Preoperative bone mineral density of the proximal tibia and migration of the tibial component after uncemented total knee arthroplasty

M M Petersen, P T Nielsen, A Lebech, S Toksvig-Larsen, B Lund

Abstract

Twenty-two patients with primary osteoarthrosis of the knee all operated on with insertion of an uncemented total knee arthroplasty had a preoperative measurement of bone mineral density (BMD) in the coronal plane of the proximal tibia performed by dual-photon absorptiometry. Postoperatively and with follow-up after 6 weeks (n = 21), 1 year (n = 22), and 3 years (n = 19), radiographs suitable for radiostereometric analysis of the tibial component migration were obtained. One year postoperatively, stress examinations were performed with the aim of measuring inducible displacement of the tibial component. Most of the migration, expressed as maximal total point motion (MTPM), occurred during the first year with an average migration of approximately 1 mm. Regression analysis showed a positive relation between BMD and MTPM after 6 weeks (P = .03, r = .47), 1 year (P = .0005, r = .68), and 3 years (P = .02, r = .54). Inducible displacement did not reveal any significant relation to BMD. MTPM between 1 and 3 years, which is the clinically most important parameter with respect to later loosening of the tibial component, showed a negative relation to BMD (P = .04, r = -.47). Thus, tibial components of knees with preoperative high tibial BMD showed less continuous migration.

OriginalsprogEngelsk
TidsskriftThe Journal of arthroplasty
Vol/bind14
Udgave nummer1
Sider (fra-til)77-81
Antal sider5
ISSN0883-5403
DOI
StatusUdgivet - jan. 1999
Udgivet eksterntJa

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