What it is
It is more common in teenagers and young adults, and in people with loose joints or a shallow groove. Once it has happened, it is more likely to happen again.
Treatment usually involves a brace and physiotherapy to strengthen the muscles that hold the kneecap in place. Surgery may be needed if it keeps happening or if there is damage inside the joint.
Common signs
- The kneecap visibly out of place
- Sudden pain and swelling
- Being unable to straighten the knee or walk
- A feeling of the knee giving way
How it is usually diagnosed
- Examination
- X-ray
- MRI to look for cartilage or ligament damage
Records worth keeping
Keeping these together makes each appointment easier, especially when you see a new doctor:
- X-ray and MRI reports
- Emergency and orthopaedic letters
- Physiotherapy plans
- Dates of any repeat dislocations
Questions to ask your doctor
- Is there damage inside the knee?
- Which exercises will help prevent it happening again?
- When should I consider surgery?
When to get help right away
Call 112 or go to the nearest emergency department if you have:
- A kneecap that stays out of place, or a cold, pale or numb leg: go to an emergency department
This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.