Shape Analysis of the Patellar Bone Surface and Cutting Plane for Knee Replacement Surgery

Figure 5

Angle of drawn lines on axial projections: (a) axial resection (AR) lines and (b) axial anterior surface (AS) lines. Positive angles mean the patella is thicker medially. Results are centred around zero for each patella. SCP = symmetric contact points, i.e., the calculated plane based on the final selected configuration (Section 3.2), which is symmetric about the patellar centre. While the SCP planes did not always match the anterior surfaces drawn (b), they were within a few degrees of the desired resection plane (a), which is the primary clinical goal. S1–S4 = surgeons 1–4.

(a)

(b)