Abstract
The effects of a collared femoral endoprosthesis in uncemented total hip arthroplasty were evaluated in 12 dogs. This experimental study compared the biomechanic and histologic responses between collared and collarless femoral prostheses 4 months after implantation. Implant stability (micromotion) and cortical surface strain were evaluated immediately and 4 months after implantation in a simulated postoperative condition, whereas bone ingrowth, cortical porosity, and cortical remodeling were assessed after 4 months only. There were no significant differences in implant stability or cortical surface strains when the collared and collarless groups were compared acutely or after 4 months (P 〉 .05). There were also no significant differences in percent fill, bony ingrowth, or cortical geometry after 4 months (P 〉 .05). There was a significant increase in cortical porosity measured from the proximal femur after 4 months for both the collared (P = .0002) and collarless groups (P = .009) and when both groups were compared (collarless, 8.2% and collared, 5.8%; P = .03). The results suggest that a collar may be beneficial in decreasing the cortical remodeling that occurs in the proximal femoral cortex after implantation of an uncemented total hip arthroplasty.
Original language | English (US) |
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Pages (from-to) | 63-73 |
Number of pages | 11 |
Journal | Journal of Arthroplasty |
Volume | 10 |
Issue number | 1 |
DOIs | |
State | Published - 1995 |
Externally published | Yes |
Keywords
- collar
- collarless
- dog
- hip arthroplasty
- histomorphometry
ASJC Scopus subject areas
- Orthopedics and Sports Medicine