Condition
When the kneecap repeatedly dislocates
After the kneecap first dislocates, you may continue to worry about moving the wrong way. Stairs, changing direction or sport may feel unsafe. If the kneecap slips again or repeatedly comes out of its groove, it is worth investigating the causes carefully. The aim is to regain stability and identify possible associated injuries.
What to do after another acute dislocation
If the kneecap is visibly displaced to the side, or the knee is very swollen and barely movable after an injury, immediate medical assessment is needed. Do not try to push the kneecap back yourself or test the leg by walking. Keep it as still as possible and seek medical care. For a severe injury, a cold or pale foot, new pronounced loss of sensation or strength, or if safe transport is not possible, call 112.
Even if the kneecap moves back by itself, the injury should be examined promptly. Stabilising structures or cartilage may have been injured. Booking a routine appointment with us online does not replace this acute assessment. During our opening hours please come directly to us in this situation.
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What dislocation and instability mean
When the knee bends and straightens, the kneecap glides in a groove at the front of the thigh bone. Bone shape, ligaments and muscles work together to make this happen. If the kneecap leaves this groove completely, we call it patellar dislocation. A partial slip is called subluxation.
After a first episode, the stabilising ligament on the inner side in particular may be damaged. Recurrent instability can also be associated with a shallow groove, the height of the kneecap, leg alignment or rotational alignment of the bones. However, not every painful episode of the knee giving way is another dislocation. A precise description of what happened helps distinguish these situations.
Why the course of symptoms and the images belong together
For further assessment, the first episode, the number of subsequent dislocations and any remaining feeling of instability matter. Did the dislocation follow a forceful injury or happen during an everyday movement? Was there substantial swelling, locking or previous surgery?
The examination considers mobility, how the kneecap tracks, leg alignment and muscle control. X-rays can show the bony anatomy. An MRI can help assess the stabilising ligament, cartilage and possible loose bodies in the joint. Specific alignment or rotational investigations are added if they would change the plan. You do not need to arrange these investigations yourself beforehand.
What non-surgical rehabilitation aims to achieve
After acute care, a coordinated rehabilitation programme with physiotherapy and, where appropriate, a suitable brace may be helpful. The aim is to improve mobility, strength and movement control. The plan depends on the injury and the activities you want to be able to return to.
A brace alone does not train safe movement. Equally, exercise cannot simply change a pronounced bony cause. If dislocations recur despite an appropriate gradual programme, the original assessment should be reviewed. Please also tell us about episodes when the kneecap almost slipped out and which movements you avoid because you feel unsure.
When surgical advice is useful
Repeated dislocations, significant associated injuries or a pronounced anatomical cause may be reasons for a specialist surgical assessment. The same operation is not recommended for everyone. Depending on the findings, it may involve reconstructing a stabilising ligament, changing the direction of tendon pull or correcting bone alignment.
The decision takes account of benefits, risks, the course so far and your goals. This includes the demands of rehabilitation and any limitations that may remain even after surgery. A stable kneecap cannot be promised simply by setting an operation date or a general time frame for returning to sport.
Preparing your next step
Bring available accident reports, images and findings, as well as previous operation or rehabilitation plans. An existing brace and information about physiotherapy so far are also helpful. Consider whether the main aim is to manage everyday journeys, physical work or a particular sport safely again.
We want to establish with you which investigation is still needed and which question further specialist advice should answer. This turns recurring uncertainty into a clear plan, without assuming that treatment will be successful.
Frequently asked questions
Does kneecap pain necessarily mean instability?
No. Pain around the kneecap can occur without dislocation. Repeated actual dislocation, a sensation of slipping and pain need to be assessed together.
Can the problem be significant even without severe pain?
Yes. Repeated dislocations can cause associated injuries. Having little pain is therefore not, on its own, a reason to ignore new episodes.
Should I immediately return to the same exercises after another episode?
Have a new injury assessed first. Your existing exercise or rehabilitation plan may need to be adapted to the current findings.
