PMC8633896_01
The patient's physical examination was performed.
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F1
On April 24, 2019, a Physical and Rehabilitation Medicine (PRM) physician performed physical examinations (Figure 1), and a PRM physician experienced in musculoskeletal ultrasound diagnostic used Samsung HM70A model 5 18 Hz frequency probe to examine the patient's painful knee joint.
The patient's deep subpatella sac effusion.
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F2
An echoless area (about 0.57*0.35) was visible on the deep surface of the patellar tendon (Figure 2).