Initial Stability of Two Different Hip Revision Concepts. A Biomechanical Study

Author:

Palm L.1,Ivarsson I.1,Jacobsson S.-A.1

Affiliation:

1. Department of Orthopaedics, University Hospital, Linköping - Sweden

Abstract

Two fundamentally different revision concepts, a standard stem cemented in a bed of firmly impacted morselized bone graft, and an uncemented long stem implanted with proximal bone grafting, were compared in terms of initial stability under torsional load immediately after implantation. A stem cemented without bone graft was used as a baseline reference. The stems were implanted in identically prepared composite femora inclined at 45° and loaded vertically. During 9 individual tests of each concept, the stems displaced into retroversion with no detectable axial displacement. At a load of 1000 N the average displacement in retroversion of the prosthetic head was 3.9° ± 2.6° for the uncemented long stem and 9.1° ± 2.6° for the stem cemented in impacted morselized bone graft (P < 0.001). Both revision concepts displaced rather dramatically compared to the stem cemented without bone grafting. The magnitude of displacement may indicate insufficient initial rotational stability of both concepts particularly with the stem cemented in impacted morselized bonegraft.

Publisher

SAGE Publications

Subject

Orthopedics and Sports Medicine,Surgery

Cited by 5 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. A laboratory simulation for morselized bone graft fusion: apparent modulus under operatively based femoral impaction kinetics;Journal of Biomechanics;2005-04

2. Variables Affecting Initial Stability of Impaction Grafting for Hip Revision;Clinical Orthopaedics & Related Research;2005-03

3. Results of Hip Revision Using the Exeter Stem, Impacted Allograft Bone, and Cement;Clinical Orthopaedics and Related Research;2001-08

4. Interface biomechanics of the Anca Dual Fit hip stem: Anin vitroexperimental study;Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine;2001-06-01

5. In vitro testing of the primary stability of the VerSys enhanced taper stem: A comparative study in intact and intraoperatively cracked femora;Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine;2001-01-01

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