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MR images before ACL reconstruction surgery.. (A) Sagittal T1-weighted image shows a ruptured ACL (arrows).. (B) Coronal T2-weighted image demonstrates normal and nondisplaced meniscus (arrow).
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Magnetic resonance imaging (MRI) demonstrated a complete tear of the ACL without meniscal tear (Fig. 1A, B).
Arthroscopic findings at the time of ACL reconstruction.. (A) There was no meniscal tissue that connected between the anterior and posterior meniscal roots (arrows).. (B) The lateral portion of the ACL tibial footprint was preserved during tibial tunnel creation.. LMAR: lateral meniscus anterior root, LMPR: lateral meniscus posterior root.
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There were no meniscal anomalies such as discoid meniscus and ring-shaped meniscus (Fig. 2A). To prevent the damage to the anterior insertion of the lateral meniscus, the lateral portion of the ACL tibial footprint was preserved during tibial tunnel creation (Fig. 2B).
MR images before second-look arthroscopy.. (A) A newly-developed bridging tissue (arrow).. (B) The bridging fiber formed a ring-shaped lateral meniscus (arrow).
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A coronal plane of MR images showed a small triangular fragment located at the medial border of the lateral tibial plateau (Fig. 3A). An axial plane demonstrated a ring-shaped lateral meniscus (Fig. 3B).
Arthroscopic findings at the time of second-look arthroscopy.. (A) A meniscus-like tissue connected the anterior horn to the posterior horn of the lateral meniscus (arrows).. (B) The bridging tissue of the ring-shaped lateral meniscus (arrows).
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There was a meniscus-like tissue formation that connected the anterior horn to the posterior horn of the lateral meniscus at the lateral intercondylar tubercle (Fig. 4A, B).