Precise arthroscopic mini-trochleoplasty combined with medial patellofemoral ligament reconstruction yields comparable complications to isolated medial patellofemoral ligament reconstruction

Figure 3 Measurement of patellar instability risk factors, lateral trochlear inclination and lateral patellar tilt. Lateral trochlear inclination was the angle between lateral trochlear facet line (blue line b) and posterior condyles line (green line a). Lateral patellar tilt was the angle between patellar axis line (orange line c) and posterior condyles line (green line a). Green dash line a’ is the parallel line of line a.