Figure 4.

Patellar maltracking. A 33-year-old female with bilateral knee pain. (A) Two-phase bone scintigraphy shows non-specific focal increased osteoblastic activity in both patellae arrows). (B) SPECT/CT shows lateral deviation of both patellae and shallow trochlear grooves with increased osteoblastic activity at the lateral patellofemoral articulations (arrows). [Reproduced with kind permission from Lu SJ et al, Value of SPECT/CT in the evaluation of knee pain. Clin Nucl Med 2013; 38(6): e258–60.³⁵]