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.
Original language | English |
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Pages (from-to) | 1234-1240 |
Number of pages | 7 |
Journal | Journal of Bone and Joint Surgery, British Volume |
Volume | 94 B |
Issue number | 9 |
DOIs | |
Publication status | Published - 1 Sept 2012 |
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