A kneecap that slips out of its groove needs medical assessment, even if it moves back by itself. The injury can damage the supporting ligament or cartilage, and the next decision depends on the pattern of damage and the risk of another dislocation. PRP should not be presented as a substitute for assessing those mechanical problems.
Patellar instability is different from general pain around the front of the knee. Describing every painful kneecap as an injection problem risks missing a first dislocation, a loose cartilage fragment or a structural reason for repeated episodes.
What needs urgent assessment?
If the kneecap remains visibly out of position, seek emergency care. Do not try to force it back yourself. Severe pain, a cold or numb foot, major deformity or an inability to move safely also requires urgent care. A true knee-joint dislocation is a different, potentially limb-threatening injury and should never be managed through a routine enquiry.
After a kneecap has returned to position, prompt assessment still matters, particularly with a large swelling, inability to bear weight or a knee that catches or locks. Pain settling does not show whether cartilage has been injured. Do not return to twisting sport simply because the kneecap looks normal again.
Discuss an appropriate assessment in London
Why does the kneecap dislocate?
The patella normally tracks in a groove at the end of the thighbone. Ligaments, muscles and bone shape help keep it aligned. A twist, awkward fall or blow can cause a dislocation. Some people also have anatomical features that increase recurrence risk, such as a shallow groove, a high-riding kneecap or altered limb alignment.
The medial patellofemoral ligament helps prevent excessive sideways movement. Injury to this ligament can be part of the problem, but it is not the only factor. That is why a plan based solely on strengthening one muscle or injecting a painful point may be incomplete.
What should the assessment establish?
Tell the clinician whether this was the first episode, whether it moved back itself and whether earlier episodes involved swelling or a clear displacement. Bring previous scans, operation details and rehabilitation plans. Your sport, work and experience of the knee giving way also matter.
Examination assesses movement, stability and alignment. AAOS describes X-rays and, when appropriate, MRI to assess cartilage or bone fragments, ligaments and the knee's anatomy. CT may have a role when bony alignment needs further definition. The best scan is the one that answers the question affecting treatment.
Ask for a clear distinction between pain, apprehension that the patella will slip and a documented dislocation. These experiences can overlap, but the diagnosis and the goal of treatment should be explicit.
Discuss an appropriate assessment in London
Does every first dislocation need surgery?
No. However, neither should every first dislocation automatically receive the same conservative plan. The ESSKA 2024 formal consensus, published in 2025, recommends individual decisions based on recurrence risk, ongoing symptoms and cartilage or osteochondral injury. Rehabilitation remains an important part of care, whether treatment is surgical or nonsurgical.
This is a useful update to a simplistic rule that the first dislocation never needs surgery. It is not a recommendation that everyone should have an operation. Age, skeletal maturity, anatomy, injury findings and personal demands influence the discussion. Some recommendations rely on limited evidence and expert agreement, which the consensus acknowledges.
A specialist may consider stabilisation surgery for recurrent instability or selected high-risk first episodes. A cartilage fragment can change the plan. Ask what the operation is intended to correct and how the expected benefits compare with its risks and rehabilitation requirements.
What should rehabilitation achieve?
A programme should restore movement, strength, control and confidence, then progress towards the demands of work or sport. It should be matched to the injury and treatment, rather than copied from a generic knee-pain routine. Bracing may be considered in a plan, but it should not be described as proven long-term protection for everyone.
Return should be based on recovery and agreed functional criteria, not just a date in the diary. Tell your clinician if the knee repeatedly slips, catches or swells during rehabilitation. Persistent instability needs review rather than indefinitely repeating the same exercises.
Can PRP prevent another dislocation?
There is no established basis for promising that PRP will correct a shallow groove, alter bony alignment or replace a required ligament reconstruction. Evidence from knee osteoarthritis or tendon pain does not establish benefit for recurrent patellar dislocation. The relevant question is whether an injection addresses this diagnosis and treatment goal.
A high-quality consultation may recommend rehabilitation or specialist assessment without an injection. Keeping the pathway focused on stability and cartilage protection is more useful than adding a procedure because the knee remains painful.
What should private care in London include?
Look for a clear explanation of scan findings, individual recurrence risk, a rehabilitation plan and a route to specialist care if needed. London Cartilage lists a £1,200 single injection/procedure category including PRP. This is another provider's market example, not our price, a patellar-instability package or proof that PRP is suitable.
Ask The London PRP Clinic to confirm the appropriate appointment, location, availability, complete fee and review arrangements. Acute dislocation needs urgent care first. Any surgery, imaging or treatment proposal should be separately explained and agreed before commitment.
Discuss an appropriate assessment in London
Sources and evidence limits
- AAOS: unstable kneecap
- ESSKA formal consensus: first-time patellar dislocation, Part2
- London Cartilage: published pricing
Sources checked 2 November 2026. Guidance informs assessment, not a diagnosis for an individual. Research results do not guarantee benefit. This article is general information, not personal medical advice. Do not delay urgent care while waiting for an appointment or message reply.