Volume 3, Issue 5, September 2017, Page: 66-70
The Trochanteric Wing of the Zweymüller Femoral Stem does Not Affect Rotational Stability: An Experimental Study Using a Resin Bone Model
Tomonori Shigemura, Department of Orthopaedic Surgery, Teikyo University Chiba Medical Center, Ichihara City, Japan
Takanori Omae, Department of Orthopaedic Surgery, Sanmu Medical Center, Sanmu City, Japan
Shigeru Mitsuhashi, Department of Orthopaedic Surgery, Narashino Dai-ichi Hospital, Narashino City, Japan
Yasuaki Murata, Department of Orthopaedic Surgery, Teikyo University Chiba Medical Center, Ichihara City, Japan
Yohei Yamamoto, Department of Orthopaedic Surgery, Teikyo University Chiba Medical Center, Ichihara City, Japan
Takashi Sato, Department of Orthopaedic Surgery, Teikyo University Chiba Medical Center, Ichihara City, Japan
Ryuto Tsuchiya, Department of Orthopaedic Surgery, Teikyo University Chiba Medical Center, Ichihara City, Japan
Yuichi Wada, Department of Orthopaedic Surgery, Teikyo University Chiba Medical Center, Ichihara City, Japan
Hiroyuki Takahashi, Department of Engineering, Teijin Nakashima Medical Co., Ltd, Okayama City, Japan
Michihiro Fujiwara, Department of Engineering, Teijin Nakashima Medical Co., Ltd, Okayama City, Japan
Received: Jun. 28, 2017;       Accepted: Jul. 17, 2017;       Published: Oct. 23, 2017
DOI: 10.11648/j.ijcems.20170305.13      View  1862      Downloads  61
Abstract
The Preserve stem is a modified Zweymüller femoral stem that omits the trochanteric wing. Omission of the trochanteric wing of the prosthesis might influence its rotational stability, but, there are no reports about the rotational stability of a modified Zweymüller femoral stem. The purpose of this study was to investigate the effect of the trochanteric wing on rotational stability by comparing the modified Zweymüller femoral stem and the original Zweymüller femoral stem. Computed tomography of the right femur was used to construct a resin model of the proximal femur. Three types of uncemented stems were used in this study: Preserve α, β, and exemplary Zweymüller stem. Preserve β is a modified Zweymüller-type of stem with a reduced trochanteric wing. Preserve α is also a Zweymüller-type of stem with a further reduced trochanteric wing. The resin bone model was mounted on a universal testing machine. The stem was inserted into the bone model manually and loaded vertically up to 600 N. Then the stem was rotated posteriorly by 1°/sec until angular rotation was achieved to 5°. The torque at 5° was compared among the three stems. Vertical displacement of the stem during rotation testing was also recorded as a correlative measure for prosthetic subsidence. The results showed that the mean torque at 5° was not significantly different among the Preserve α, β, and exemplary Zweymüller stem (Tukey-Kramer test). Furthermore, the mean vertical displacement amounts during rotation testing were not significantly different among the three stems (Tukey-Kramer test). This study indicate that the Preserve α and β, modified Zweymüller stems, are rotationally as stable as the exemplary Zweymüller stem.
Keywords
Rotational Stability, Zweymüller Stem, Trochanteric Wing
To cite this article
Tomonori Shigemura, Takanori Omae, Shigeru Mitsuhashi, Yasuaki Murata, Yohei Yamamoto, Takashi Sato, Ryuto Tsuchiya, Yuichi Wada, Hiroyuki Takahashi, Michihiro Fujiwara, The Trochanteric Wing of the Zweymüller Femoral Stem does Not Affect Rotational Stability: An Experimental Study Using a Resin Bone Model, International Journal of Clinical and Experimental Medical Sciences. Vol. 3, No. 5, 2017, pp. 66-70. doi: 10.11648/j.ijcems.20170305.13
Copyright
Copyright © 2017 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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