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International Orthopaedics

Published in:

01-09-2018 | Original Paper

Soft tissue tension is four times lower in the unstable primary total hip arthroplasty

Authors: Takeshi Ogawa, Masaki Takao, Hidetoshi Hamada, Takashi Sakai, Nobuhiko Sugano

Published in: International Orthopaedics | Issue 9/2018

Abstract

Purpose

The aim was to compare patients who suffered recurrent dislocation following total hip arthroplasty (THA) with those who did not to clarify the degree of soft tissue tension in dislocation patients.

Methods

The subjects were 18 hips with recurrent dislocation (unstable THA group) and 37 hips without dislocation (stable THA group). To evaluate soft tissue tension, radiographs were taken while applying distal traction at traction forces of 40, 30, and 20% of the body weight (BW) and femoral head displacement was measured. Acetabular offset, femoral offset, limb offset, and leg length discrepancy were measured in patients with a normal contralateral hip joint.

Results

The mean femoral head displacement in the unstable THA group was 5.6 mm at 40% of the BW, 4.6 mm at 30% of the BW, and 3.5 mm at 20% of the BW. In the stable THA group, the mean femoral head displacement was 1.4 mm at 40% of the BW, 1.1 mm at 30% of the BW, and 0.9 mm at 20% of the BW. Significant differences were seen between the groups at all traction forces. Furthermore, on comparing the unstable and stable THA groups, femoral offset was found to significantly be smaller in the affected side than in the healthy side in the unstable THA group.

Conclusions

We found that soft tissue tension is approximately fourfold lower in patients exhibiting recurrent dislocations following THA than in patients exhibiting no dislocations and that femoral offset was related to decreased soft tissue tension.

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Title: Soft tissue tension is four times lower in the unstable primary total hip arthroplasty
Authors: Takeshi Ogawa
Masaki Takao
Hidetoshi Hamada
Takashi Sakai
Nobuhiko Sugano
Publication date: 01-09-2018
Publisher: Springer Berlin Heidelberg
Published in: International Orthopaedics / Issue 9/2018
Print ISSN: 0341-2695
Electronic ISSN: 1432-5195
DOI: https://doi.org/10.1007/s00264-018-3908-9

At a glance: The STEP trials

Springer Medicine

Soft tissue tension is four times lower in the unstable primary total hip arthroplasty

Abstract

Purpose

Methods

Results

Conclusions

At a glance: The STEP trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

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