PMC5215292_01
Clinical presentation with high-riding patella, anterior tilt of superior part of the patella, and skin dimple inferior to patella.
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fig1
He had persistent anterior knee pain, inability to bend his knee, high-riding patella, anterior tilt of superior part of the patella, and skin dimple inferior to patella (Figure 1).
Pre- and postreduction lateral radiographs show superior dislocation of the patella. (a) showed high-riding patella with inferior patellar osteophyte locked to osteophyte at the superior aspect of femoral condyle. (b) showed normal position of patella.
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fig2
The lateral radiograph of the right knee showed high-riding patella with inferior patellar osteophyte locked to osteophyte at the superior aspect of femoral condyle (Figures 2(a) and 2(b)).
Under high frequency transducer (8 MHz linear transducer), the longitudinal scan showed multiple, parallel echogenic lines of the patellar tendon between the lower pole of the patella and the tibial tuberosity (arrowed). This ultrasound finding confirmed intact patellar tendon.
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fig3
The multiple, parallel echogenic lines of the patellar tendon were demonstrated between the lower pole of the patella and the tibial tuberosity (Figure 3).