Why is My Knee Swollen ?

Steve Mora MD

Orange County Knee Specialist

KNEE SWELLING 101: How to tell apart a KNEE EFFUSION from swelling associated with a Prepatella BURSITIS. This is important to know because the approach for removing the fluid is different and one type of swelling is more serious than the other.

A EFFUSION is caused by pathology deep within the joint. For example, acute trauma such as an ACL tear or a fracture will lead to a effusion called a hemarthrosis. If the deep pathology is due to arthritis or a meniscus tear the effusion is made up of excessive synovial fluid build up. Regardless the fluid is located deep in the joint.

PREPATELLA BURSITIS presents a little differently. It’s usually due to direct impact or continuous pressure to the front of the knee. I see this in Jiu Jitsu fighters who make hard contact onto the mat with the front of their knee. I also see it in people who accidentally kneel down onto a small pebble or bump the knee on the edge of their desk. Bursitis is often confused with a knee effusion.

Patients with bursitis simply need to have the fluid removed and the problem will be solved. Sometimes you need to do this a couple of times.

Patients with a effusion need the fluid removed AND a MRI to determine the underline injury deep in the joint. I hope you enjoy the videos below.

About Dr Mora:

About Steve A. Mora MD:

Dr. Mora is a board-certified orthopedic surgeon at Restore Orthopedics and Spine Center in Orange County.
He specializes in:

-Sports Trauma -Arthroscopy of the knee, shoulder, hip and elbow.
-Arthritis of the Knee

-Mixed Martial Arts Injuries

-First Responder Injuries

-Regenerative Medicine:Lipogems, Bone Marrow Stem Cells, Plasma therapy.

For a consultation please call Restore Orthopedics and Spine Center in the City of Orange 714-598-1745

Dr. Mora’s family heritage is Peruvian. He speaks fluent Spanish.


Restore Orthopedics and Spine Center

112o W. La Veta Ave, Third Floor

Orange, CA 92868

Office: (714) 598-1745

Fax: (714) 941-9539

Please note that our Restore Orthopedic Urgent Care is open M-F 9-5:30 pm. If you have an acute injury you do not need an appointment. Walk-ins are welcome. Please come in today. For appointments with Dr. Mora please call 714.598.1745 or fill out the form below. Thank you.

Para consultas con Dr. Mora por favor de llamar a 714.598.1745 o llene la siguiente forma.

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