Patella baja may also be seen in association with neuromuscular diseases. Fromtal (c) and lateral (d) radiographs in this patient with a history of polio show marked patella baja. Also nite that the bine are osteopenic and gracile and that there is a paucity of soft tissues, in keeping with the patient`s history of polio.
Fig. 5: Bipartite patella 图5:二分髌骨
Anteroposterior, lateral, and axial radiographs (s) show a lucent, round lesion with well-defined margins at the superolateral aspect of the patella (arrows). Sagittal proton density and axial T2-weighted fat-suppressed MR images (b) show a focal subchondral osseous defect with intact-appearing overlying cartilage; the cartilage is thickened, and fills the defect. There is normal bone marrow signal and smooth, homogeneous signal of the articular cartilage.