PMC7773449_01
Preoperative radiography. The preoperative radiography was normal. (a) Anteroposterior view; (b) lateral view; (c) skyline view; (d) Rosenberg view.
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Radiographic evaluation was normal, and the MRI did not show any abnormality (Figures 1 and 2).
Preoperative MRI. Preoperative MRI showed no abnormal intensity at the meniscus. (a) T2* sagittal; (b) T2* coronal. MRI: magnetic resonance imaging.
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Radiographic evaluation was normal, and the MRI did not show any abnormality (Figures 1 and 2).
Arthroscopic findings. (a) No cartilage injury at the patellofemoral joint; (b) no meniscus or cartilage injury in the medial compartment; (c) ACL and PCL were intact; (d-f) no posterior lateral meniscus or cartilage injury. Figures 2(d) and 2(e) were viewed from the anterolateral portal.  Figure 2(f) was viewed from the anteromedial portal. MM: medial meniscus; MFC: medial femoral condyle; MTP: medial tibial plateau; ACL: anterior cruciate ligament; PCL: posterior cruciate ligament; LM: lateral meniscus; LFC: lateral femoral condyle; LTP: lateral tibial plateau.
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Arthroscopy showed no abnormal findings in the patellofemoral joint, medial compartment, and intraarticular ligaments (Figures 3(a)-3(c)). The posterior part of the lateral meniscus showed no tear or hypermobility (Figures 3(d)-3(f)).
Arthroscopic stabilization of a hypermobile anterior horn of the lateral meniscus. (a) No tear in the anterior lateral meniscus; (b) Evaluation using the probe showed hypermobility at the anterior horn of the lateral meniscus; (c) Meniscus stabilization was performed by the outside-in technique with two stitches using a strong suture; (d) After stabilization, the hypermobility of the anterior horn of the lateral meniscus was resolved. LM: lateral meniscus; LFC: lateral femoral condyle; LTP: lateral tibial plateau.
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However, the anterior horn of the lateral meniscus was easily translated beyond the lateral condyle by using a probe (Figures 4(a) and 4(b)). Meniscus stabilization was performed by the outside-in technique by taking two stitches using a strong suture (Figure 4(c)). After stabilization, the hypermobility of the anterior horn of the lateral meniscus was resolved (Figure 4(d)).