Kim HK, et al. - In patients with patellofemoral instability (PFI), researchers assessed the connection between patellofemoral incongruency and injury mechanism, recurrence, bilaterality, and cartilage damage. For this investigation, they reviewed 94 knee MRI examinations of 84 PFI patients with patella dislocation and medial patellofemoral ligament reconstruction (MPFLR) and 66 examinations of age- and sex-matched control subjects. Based on injury, recurrence, and bilaterality, the PFI group was subclassified. Findings suggested no association of the severity of patellofemoral incongruence with injury mechanism or cartilage damage in patients with PFI. Increased patellar tendon lateralization (TT-TG distance) and patella alta (patellar tendon ratio), however, associated with injury to the contralateral knee requiring bilateral MPFLR.