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Proximal ingrowth components.
1Texas Center for Joint Replacement, 5940 West Parker, Suite 100, Plano, TX 75093, USA.
Clinical Orthopaedics and Related Research
|April 2, 2004
Summary
Proximal ingrowth hip revision components restore femur load, showing improved survivorship and clinical outcomes in newer designs. These titanium implants offer a 92.7% 11-year survival rate in revision surgeries.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
- Medical Device Engineering
Background:
- Proximal ingrowth hip revision components aim to restore physiologic load to the femur.
- Early designs had limited survivorship and clinical outcomes, but newer generations show significant improvement.
- Titanium is preferred for its bone affinity and low modulus of elasticity.
Purpose of the Study:
- To evaluate the survivorship and clinical outcomes of a specific calcar replacement long stem hip revision component.
- To assess bone ingrowth, radiographic stress shielding, and calcar healing with this implant design.
Main Methods:
- A consecutive series of 107 hip revisions using a calcar replacement long stem design was reviewed.
- Survivorship, bone ingrowth, radiographic stress shielding, and calcar healing were assessed over 11 years.
Main Results:
- The study achieved an overall 11-year survivorship of 92.7%.
- Bone ingrowth was successful in all but two components.
- Radiographic stress shielding was observed in 11.4% of cases, with 42.6% showing some calcar healing.
Conclusions:
- This calcar replacement long stem design demonstrates good survivorship and bone ingrowth for hip revisions.
- The implant is suitable for most revision scenarios requiring adequate proximal femur support, potentially with allograft.
- Achieving a tight fit in the femoral isthmus and proximal fill is crucial for success, with modularity aiding this process.