PMC10097990_01
Preoperative X-ray and MRI. (A) The left Weight-Bearing line (red) was 35 mm more varus than the contralateral side (blue). (B) Narrowing of the medial compartment of the left knee. (C,D) The short white arrow showed subluxation of the medial meniscus. The short red arrows showed the cartilage wearing on both sides of the medial femur and tibia. The long red arrows showed the normal cartilage on the lateral side of the knee. The long white arrows showed the lateral meniscus was intact. (E) The short white arrow showed subluxation of the medial meniscus. The short red arrows showed the cartilage wearing. The long red arrow indicated the popliteal cyst.
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F1
Kellgren-Lawrence (K/L) medial compartment grade IV and lateral compartment K/L grade II were based on radiographs of the left knee (Figures 1A,B). There was a high-signal-intensity cyst (Length: 5.27 cm, depth: 1.79 cm, width: 3.10 cm) between the semimembranosus and the medial head of the gastrocnemius tendons (Figures 1C-E).
Arthroscopic surgery view (A-D) and immediate postoperative X-ray (E-G) evaluation after the surgery. (A) Severe cartilage wearing of the medial femoral and tibial condyles. (B) Normal lateral meniscus and cartilage of the femoral and tibial condyles. (C) The wall of the popliteal cyst is filled with orange juice-like fluid. (D) Resection of the cyst wall. (E) The Weight-Bearing line (red) of the left lower extremity returned to a normal position similar to the contralateral side (blue). (F,G) Long red arrows indicated the drainage tube.
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F2
Obvious synovial hyperplasia was visualized under arthroscopy and numerous osteochondral defects were found both in the medial femoral and tibial condyles, with server medial meniscal damage (Figure 2A). However, the cartilage on the lateral femoral and tibial condyle and the lateral meniscus remained intact (Figure 2B). The intact cyst wall was visualized by switching the arthroscope to the posteromedial portal and filled with orange juice-like fluid (Figure 2C). The following completely dissected cyst wall was performed via an additional portal inferior and posterior to the posteromedial portal, and a drainage tube was used (Figures 2D-G). The X-ray showed the prosthesis's appropriate position and optimal size (Figures 2E-G).