Three-dimensional primary stability of cementless femoral stems

Bühler, D W; Berlemann, U; Lippuner, K; Jaeger, P; Nolte, L P (1997). Three-dimensional primary stability of cementless femoral stems. Clinical biomechanics, 12(2), pp. 75-86. Kidlington, UK: Elsevier 10.1016/S0268-0033(96)00059-9

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OBJECTIVE: This study investigates by means of a new bone-prosthesis interface motion detector whether conceptual design differences of femoral stems are reflected in their primary stability pattern. DESIGN: An in vitro experiment using a biaxial materials testing machine in combination with three-dimensional motion measurement devices was performed. BACKGROUND: Primary stability of uncemented total hip replacements is considered to be a prerequisite for the quality of bony ongrowth to the femoral stem. Dynamic motion as a response to loading as well as total motion of the prosthesis have to be considered under quasi-physiological cyclic loading conditions. METHODS: Seven paired fresh cadaveric femora were used for the testing of two types of uncemented femoral stems with different anchoring concepts: CLS stem (Spotorno) and Cone Prosthesis (Wagner). Under sinusoidal cyclic loading mimicking in vivo hip joint forces a new measurement technique was applied allowing for the analysis of the three-dimensional interface motion. RESULTS: Considerable differences between the two prostheses could be detected both in their dynamic motion and total motion behaviour. Whereas the CLS stem, due to the wedge-shaped concept, provides smaller total motions, the longitudinal ribs of the Cone prostheses result in a substantially smaller dynamic motion. CONCLUSIONS: The measuring technique provided reliable and accurate data illustrating the three-dimensional interface motion of uncemented femoral stems.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of Orthopaedic, Plastic and Hand Surgery (DOPH) > Clinic of Osteoporosis
UniBE Contributor:	Lippuner, Kurt
ISSN:	0268-0033
Publisher:	Elsevier
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 15:24
Last Modified:	05 Dec 2022 14:26
Publisher DOI:	10.1016/S0268-0033(96)00059-9
PubMed ID:	11415676
Web of Science ID:	A1997WN73400001
URI:	https://boris.unibe.ch/id/eprint/37874 (FactScience: 212061)