How is synovial hernia caused?

Patient's question:

Previously fell off a 2-meter ladder, left hip hitting the ground.

Doctor's answer:

Hello! Based on your examination, if there is a small amount of fluid accumulation in the bursae, it does not necessarily indicate a bursitis. This condition is rare and is usually caused by severe local trauma leading to a rupture of the synovial membrane, resulting in fat tissue entering the synovial cavity. However, this condition does not typically cause symptoms in the lower limbs.
Recommendation: Given your situation, I suggest you undergo a CT scan (or MRI, which is relatively more expensive) of the lumbar disc to confirm the diagnosis. Your symptoms are mostly likely caused by compression of the sciatic nerve, which generally manifests as a heavy sensation or a feeling of tightness in the lower limbs, accompanied by lower limb pain or numbness. This is due to sciatic nerve compression, with the most common cause being a herniated or bulging lumbar disc compressing the sciatic nerve. In a few cases, it may be caused by piriformis syndrome (which is rare).
Based on my personal experience, your condition is more likely caused by a herniated or bulging lumbar disc compressing the sciatic nerve. It is recommended to visit a hospital's orthopedics department for examination. The doctor can make a preliminary judgment about whether the sciatic nerve is compressed through manual tests (such as the straight leg raise test and the test). If necessary, a lumbar disc CT scan can then be performed.
The above analysis and recommendations are for your reference. I hope they can help you resolve the issue.

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