Fig. 3
From: The SP-ET index is a new index for assessing the vertical position of patella
Illustration of the entrance plane of femoral trochlea, proximal slice and distal slice. a The proximal slice of the entrance plane of femoral trochlea, lateral articular surface showed the presence of cartilage, but the boundary was blurred, and medial articular surface was without cartilage covering. b The entrance plane of femoral trochlea, and it was the first craniocaudal plane where the complete cartilaginous trochlea can be seen. c The distal slice of the entrance plane of femoral trochlea, and the trochlea groove can be seen deepening