PMC8687813_01
(a) Magnetic resonance imaging of the left knee. Sagittal plane (left); transverse plane (right), T2-weighted contrast. Presence of an extraarticular infiltrative process with involvement of the subcutaneous tissue and epidermis; inflammatory infiltration of adjacent muscle tissue, without evident collections; small foci of inflammatory edema affecting the subcortical bone marrow; extensive synovitis in the patellar recess and intraarticular involvement. In the transverse plane, there is an increase in the inflammatory process, with volumetric impingement of the popliteus neurovascular bundle. (b) Clinical characteristics of the pyoarthritis. Sequelae with increased left knee volume (left); the inflammatory process in the right ankle caused by trauma from the buckle on footwear (right).
CRII2021-6660937.001.jpg
PMC8687813_01_CRII2021-6660937.001.jpg
fig1
After being discharged from his last hospital stay, the patient presented at the age of 8 with two more subsequently episodes of left knee arthritis triggered by low-impact local trauma and a new episode of arthritis, this one in the right ankle, due to trauma secondary to the use of inadequate footwear (Figure 1(b)).