Fig. 2-A Photograph showing a sensor-based device that is used to measure the load within the medial and lateral compartments of the knee. Fig. 2-B Computer feedback demonstrating an imbalance between compartments. Fig. 2-C Computer feedback obtained after surgical correction, showing that the measured loads in the medial and lateral compartments are equal.
Fig. 4-A Preoperative T1-weighted MRI scan used for surgical planning. Fig. 4-B Three-dimensional computer reconstruction of osseous anatomy based on the MRI scan shown in Figure 4-A. Fig. 4-C Three-dimensional computer reconstruction demonstrating virtual component implantation with the use of computer software. Fig. 4-D Computer graphic rendering of the design of patient-specific instrumentation to achieve desired component position and alignment. Fig. 4-E Postoperative radiograph. (Images reprinted with permission from Smith & Nephew.)