Fig. 2

Description of the main components of knee morphology used in the present study. The trochlear groove was located laterally relative to the mechanical axis, and consisted of the laterally oriented proximal part and the medially oriented distal part. Based on the location of the turning points in different cross sections, the trochlear groove morphology was classified into four types (45°, 60°, 75°, and 90°). Adapted from ‘Morphological classification of the femoral trochlear groove based on a quantitative measurement of computed tomographic models’, Knee Surg Sports Traumatol Arthrosc, DOI: 10.1007/s00167-016-4236-5