PMC7476691_01
Plain radiograph of the right knee anteroposterior (a) and lateral (b) showing the loose bodies in the suprapatellar region.
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F1
In addition, radiographic signs of osteoarthritic changes included narrowed medial joint space, mild osteophyte formation, and subchondral sclerosis (Fig.1).
Multiple loose bodies are noted at the enclosed suprapatellar pouch on sagittal views of T1 (a) and T2 (b) magnetic resonance imaging images.
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F2
Pre-operative magnetic resonance imaging (MRI) of the right knee revealed multiple loose bodies within the enclosed suprapatellar pouch with knee joint effusion (Fig. 2).
(a) The blunt puncture made using a trocar in the suprapatellar plica. (b) Enlargement of the blunt incision allowing for the identification of the loose bodies trapped within the suprapatellar pouch. (c) The arthroscopic removal of loose bodies. He was diagnosed as having the complete type of suprapatellar plica.
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F3
On identification, the loose bodies were uneventfully removed (Fig. 3).
Four loose bodies that were removed arthroscopically from the suprapatellar pouch. The diameters of the loose bodies measure from 0.4 cm to 0.8 cm.
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F4
In total, five loose bodies were arthroscopically removed (Fig. 4) and one loose body was sent for histology.
(a) Histology of the loose body at low power showed cellular cartilage with irregular circumferential areas of calcification (x20). (b) At medium power demonstrated areas of fibrocartilage (top) and calcification (bottom) (x100). Feature is suggestive of synovial osteochondromatosis.
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F5
Histology revealed irregular circumferential areas of calcification around the central cartilage, which confirmed the diagnosis of osteochondromatosis (Fig. 5).