ABSTRACT
OBJECTIVE: To describe the clinical and radiographic features of septic and aseptic failure of two femoral endoprostheses and their successful revision. STUDY DESIGN: Case report. ANIMALS OR SAMPLE POPULATION: Two skeletally mature male research dogs. METHODS: An uncemented porous-coated anatomic (PCA) endoprosthesis was implanted in a single-stage revision procedure after thorough debridement and lavage of the femoral canal. An autogenous cancellous bone graft was used in dog 2 (aseptic loosening). Serial clinical and radiographic examinations were performed postoperatively. The dogs were euthanatized 1 year (dog 1) and 2 years (dog 2) after revision surgery, and necropsy was performed. High-resolution contact radiographs and histopathologic evaluation of femoral sections were obtained. RESULTS: The cause of implant failure was septic loosening in dog 1 and aseptic loosening in dog 2. In both dogs, clinical function returned to normal after revision. Serial radiographic assessment after revision documented disappearance of the bone pedestal and the periprosthetic lucency. Cancellous hypertrophy seen adjacent to the proximal porous-coated region of the implants provided radiographic evidence of bony fixation. Histological evaluation of femoral sections documented successful implant integration with bone and fibrous tissue. CONCLUSION: Revision with an uncemented implant in a single-stage procedure was successful in the two dogs described in this report. CLINICAL RELEVANCE: This report provides a detailed description of the clinical course and serial radiographic assessment of septic and aseptic loosening of two femoral endoprostheses. Single-stage revision is a potential treatment for either condition as demonstrated by the successful outcome in these two dogs.
Subject(s)
Arthroplasty, Replacement, Hip/veterinary , Dogs/surgery , Hip Prosthesis/veterinary , Animals , Hip Joint/diagnostic imaging , Hip Joint/pathology , Male , RadiographyABSTRACT
Thirty uncemented porous-coated anatomic total hip prostheses in 24 dogs were evaluated radiographically at 6 months, 12 months, or 18 months after arthroplasty. All dogs were fully weight bearing and free of lameness at the time of follow-up. Radiographs were assessed for prosthetic component alignment, percentage of femoral canal fill, resorptive and formative bony changes, and changes at the implant bone interface. No evidence of infection, loosening, or failure of component fixation was seen. Settling of the acetabular component and subsidence of the femoral stem was seen early after surgery. Cortical atrophy was seen in all femurs and was the most significant bony remodeling change. Early results of clinical and radiographic evaluation of uncemented total hip arthroplasty in dogs have been encouraging.
Subject(s)
Dogs/surgery , Hip Joint/diagnostic imaging , Hip Prosthesis/veterinary , Animals , Bone Remodeling , Bone Resorption/diagnostic imaging , Bone Resorption/etiology , Bone Resorption/veterinary , Bone and Bones/pathology , Evaluation Studies as Topic , Female , Follow-Up Studies , Hypertrophy/veterinary , Male , Prospective Studies , Radiography , Treatment OutcomeABSTRACT
Histomorphometric analysis of bone ingrowth into a porous-coated acetabular component was evaluated in a canine model. A total of nine prostheses were evaluated, 3 at 6 months, 3 at 12 months, and 3 at 24 months after implantation. All implants were grossly stable at the time of retrieval. The mean percentage of bone ingrowth was 12% at 6 months, 24% at 12 months, and 24% at 24 months. Narrow radiolucent lines noted on microradiographs were more evident at the 6 month time period than at the 12 or 24 month time periods. Bone ingrowth into a porous-coated acetabular component in a weight-bearing model may continue beyond the 6 month time period, and early evaluation of bone ingrowth may underestimate final bone ingrowth.
Subject(s)
Acetabulum/physiology , Dogs/physiology , Hip Prosthesis/veterinary , Osseointegration , Acetabulum/anatomy & histology , Acetabulum/diagnostic imaging , Animals , Cementation , Disease Models, Animal , Dogs/anatomy & histology , Dogs/surgery , Microradiography , Prosthesis DesignABSTRACT
A zonal analysis system and corresponding nomenclature were developed to describe the location and nature of radiographic changes in canine uncemented total hip arthroplasties. Criteria to assess prosthetic component alignment, percentage of femoral canal fill, resorptive and formative bony changes, and alterations in the bone at the implant-bone interface were derived by studying serial radiographs of 100 consecutive canine uncemented total hip arthroplasties for up to 30 months after surgery.
Subject(s)
Bone Remodeling , Dogs/surgery , Hip Joint/diagnostic imaging , Hip Prosthesis/veterinary , Animals , RadiographyABSTRACT
Oral swabs of 73 HIV-1 infected men (32 under conditions of antimycotic treatment (43.8%)) and 58 controls were cultured for Candida species and Enterobacteriaceae. In Group A without antimycotics, yeasts were isolated from 35/41 swabs (85.4%) (range 2 x 10(1) - 4 x 10(6) cfu/ml). In Group B with antimycotics, yeasts were cultured from 27/32 swabs (84.4%) (4 x 10(1) - 1 x 10(6) cfu/ml). Oral Enterobacteriaceae (o.e.) were grown from 22% of the swabs of both Group A (2 x 10(1) - 2 x 10(6) cfu/ml) and Group B (4 x 10(1) - 1.6 x 10(6) cfu/ml). Growth of o.e. and yeasts (2 x 10(3) - 4 x 10(6) cfu/ml). Correlation between yeasts and o.e. were isolated in 14% (2 x 10(1) - 6.4 x 10(6) cfu/ml). Correlation between yeasts species to local and systemic treatment deserves further investigations.
