Mylène Jansen

382 Chapter 18 Results Patients Three patients did not have appropriate CT imaging at baseline and at least 1 follow-up time point, 1 patient could not be analyzed because of metal artifact around the joint space area at baseline, and in 1 patient the imaged femur shaft at baseline was too short for final analysis. This left 16 patients for tibial analyses and 15 patients for femoral analyses at baseline. These patients were all available at 1-year follow-up as well, while 1 patient was lost to follow-up between 1 and 2 years because of additional surgery. Baseline characteristics for the 16 included patients are shown in Table 1. The MAC was predominantly the medial knee compartment (medial MAC n=14; lateral MAC n=2). Table 1 : Baseline parameters of included patients KJD patients (n=16) Age (years) 53.8 (6.8) BMI (kg/m 2 ) 26.7 (3.4) Male sex, n (%) 11 (69) Medial MAC, n (%) 14 (88) Kellgren-Lawrence grade, n (%) - Grade 0 - Grade 1 - Grade 2 - Grade 3 - Grade 4 0 (0) 2 (13) 1 (6) 9 (56) 4 (25) Mean and standard deviation or n (%) are given. BMI: body mass index; KJD: knee joint distraction; MAC: most affected compartment. Cortical bone thickness Cortical bone thickness results for patients with a predominantly medial compartmental knee OA are shown in Figure 2. On average a higher thickness was seen on the medial femur and tibia compared to the lateral side for these patients, as indicated by the green-blue color on the medial side as compared to the yellow-orange elsewhere. Similarly, the average of the 2 patients with predominantly lateral compartmental OA showed a higher subchondral cortical bone thickness at the lateral site as compared to the medial side (Supplementary Figure S1).