A patella fracture occurs when there is a break in the patella, better known as the kneecap. The patella is a large, movable bone at the front of the knee.
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Some common causes of this injury include: Sharp blow to the kneeExcessive stress on the knee
Factors that may increase your risk of a patella fracture include: Increased agePostmenopauseDecreased muscle mass
Decreased bone mass—
osteoporosisParticipation in contact sports such as football and soccerObesity
, which places strain on muscles, bones, tendons, and ligaments
Violence, such as car or car-pedestrian accidents
Patella fracture may cause: Sudden, excruciating pain in the kneecapSwelling, bruising, and tendernessInability to extend the kneeDifficulty walking
Your doctor will ask about your symptoms and medical history. A physical exam will be done. The doctor will look closely at the knee to see if there are signs of
. A straight leg test may be done.
Images can evaluate your knee and surrounding structures. These may include: X-rayCT scanMRI scan
Talk with your doctor about the best
for you. Treatment options include the following:
After the tests, your doctor will determine whether you need surgery. If the patella is not badly injured, your doctor will place the knee in a
. This cast may need to be worn for 6 weeks. After that, you will wear a knee brace and do physical therapy. You may need to use a
Your doctor may recommend medication to reduce swelling and pain.
If the patella is in pieces, then you will need surgery. There are two kinds of surgery that are commonly used to treat this injury: Open reduction-internal fixation surgery
—The doctor uses pins and screws to put the broken pieces back together.
Patellectomy—Rarely, the doctor removes part of the kneecap or the entire kneecap.
After surgery, you will need to do physical therapy. This can involve range-of-motion exercises and
. You will slowly build strength in the injured leg. In some cases, another surgery will be
needed to remove the
Depending on the injury, recovery can take weeks to several months.
To help reduce your chance of a patella fracture: Do not put yourself at risk for trauma to the bone.
to build strong bones.
Build strong muscles to support the knee, prevent falls, and to stay active and agile.Wear proper padding and safety equipment when participating in sports or activities.
Henry P, Panwitz B, et al. Rehabilitation of a post-surgical patella fracture.
Patellar (kneecap) fractures. Ortho Info—American Academy of Orthopaedics website. Available at:
http://orthoinfo.aaos.org/topic.cfm?topic=A00523. Updated March 2010. Accessed August 25, 2014.
Stress fractures. The American College of Foot & Ankle Orthopedics & Medicine website. Available at:
http://www.acfaom.org/information-for-patients/common-conditions/stress-fractures. Accessed August 25, 2014.
Tay G, Warrier S, et al. Indirect patella fractures following ACL reconstruction.
Last reviewed September 2016 by Michael Woods, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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