Patellar tendon enthesitis as initial manifestation of ankylosing spondylitis: an atypical presentation.

To cite: Sureka JP, Varghese VD, Kandagaddala M, et al. BMJ Case Rep Published online: [please include Day Month Year] doi:10.1136/bcr-2015213048 DESCRIPTION A 19-year-old man presented to the orthopaedic clinic because of a 3-month history of left anterior knee pain. There was apparently no history of trauma or other comorbidities. He was not involved in athletic activities. On physical examination, there was tenderness at the tibial tubercle. He underwent anteroposterior (AP) and lateral radiographs of the left knee, which showed a focal lucency at the tibial tubercle and soft tissue thickening at the distal patellar tendon (figure 1). He