Do You Have An Unstable Kneecap?
We depend on our knees to move easily. An unstable kneecap inhibits smooth movement and can lead to chronic problems. We explain the symptoms that signal this injury.
What is an unstable kneecap?
Every time we rise from a seated position, take a stroll, or kneel to tend a garden, we are relying on the stability of our knees. The kneecap, or patella, is critical to stability in the knee joint. The kneecap is a small bone located in the front of the knee joint where the thighbone and shinbone meet. It acts as a shield for the joint, and connects the muscles in the front of your upper leg to your shinbone. The underside of the kneecap is covered with slippery hyaline cartilage that allows the bones in the joint to glide smoothly as your leg moves.
Because the kneecap connects thigh muscles to the bone in your lower leg, bending and straightening your leg causes the kneecap to be pulled up or down—but it is held in place by a groove in the thighbone. However, if the groove is uneven or too shallow, the kneecap may slide out of place causing partial or complete dislocation. A blow to the kneecap could also pop it out of position in the joint.
Symptoms of an unstable kneecap
The symptoms that signal a partial or complete kneecap dislocation include the following:
- A sense that the knee is buckling and can no longer support your weight.
- The kneecap slips off to the side of the joint and no longer feels as though it is in the proper position.
- When you bend or straighten your leg, there’s a catching sensation in the knee joint.
- Pain in the front of your knee that increases with activity.
- You feel knee pain while sitting.
- Experiencing stiffness or swelling in the knee.
- When you move your knee, it makes creaking or cracking sounds.
How to treat an unstable kneecap?
If you experience these symptoms, consult your orthopedic doctor for an examination and diagnosis. Dislocation can damage the underside of the kneecap and the bones in the joint; in addition to being painful, this injury can lead to arthritis.
The first step in treating a dislocated kneecap is to return it to its proper position. This is done through a process called reduction. Sometimes, reduction happens spontaneously. Other times, your physician may need to gently push the kneecap back into alignment. Exercises and bracing can strengthen the muscles that hold the kneecap in place. If the instability becomes chronic, you and your doctor may consider surgery to correct the problem. With prompt treatment, you should be able to return to your regular activities within one to three months of diagnosis and treatment.
Summit Orthopedics offers comprehensive sports medicine expertise
From Olympians to pro athletes to kids in youth sports and those that just want to be more active—Summit Orthopedics delivers expert care by fellowship-trained sports medicine physicians. If you are recently injured or concerned about ongoing pain, Summit Orthopedics sports medicine specialists have the expertise to evaluate your discomfort and develop a plan to quickly and safely help you get back to being active.
Summit has convenient locations across the Minneapolis-St. Paul metro area, serving Minnesota and western Wisconsin. We have state-of-the-art centers for comprehensive orthopedic care in Eagan, MN, Vadnais Heights, MN, Plymouth, MN, and Woodbury, MN, as well as several additional community clinics.
More resources for you
- What is Jumper’s Knee?
- Watch the video: Common Knee Injuries for Runners
- Ask Dr. Breien: Is A Partial Knee Replacement A Good Option For Me?
- Check out the article: What Are The Risks Of An Unstable Kneecap?
- More from Dr. Skendzel on unstable kneecaps: Surgical Options For Unstable Kneecaps
Once a kneecap has dislocated, the risk of subsequent dislocations, permanent cartilage damage, and osteoarthritis increases substantially. Dr. Skendzel discusses the surgeries he uses to reduce this escalating injury risk and protect knee function.
Once you’ve dislocated a kneecap, you are at increased risk for subsequent dislocations that can cause significant knee damage over time. Dr. Skendzel explains why medical treatment is so important for the first dislocation, and discusses the injury risks.
Sports-related kneecap injuries are common among young athletes. Dr. Skendzel explains when these injuries should be medically evaluated.