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Archives of Orthopaedic and Trauma Surgery

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01-03-2017 | Knee Arthroplasty

Minimal effect of patella eversion on ligament balancing in cruciate-retaining total knee arthroplasty

Authors: Eirik Aunan, Thomas Kibsgård, Stephan M. Röhrl

Published in: Archives of Orthopaedic and Trauma Surgery | Issue 3/2017

Abstract

Purpose

The effect of patellar eversion on ligament laxity measurements is still unclear. The purpose of this study was to investigate the influence of patellar eversion on medial and lateral ligament laxity measurements performed intra-operatively in total knee arthroplasty (TKA).

Methods

A total of 49 knees (27 female) with mean age 70 years (42–83) and mean body mass index of 28.5 were operated consecutively with a cruciate-retaining prosthesis. Medial and lateral ligament laxity in extension and in 90° of flexion was measured with the spatula-method intra-operatively after implantation of the prosthetic components with the patella everted and thereafter with the patella repositioned. The corresponding changes in gap height and inclination were calculated.

Results

A statistically significant increase of 0.6 mm (p < 0.001) in ligament laxity (condylar lift-off) laterally in flexion was found with the patella repositioned compared to everted. No differences were found in extension or medially in flexion. Correspondingly, the flexion gap increased by 0.4 mm (p < 0.001) and the flexion gap inclination increased by 0.6° (p = 0.002) when the patella was repositioned.

Conclusions

Earlier research has shown that ligament laxity must be at least 1–2 mm to cause inferior function after TKA. In the current study, we found that the effect of patellar eversion on ligament laxity measurements is too small to be considered clinically relevant.

Prospective study evaluating the effect of patient characteristics

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Title: Minimal effect of patella eversion on ligament balancing in cruciate-retaining total knee arthroplasty
Authors: Eirik Aunan
Thomas Kibsgård
Stephan M. Röhrl
Publication date: 01-03-2017
Publisher: Springer Berlin Heidelberg
Published in: Archives of Orthopaedic and Trauma Surgery / Issue 3/2017
Print ISSN: 0936-8051
Electronic ISSN: 1434-3916
DOI: https://doi.org/10.1007/s00402-017-2625-y

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Minimal effect of patella eversion on ligament balancing in cruciate-retaining total knee arthroplasty

Abstract

Purpose

Methods

Results

Conclusions

Prospective study evaluating the effect of patient characteristics

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

Prospective study evaluating the effect of patient characteristics

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