Figure 1

Representative cases of medial patellar luxation (MPL) for each Stage: Normal (a), MPL Suspected (b), Stage 1 MPL (c), Stage 2 MPL (d), Stage 3 MPL (e), Stage 4 MPL (f), Unknown (g). In MPL Suspected (B), compared to Normal (A) and Stage 1 MPL (C) Its bounded is unclear (2-Column).