red (superior patella)-quadriceps tendon

blue-femoral condyle (articular surface of distal femur)

green-tibial tuberosity

red (tibial tuberosity)-
patellar tendon, continuation of quadriceps past patella, sesamoid bone

blue-tibial plateau (articular surface of proximal tibia)

green-fibular head

red (anterior margin of tibia and posterior margin of femoral condyle)-anterior cruciate ligament

blue-patellar facet of femur (articular surface of patellofemoral joint)

green-interosseous ligament (attachment point for many leg muscles)

Which of these patients needs more imaging? What type of imaging? (click the dark blue button to consult the ACR Appropriateness Criteria)

acute knee trauma

knee pain