PMC6854964_01
Plain radiograph obtained preoperatively showing no abnormalities.
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No abnormality was found on plain radiography (Figure 1); however, magnetic resonance imaging (MRI) revealed thinning of the ACL and a cystic lesion (phi23 x 12 mm) within the ACL that was hypointense on T1-weighted imaging and hyperintense on T2-weighted imaging (Figure 2).
Magnetic resonance images obtained preoperatively. MRI revealed thinning of the ACL and a cystic lesion (phi23 x 12 mm) in the intercondylar fossa that was hypointense on T1-weighted imaging and hyperintense on T2-weighted imaging. (a) Sagittal T1-weighted scan. (b) Sagittal T2-weighted scan. (c) Coronal T1-weighted scan. (d) Coronal T2-weighted scan. (e) Axial T2-weighted scan.
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No abnormality was found on plain radiography (Figure 1); however, magnetic resonance imaging (MRI) revealed thinning of the ACL and a cystic lesion (phi23 x 12 mm) within the ACL that was hypointense on T1-weighted imaging and hyperintense on T2-weighted imaging (Figure 2).
Findings on arthroscopy. (a) The anterior cruciate ligament (ACL) is slightly swollen but intact. (b) There is no cystic lesion around the ACL. (c) Longitudinal incision made on the anterior aspect of the ACL. (d) Discharge from an intraligamentous hematoma.
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There were no abnormal arthroscopic findings in the articular cartilage or meniscus (Figure 3).
Sagittal (a) T1-weighted and (b) T2-weighted magnetic resonance images acquired one year after surgery confirm complete resolution of the intraligamentous hematoma and an intact anterior cruciate ligament.
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Follow-up MRI performed one month postoperatively confirmed no recurrence of the hematoma (Figure 4).