In vitro testing of the primary stability of the VerSys enhanced taper stem: A comparative study in intact and intraoperatively cracked femora

Author:

Monti L1,Cristofolini L1,Toni A1,Ceroni R G2

Affiliation:

1. Istituti Ortopedici Rizzoli Laboratorio di Tecnologia Medica Bologna, Italy

2. Istituti Ortopedico Galeazzi I Divisione Milan, Italy

Abstract

The Zimmer VerSys enhanced taper uncemented stem was tested in vitro for primary stability. Six stems were implanted in six composite femora. Three femora were unintentionally damaged by cracking of the bone during stem insertion and press-fit. A previously validated protocol was used to load the specimens cyclically and to record locally the rotational and axial bone/implant relative motions in terms of elastic motion and permanent migration. For the undamaged femora, the VerSys stem showed excellent primary stability, in terms of both elastic motions (less than 9 μm) and permanent migrations (less than 6 μm), and in both axial and rotational directions, comparing favorably with the literature. Intraoperatively-induced proximal cracks did influence the primary stability of the stem in terms of permanent migration. As cracks may easily be produced in the diaphyseal canal during insertion of cementless stems, which rely for primary stability on conical fitting into the canal, great care must be taken in preparation of the canal and insertion of the stem.

Publisher

SAGE Publications

Subject

Mechanical Engineering,General Medicine

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2. Measures of micromotion in cementless femoral stems-review of current methodologies;Biomaterials and Biomechanics in Bioengineering;2016-06-25

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