PMC3801231_01
Anteroposterior and lateral radiographs showed a slight degenerative change in the medial side of the knee
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F0001
A plain X-ray showed a slight degenerative change in the medial side of the knee (Figure 1).
Sagittal T1-weighted image showing inhomogenous high signal intensity of the intact ACL.
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F0002
MRI of the right knee showed an increased intraligamentous signal for the ACL with high inhomogeneous intensity and cracking of the external meniscus undisplaced (Figure 2, Figure 3).
Sagittal T2-weighted image showing increased intraligamentous signal intensity of the ACL.
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F0003
MRI of the right knee showed an increased intraligamentous signal for the ACL with high inhomogeneous intensity and cracking of the external meniscus undisplaced (Figure 2, Figure 3).
Arthroscopic view of the anterior cruciate ligament (ACL) over the right knee. (A and B) Yellowish discoloration and sclerotic lesions on the lateral portion of the ligament; (C) ACL after debridement
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We found some yellow and sclerotic lesions on the lateral portion of the ligament and excised these lesions as precisely as possible (Figure 4).
(Histological biopsy specimen from the ACL showing mucoid degenerative tissue (big arrow) and normal ligamentous collagen tissue (small arrow) (H&E, original magnification x40)
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Histological examination revealed fragments of mucoid degeneration of the ligament (Figure 5).