A comparison of radiological and computer navigation measurements of lower limb coronal alignment before and after total knee replacement

Willcox, N. M J and Clarke, J. V. and Smith, B. R K and Deakin, A. H. and Deep, K. (2012) A comparison of radiological and computer navigation measurements of lower limb coronal alignment before and after total knee replacement. Journal of Bone and Joint Surgery, British Volume, 94 B (9). pp. 1234-1240. ISSN 0301-620X

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Abstract

We compared lower limb coronal alignment measurements obtained pre- and postoperatively with long-leg radiographs and computer navigation in patients undergoing primary total knee replacement (TKR). A series of 185 patients had their pre- and postimplant radiological and computer-navigation system measurements of coronal alignment compared using the Bland-Altman method. The study included 81 men and 104 women with a mean age of 68.5 years (32 to 87) and a mean body mass index of 31.7 kg/m2 (19 to 49). Pre-implant Bland-Altman limits of agreement were -9.4° to 8.6° with a repeatability coefficient of 9.0°. The Bland-Altman plot showed a tendency for the radiological measurement to indicate a higher level of pre-operative deformity than the corresponding navigation measurement. Post-implant limits of agreement were -5.0° to 5.4° with a repeatability coefficient of 5.2°. The tendency for valgus knees to have greater deformity on the radiograph was still seen, but was weaker for varus knees. The alignment seen or measured intra-operatively during TKR is not necessarily the same as the deformity seen on a standing long-leg radiograph either pre- or post-operatively. Further investigation into the effect of weight-bearing and surgical exposure of the joint on the mechanical femorotibial angle is required to enable the most appropriate intra-operative alignment to be selected.

Creators(s): Willcox, N. M J, Clarke, J. V. ORCID logoORCID: https://orcid.org/0000-0003-4499-7183, Smith, B. R K, Deakin, A. H. and Deep, K.;
Item type:Article
ID code:49322
Keywords:adult, article, body mass, female, human, infant, leg, leg malformation, major clinical study, male, priority journal, total knee replacement, valgus deformity, valgus knee, varus deformity, varus knee, weight bearing, X ray film, Medicine (General), Surgery, Orthopedics and Sports Medicine
Subjects:Medicine > Medicine (General)
Department:Faculty of Engineering > Biomedical Engineering
Depositing user: Pure Administrator
Date deposited:23 Sep 2014 14:49
Last modified:19 May 2020 18:43
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URI:https://strathprints.strath.ac.uk/id/eprint/49322
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