Description
Test Criteria
The knee is flexed 20-30° (flexion of the knee tightens the extensor tendons, decreasing the chance of anisotropy occurring in a lax tendon):
- transverse and longitudinal images of the quadriceps tendon from its myotendinous junctions to its attachment on the superior patella (rectus femoris myotendinous junction is more cranial than the vastus junctions)
- evaluate the suprapatellar and parapatellar joint recesses
- suprapatellar fat pad
- prefemoral fat pad
- suprapatellar recess interdigitates between, distension representing likely effusion, most sensitive region
- extent of the medial/lateral suprapatellar recess should also be visualised
