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Short Term Outcomes of a Hydroxyapatite Coated Metal Backed Patella
Scott R Nodzo1, Donald W Hohman1, Allison S Hoy1
1University at Buffalo Department of Orthopedics Buffalo, New York.
The Journal of Arthroplasty
|March 16, 2015
Summary
This study compared hydroxyapatite coated patella (HAP) implants to cemented polyethylene patella (CP) implants. Both showed similar early clinical outcomes, but HAP implants may cause stress shielding, necessitating long-term durability assessment.
Area of Science:
- Orthopedic surgery
- Biomaterials science
- Radiology
Background:
- Patellar component selection is crucial in total knee arthroplasty.
- Hydroxyapatite coated (HAP) uncemented patellar components offer potential biological fixation advantages.
- Cemented polyethylene patella (CP) components are a traditional standard.
Purpose of the Study:
- To compare the early clinical outcomes and radiographic findings of HAP versus CP patellar components.
- To evaluate the incidence of stress shielding with HAP patellar components.
Main Methods:
- Retrospective review of 101 knees with HAP and 50 knees with CP patellar components.
- Minimum two-year clinical follow-up.
- Radiographic assessment for bone density changes around patellar pegs.
Main Results:
- No patellar revisions were required in either group during the study period.
- Similar clinical outcomes were observed between HAP and CP groups at final follow-up.
- Forty-five percent of HAP knees showed 1-2mm decreased trabecular bone density around pegs, suggestive of stress shielding, not seen in CP knees.
Conclusions:
- Uncemented HAP patellar components demonstrate satisfactory early clinical outcomes.
- The observed stress shielding in HAP components warrants further investigation.
- Long-term follow-up is essential to ascertain the durability and longevity of HAP patellar implants.
