment and tilting stability, crucial for implant fixation.
- Thread design critically influences screw-in behavior, while material and surface properties impact osseointegration and long-term results.
- Three generations of development have led to current threaded cup designs with highly satisfactory mid- and long-term outcomes.