Abstract
The aim of this retrospective study was to determine whether prior regional osteoporosis in the knee associates the 10-year outcome of total knee arthroplasty (TKA) in patients with rheumatoid arthritis (RA). About 63 knees of 45 RA patients underwent cruciate-retaining Deltafit TKA. Overall, long-term results of the RA disease activity were based on dual-energy X-ray absorptiometry (DXA) to evaluate osteoporosis; the Japanese Orthopedic Association (JOA) functional knee score, a disease activity score of 28 joints; and the neck large joint score 12 for joint destruction, which were investigated over 10 years. Multivariate analysis of factors affecting the JOA score at 10 years was performed. Factors affecting the JOA score at 10 years correlated with the DXA results at the distal femoral condyle, patient age, and neck large joint score 12. Prior regional osteoporosis in the knee based on DXA negatively correlated the 10-year outcome of TKA in patients with RA.
Highlights
The clinical survival of arthroplasty is affected by osteoporosis detected on dual-energy X-ray absorptiometry (DXA) as a standard measure of bone strength and quality
Of the independent variables evaluated, DXA (FC), patient age, and pre-total knee arthroplasty (TKA) NLJ score 12 significantly correlated with the Japanese Orthopedic Association (JOA) score at 10 years after TKA (Table 2)
The multivariate analysis revealed that the significant factors of the 10-year clinical outcome of TKA in rheumatoid arthritis (RA) were the DXA results of the femoral condyle (FC), patient age, and the pre-TKA NLJ score 12, with DXA findings being the highly correlated factor
Summary
The clinical survival of arthroplasty is affected by osteoporosis detected on dual-energy X-ray absorptiometry (DXA) as a standard measure of bone strength and quality. The JOA score was assessed for both knee joints at the time of each TKA and 10 years after TKA.
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