Document Detail


A comparison of radiological and computer navigation measurements of lower limb coronal alignment before and after total knee replacement.
MedLine Citation:
PMID:  22933496     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
We compared lower limb coronal alignment measurements obtained pre- and post-operatively with long-leg radiographs and computer navigation in patients undergoing primary total knee replacement (TKR). A series of 185 patients had their pre- and post-implant 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/m(2) (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.
Authors:
N M J Willcox; J V Clarke; B R K Smith; A H Deakin; K Deep
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of bone and joint surgery. British volume     Volume:  94     ISSN:  0301-620X     ISO Abbreviation:  J Bone Joint Surg Br     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-08-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375355     Medline TA:  J Bone Joint Surg Br     Country:  England    
Other Details:
Languages:  eng     Pagination:  1234-40     Citation Subset:  AIM; IM    
Affiliation:
Clinique la Compassion, 8 Rue de la Charite, 52200 Langres, France.
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