Fig. 4

Lateral minJSW in AP and PA-flexed view for different severities of valgus deformity (< 5.0 deg., 5.0–9.9 deg., 10.0–14.9 deg., ≥15.0 deg.). The grey field mark the section where minJSW is more than 2 mm less in PA-flexed view compared to the AP view. The numbers in the upper-left display the percentages of knees in this grey field. Especially in knees with zero to ten degrees of valgus there is a substantial number of knees (37.8% or 26.0%) that had more than 2 mm minJSW in AP view but showed “bone on bone” arthritis on the PA-flexed view (red circle)