A proximal femoral implant preserves physiological bone deformation: a biomechanical investigation in cadaveric bones.
The aim of this study was to compare the perturbances in bone deformation patterns of the proximal femur due to a conventional cemented femoral stem and a novel uncemented implant designed on the principles of osseointegration. Five matched pairs of fresh frozen human femora were mechanically tested. Bone deformation patterns, measured with a video digitizing system under 1.5 kN joint force, showed that the cemented Spectron femoral implant caused significant alterations to the proximal femoral deformation pattern, whereas the Gothenburg osseointegrated titanium femoral implant did not significantly alter the bone behaviour (p < 0.05). Vertical micromotions measured under 1 kN after 1000 cycles were within the threshold of movement tolerable for bone ingrowth (21 microm for the Gothenburg system and 26 microm for the cemented implant).
Macdonald
W
W
Department of Biomaterials/Handicap Research, Institute for Surgical Sciences, University of Gothenburg, Gothenburg, Sweden.
Carlsson
L V
LV
Jacobsson
C M
CM
Lee
T Q
TQ
D001696:Biomechanical Phenomena; D002102:Cadaver; D002484:Cementation / Q000009:adverse effects / Q000379:methods*; D004548:Elasticity; D019544:Equipment Failure Analysis / Q000379:methods; D005269:Femur / Q000503:physiopathology* / Q000601:surgery; D006621:Hip Joint / Q000503:physiopathology; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D066298:In Vitro Techniques; D007593:Joint Instability / Q000209:etiology* / Q000503:physiopathology*; D009038:Motion; D011475:Prosthesis Failure; D011786:Quality Control; D012016:Reference Values; D012680:Sensitivity and Specificity; D013314:Stress, Mechanical; D016474:Weight-Bearing