Dexa Study on Mineralization Redistribution Under the Tibial Base Plate in Total Knee Arthroplasty: 38 Knees with Minimum Five Years Follow-Up (original) (raw)

Journal of Bone and Joint Surgery-british Volume, 2005

Abstract

Purpose: After implantation of a total knee arthroplasty (TKA) for osteoarthritis, early demineralisation of the superior tibial epiphysis occurs with modification of bone mineral density (BMD) in the two compartments. The long-term trend is not known to date. We report the results of 38 prostheses followed prospectively with densitometric measurements at minimum five years. Material and methods: This prospective analysis included 38 TKA implanted for primary degenerative disease in patients with a mean age of 70±4 years at implantation, 60% women. Clinical assessment (IKS) and radiography (HKA) as well as osteodensitometry were recorded before surgery, at six months, one year, two years and five years. Bone mineral status was assessed using the densitometry of the femoral neck before surgery and at five years for all patients. The DEXA method was used for each knee on the anteroposterior film. Seven zones were defined around the tibial implant, in particular two under the medial an...

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