PMC5794358_01
Preoperative MR T2 image.
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F1
Degenerative change (Kellgren and Lawrence:KL grade 2) of the left knee was observed, along with cartilage delamination corresponding to International Cartilage Repair Society (ICRS) grade 4 in the patellofemoral joint (Fig. 1).
Preoperative knee lateral X-ray.
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F2
Additional conservative treatment was performed, and a metal plate was surgically removed approximately 9 months after the operation, while another metal plate was removed after 1 year (Fig. 2).
Preoperative ultrasonography.
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F3
Ultrasonography confirmed that the fabella was located at the tender point (Fig. 3).
A direct approach to the posterolateral aspect of the right knee and resected tissue findings.
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F4
The fabella in the lateral gastrocnemius was excised through a direct approach to the posterolateral aspect of the right knee while the patient was in the prone position (Fig. 4).
Intraoperative clinical photo after resection.
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F5
After resection, the cartilage on the posterior side of femoral lateral condyle was examined, and superficial scratches or cartilage fissures were observed on the surface (Fig. 5).
Preoperative and postoperative X-ray.
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F6
There was no evidence of recurrence during 5 months of postoperative follow-up (Fig. 6).