Patellar Dislocation

The kneecap (patella) normally rests in a small groove at the end of the thighbone (femur). As the knee bends and straightens, the patella glides smoothly within this groove. A patellar dislocation occurs when the kneecap slips partially or completely out of this track.

This may happen due to a fall, a direct blow, or underlying structural issues in the knee. Even if the kneecap shifts back into place on its own, a medical evaluation is important to assess pain, swelling, or potential damage to surrounding structures.

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What Causes Patellar Dislocation?

Patellar dislocations can result from a combination of structural, biomechanical, and traumatic factors, including:

• A shallow or uneven trochlear groove in the femur
• Loose or flexible ligaments that allow excessive joint movement
• Muscle imbalance or weakness around the knee
• Direct blows or falls, especially during sports or high-impact activities
• Twisting movements, such as planting the foot and pivoting

Even individuals with normal knee anatomy can experience a dislocation during sudden directional changes or awkward landings.

What are Symptoms of Patellar Dislocation?

A patellar dislocation may cause:

• Pain around the kneecap
• Swelling in the knee
• A sensation that the kneecap is shifting or sliding out of place
• Knee buckling or giving way
• A popping sound at the moment of dislocation
• Visible deformity or change in knee appearance
• Apprehension or fear when bending, running, or changing direction

How is Patellar Dislocation or Knee Instability Diagnosed?

A specialist will review how the injury occurred and evaluate symptoms and follow up questions. The knee will be examined for swelling, tenderness, range of motion, and alignment. Imaging such as X‑rays or MRI scans may be used to assess bone structure, cartilage, and ligament integrity.

How is Dislocation of the Kneecap Treated?

Treatment depends on whether the kneecap has returned to place, the extent of soft tissue injury, and the individual’s risk of recurrence.

Immediate Care

• If the kneecap remains dislocated, go to the emergency room immediately
• Reduction: The doctor may administer pain medication and gently guide the kneecap back into place

Nonsurgical Treatment

Most first-time dislocations can be managed without surgery:

• Immobilization: A brace may be used for several weeks to stabilize the knee.
• Weightbearing: Crutches may help reduce pain and protect the knee during early healing.
• Physical therapy: Strengthening the quadriceps and surrounding muscles helps restore stability and motion.
• Recovery timeline: Many people return to normal activity within 6-8 weeks, depending on injury severity.

Ongoing strengthening and low-impact exercises, such as cycling, can help prevent future dislocations.

Patellar Dislocation Surgery

Surgery may be needed if the kneecap repeatedly dislocates, remains unstable despite bracing and therapy or if there are structural abnormalities.

Surgical options include:

• Ligament reconstruction: Repairing or stabilizing the ligaments that hold the kneecap in place
• Knee scope: Minimally invasive surgery using small incisions
• Complex reconstruction: For significant bone or alignment issues

Return to Activity

Individuals can resume activities once knee strength and motion have fully returned. High-demand sports may require a longer recovery period, and confidence in knee stability is an important factor in returning safely. Depending on the specifics of your surgical repair, 2-3 months is a typical range for return to competitive sports.

Treat Patellar Dislocation at OrthoNebraska

If you’re experiencing patellar instability or have recently dislocated your kneecap, OrthoNebraska is here to help. Our team focuses on understanding your symptoms, ensuring your comfort, and guiding you toward an effective treatment plan. With proper care, we can help reduce pain and improve your quality of life.

Schedule Now with a Knee Specialist