Progressive femoral cortical and cancellous bone density loss after uncemented tapered-design stem fixation

Autor:	Tobias E. Nowak, David Pfander, Lutz Arne Mueller, Michael Voelk, Alexander Kress, Lars P. Mueller, Raimund Forst, Lothar Haeberle, Rainer Schmidt
Rok vydání:	2010
Předmět:	business.industry Periprosthetic General Medicine Anatomy medicine.disease Osteopenia Diaphysis medicine.anatomical_structure medicine Orthopedics and Sports Medicine Surgery Cortical bone Femur Implant business Cancellous bone Fixation (histology)
Zdroj:	Acta Orthopaedica. 81:171-177
ISSN:	1745-3682 1745-3674
DOI:	10.3109/17453671003635843
Popis:	Background Aseptic implant loosening and periprosthetic bone loss are major problems after total hip arthroplasty (THA). We present an in vivo method of computed tomography (CT) assisted osteodensitometry after THA that differentiates between cortical and cancellous bone density (BD) and area around the femoral component.Method Cortical and cancellous periprosthetic femoral BD (mg CaHA/mL), area (mm2) and contact area between the prothesis and cortical bone were determined prospectively in 31 patients 10 days, 1 year, and 6 years after uncemented THA (mean age at implantation: 55 years) using CT-osteodensitometry.Results 6 years postoperatively, cancellous BD had decreased by as much as 41% and cortical BD by up to 27% at the metaphyseal portion of the femur; this decrease was progressive between the 1-year and 6-year examinations. Mild cortical hypertrophy was observed along the entire length of the diaphysis. No statistically significant changes in cortical BD were observed along the diaphysis of the st...
Databáze:	OpenAIRE
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