Fig. 1From: Clinical outcomes and predictive factors for failure with MPFL reconstruction combined with tibial tubercle osteotomy and lateral retinacular release for recurrent patellar instabilityLine A (yellow line): the distance from the lowest point of patellar-articular surface to the anterior edge of tibial plateau; Line B (red line): the length of patellar articular surface. CDI = A/B; CDInormal = 1; Anormal = B; Aactual = CDIactual × B; The amount of distalization = Anormal-AactualBack to article page