The fixation of the cemented femoral component - Effects of stem stiffness, cement thickness and roughness of the cement-bone surface

After cemented total hip arthroplasty (THA) there may be failure at either the cement-stem or the cement-bone interface. This results from the occurrence of abnormally high shear and compressive stresses within the cement and excessive relative micromovement. We therefore evaluated micromovement and stress at the cement-bone and cement-stem interfaces for a titanium and a chromium-cobalt stem. The behaviour of both implants was similar and no substantial differences were found in the size and distribution of micromovement on either interface with respect to the stiffness of the stem. Micromovement was minimal with a cement mantle 3 to 4 mm thick but then increased with greater thickness of the cement. Abnormally high micromovement occurred when the cement was thinner than 2 mm and the stem was made of titanium. The relative decrease in surface roughness augmented slipping but decreased debonding at the cement-bone interface. Shear stress at this site did not vary significantly for the different coefficients of cement-bone friction while compressive and hoop stresses within the cement increased slightly.


Published in:
Journal of Bone and Joint Surgery-British Volume, 82B, 2, 297-303
Year:
2000
ISSN:
0301-620X
Keywords:
Note:
Rakotomanana, LR Orthoped Hosp, Ave Pierre Decker 4, CH-1005 Lausanne, Switzerland Orthoped Hosp, CH-1005 Lausanne, Switzerland 294NQ Times Cited:31 Cited References Count:46
Laboratories:




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