We have investigated the benefits of patient
specific instrument guides, applied to osteotomies around the knee. Single,
dual and triple planar osteotomies were performed on tibias or femurs
in 14 subjects. In all patients, a detailed pre-operative plan was
prepared based upon full leg standing radiographic and CT scan information.
The planned level of the osteotomy and open wedge resection was
relayed to the surgery by virtue of a patient specific guide developed
from the images. The mean deviation between the planned wedge angle
and the executed wedge angle was 0° (-1 to 1, . sd. 0.71)
in the coronal plane and 0.3°
(-0.9 to 3, . sd. 1.14) in the sagittal plane. The mean deviation
between the planned hip, knee, ankle angle (HKA) on full leg standing
radiograph and the post-operative HKA was 0.3° (-1 to 2, . sd. 0.75).
It is concluded that this is a feasible and valuable concept from
the standpoint of pre-operative software based planning, surgical
application and geometrical accuracy of outcome. . Cite this article: Bone Joint J 2013;95-B, Supple
A:153–8