Synovial chondromatosis of the hip joint in childhood
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The present case has been reported in the journal Medicine.

The patient was a 7-year-old boy who was admitted due to pain in the right hip joint and limping for more than 1 month. He did not have a history of obvious trauma before the onset of the disease.

The physical examination revealed a limp in the right lower limb; swelling in the right hip joint; groin folds asymmetry; moderate skin temperature; local tenderness; limited intorsion, extorsion, and flexion in the right hip joint; and Allis sign (+), Thomas sign (+), and Patrick sign (+) on the right side. B-ultrasound revealed effusion in the right hip joint, x-ray film revealed the widening of the right hip-joint spacing, computed tomography (CT) showed the destruction of the right acetabulum inner wall, and MRI revealed a large amount of effusion in the right hip joint with abnormal signals.

For the surgery, the patient was placed in a supine position; a Bikini incision was made on the right side; and the rectus femoris was separated, cut, and flipped down to expose the articular capsule, which was then cut open to reveal the overflow of a number of white semitranslucent circular loose bodies. Also, the articular cavity was filled with loose bodies. A bone defect of about 2 × 2 cm2 was detected in the inner acetabular wall, the lower part of the articular capsule was ruptured, and the synovial tissue was hyperplastic.

The loose bodies were of different sizes, white or milky white, smooth and semitranslucent, tough, cartilage-like, and elastic, a few of which were pedicled and connected with the synovium. A translucent and clear fluid was visible after the loose bodies were cut open. Postoperative pathology confirmed SC and the patient was finally diagnosed as primary SC. At the 6-month follow-up, pain and limping disappeared, and the range of activity of the hip joint was restored to a normal level.

Key takeaways:-
- Synovial chondromatosis is an uncommon disease which can cause pain of hip joint in children.

- When the pediatric orthopedic surgeon treats the children suffered with hip pain the surgeon should be aware of this rare disease.

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