Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier
WebMD

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started
My Medicine
WebMD

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion
    WebMD

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community
    WebMD

    Community

    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Knee Pain Health Center

Font Size
A
A
A

Patellar Dislocation - Topic Overview

The kneecap (patella) is normally positioned over the front of the knee joint at the base of the thighbone (femur). A kneecap can be dislocated, or moved out of its normal position, when:

  • The inner edge of the kneecap is hit, pushing it toward the outer side of the leg. This can happen more easily if there is patellar tracking disorder (the kneecap is already slightly out of place).
  • The foot is firmly planted pointing outward, and the knee is bent with the thigh turned inward. This kind of injury is common during many sports activities.

Symptoms of a dislocated kneecap may include:

Recommended Related to Knee Pain

Why You Must Protect Your Knees

By Jeannette Moninger Women are the weaker-kneed sex - really! Ease the pain with these tips. Years of stooping, kneeling, and running around really takes a toll on your knees, and women have it especially bad: Studies show we're up to six times more likely than men to suffer from knee injuries like ACL tears. Got an achy, creaky, or weak knee? We'll help you find the cause — plus, we've got ways to fix your bad knees for good.

Read the Why You Must Protect Your Knees article > >

  • Severe pain.
  • A misshapen knee that looks like a bone is out of position.
  • A popping sensation, followed by a feeling that something is out of place.
  • Inability to bend or straighten the knee.
  • Knee swelling.
  • Cool, pale skin or numbness and tingling in or below the affected knee.

A dislocation can cause other problems even if the bone pops back into place.

  • If the dislocation was due to weak thigh muscles or a problem with the alignment or structure of the knee bones, the knee may dislocate again.
  • Ligaments, tendons, muscles, and cartilage in or around the joint may stretch or tear.
  • A piece of bone may break off somewhere in the knee joint.

WebMD Medical Reference from Healthwise

Last Updated: June 04, 2014
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
1
Next Article:

Today on WebMD

knee exercise
If you're living with knee pain, try these.
knee in brace
Everything you wanted to know about it.
 
nurse helping woman on crutches
When it comes to knee pain.
man with knee pain
Read this first.
 
man biting a bullet
Article
6 Ways To Ruin Your Knees
Article
 
Keep Joints Healthy
SLIDESHOW
Knee exercises
SLIDESHOW