PMC7132354_01
Swelling and cyst formation at the lateral aspect of the knee ten years after a noncomplicated ACL reconstruction. The cyst is underneath the skin incision that was made for the introduction of the crosspin device for femoral graft fixation.
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fig1
Physical exploration showed swelling at the lateral aspect of the lateral femoral condyle (Figure 1).
Magnetic resonance image (MRI) showing the fistula, marked with a red circle, that connects the ACL graft femoral tunnel to the cortical bone. The tunnel is filled with synovial fluid which comes from inside the joint. This image also shows the soft tissue disruption in the lateral aspect of the femoral condyle.
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fig2
Intraoperative picture showing the cortical bone defect that originates the cyst at the lateral aspect of the lateral femoral condyle.
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fig3
ACL graft fixation, persisted (Figure 3) with rounded soft tissue burn. At the lateral aspect of the femoral condyle, a cyst-like cavity was found.