Peer-reviewed veterinary case report
Bone growth into cementless hip implants in large breed dogs
By Lauer, Susanne K et al.·Published in Veterinary surgery : VS·2009·Department of Veterinary Clinical Sciences, United States·View original on PubMed →
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Original publication title: Descriptive histomorphometric ingrowth analysis of the Zurich cementless canine total hip acetabular component.
- Species:
- dog
Plain-English summary
A group of large breed dogs underwent total hip replacement surgery to treat hip dysplasia and were monitored for bone growth into the hip implant over a year. The dogs showed varying degrees of bone contact with the implant's outer surface, with significant growth noted as early as two months after surgery. However, most of the inner part of the implant remained empty throughout the study. The results suggest that while bone growth into the implant is possible, the presence of radiographic lucency (dark areas on X-rays) does not indicate how well the bone is integrating with the implant.
People also search for: dog hip replacement recovery · large breed dog hip dysplasia treatment · total hip replacement for dogs
Abstract
OBJECTIVES: To (1) determine bone contact with the outer surface and ingrowth into the perforated outer shell of the Kyon acetabular component at 2, 6, and 12 months after total hip replacement (THR) and (2) determine correlation between radiographic lucency surrounding the cup-bone interface and bone contact and ingrowth. STUDY DESIGN: Experimental study. ANIMALS: Large breed dogs (n=11) with and without hip dysplasia. METHODS: Force platform gait analysis was performed preoperatively and 2, 6, and 12 months after THR. Curvilinear length of lucency (CLL) was measured on pelvic radiographs. Tissue contact with the outer cup and ingrowth into the cup were determined histomorphometrically at 2, 6, and 12 months. RESULTS: Peak vertical force and vertical impulse of the treated and control hind limb were not significantly different at any time. Median bone contact with the outer cup surface was 77%, 48%, and 76% at 2, 6, and 12 months, respectively. Median bone ingrowth into the cup perforations was 50%, 20%, and 44% at 2, 6, and 12 months, respectively. Median bone ingrowth to the inner cup surface was minimal at any time. CLL did not correlate with bone ingrowth. CONCLUSIONS: Bone ingrowth into cup perforations occurred in each dog and was already present 2 months after THR, but most of the inner cup space remained vacant. CLINICAL RELEVANCE: Radiographic lucency surrounding the cup-bone interface does not allow assessment of bone contact with the outer surface or bone ingrowth into the Kyon cup in dogs without clinical problems.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/19152618/