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European Journal of Orthopaedic Surgery & Traumatology

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01-12-2015 | Original Article • HIP - ARTHROPLASTY

Usefullness of three-dimensional templating software to quantify the contact state between implant and femur in total hip arthroplasty

Authors: Daisuke Inoue, Tamon Kabata, Toru Maeda, Yoshitomo Kajino, Kenji Fujita, Kazuhiro Hasegawa, Takashi Yamamoto, Tomoharu Takagi, Takaaki Ohmori, Hiroyuki Tsuchiya

Published in: European Journal of Orthopaedic Surgery & Traumatology | Issue 8/2015

Abstract

Background

It would be ideal if surgeons could precisely confirm whether the planned femoral component achieves the best fit and fill of implant and femur. However, the cortico-cancellous interfaces can be difficult to standardize using plain radiography, and therefore, determining the contact state is a subjective decision by the examiner. Few reports have described the use of CT-based three-dimensional templating software to quantify the contact state of stem and femur in detail. The purpose of this study was to use three-dimensional templating software to quantify the implant–femur contact state and develop a technique to analyze the initial fixation pattern of a cementless femoral stem.

Methods

We conducted a retrospective review of 55 hips in 53 patients using a short proximal fit-and-fill anatomical stem (APS Natural-Hip™ System). All femurs were examined by density mapping which can visualize and digitize the contact state. We evaluated the contact state of implant and femur by using density mapping.

Results

The varus group (cases that had changed varus 2° by 3 months after surgery) consisted of 11 hips. The varus group showed no significant difference with regard to cortical contact in the proximal medial portion (Gruen 7), but the contact area in the distal portion (Gruen 3 and Gruen 5) was significantly lower than that of non-varus group. Density mapping showed that the stem only has to be press-fit to the medial calcar, but also must fill the distal portion of the implant in order to achieve the ideal contact state.

Conclusions

Our results indicated that quantifying the contact state of implant and femur by using density mapping is a useful technique to accurately analyze the fixation pattern of a cementless femoral stem.

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Title: Usefullness of three-dimensional templating software to quantify the contact state between implant and femur in total hip arthroplasty
Authors: Daisuke Inoue
Tamon Kabata
Toru Maeda
Yoshitomo Kajino
Kenji Fujita
Kazuhiro Hasegawa
Takashi Yamamoto
Tomoharu Takagi
Takaaki Ohmori
Hiroyuki Tsuchiya
Publication date: 01-12-2015
Publisher: Springer Paris
Published in: European Journal of Orthopaedic Surgery & Traumatology / Issue 8/2015
Print ISSN: 1633-8065
Electronic ISSN: 1432-1068
DOI: https://doi.org/10.1007/s00590-015-1705-3

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Usefullness of three-dimensional templating software to quantify the contact state between implant and femur in total hip arthroplasty

Abstract

Background

Methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

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