case_images: PMC10868182_01
case_images: Cystic lesion observed during the patient's arthroscopic debridement procedure.
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case_images: The review of the patient's medical records showed that he underwent arthroscopic debridement and percutaneous fixation (Acutrak headless compression screw) (Figure 1). First, arthroscopic intervention was performed on the knee joint, during which it was observed that the screws placed in the patient's knee three years before were not infected and the osteochondral fragment had healed stably (Figure 1).
case_images: Pinning procedure seen on the X-ray imaging of the patient.
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case_images: Imaging tests also showed the fixation procedure performed on the patient (Figure 2).
case_images: Penumbra sign in the MRI imaging of the patient.
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case_images: Low-density fluid and an oval lesion of approximately 2 cm surrounded by hyperintense granulation tissue in the distal femur metaphysis were observed in the MRI (Figure 3). The penumbra sign, which weakly signals hyperintense content with a characteristic border of granulation tissue, as seen in the main abscess content in the MRI imaging (Figure 3), is an early sign of osteomyelitis.
case_images: Appearance of the lesion during the surgery.
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