A member asked:

Swelling knee water bursa sac. what are causes?

A doctor has provided 1 answer
Dr. John Michalski answered

Specializes in Orthopedic Surgery

Bursa: Usually prepatellar bursitis is caused by direct or shear-type injury to area in front of kneecap. A pes anserine bursitis is ususally caused by activity with tight hamstrings that pull on this insertion site.

Answered 1/3/2018

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