ESSKA Consensus: Managing a First-Time Kneecap Dislocation
What Is This Guideline?
A first-time patellar dislocation (FTPD) – where the kneecap completely slips out of its groove – is the starting point of kneecap instability. It is most common in young people, particularly during the teenage growth spurt, and is rare in adults over 25. The reported incidence varies widely, between 10 and 150 per 100,000 people per year.
In 2024, the European Society of Sports Traumatology, Knee Surgery and Arthroscopy (ESSKA) published a formal consensus guideline on the management of first-time kneecap dislocation. A steering group of 12 leading European experts developed a series of clinical questions and evidence-based statements, which were then reviewed and scored by an independent panel of 24 experienced clinicians. Every statement required 100% agreement within the steering group, plus formal scoring by the rating panel, before being accepted.
This page summarises the key findings and recommendations from the consensus in patient-friendly terms.
Key Recommendations
1. Understanding What Caused the Dislocation
Not all kneecap dislocations are the same. The consensus highlights an important principle: there is an inverse relationship between the force needed to dislocate the kneecap and the severity of the underlying anatomy. In other words, if the kneecap dislocated during a relatively minor movement (such as simply turning on the spot), it usually means there are more significant structural risk factors in the knee. A dislocation that occurred during a high-energy injury (such as a direct blow) may have fewer underlying risk factors.
The known anatomical risk factors include:
- Trochlear dysplasia – a shallow or abnormally shaped groove for the kneecap
- Patella alta – a kneecap that sits higher than normal
- Malalignment – abnormal rotation or angulation of the leg bones
- Lateralised tibial tubercle – the attachment point of the kneecap tendon sitting too far to the outside
Other factors such as young age, joint hyperlaxity, and family history also play a role. When treating children, a first-time dislocation can sometimes be the first sign of an undiagnosed condition such as Ehlers–Danlos syndrome.
2. Clinical Examination
Examination immediately after the injury can be difficult due to pain and swelling. The consensus recommends repeating the clinical examination once the acute phase has settled (days to weeks later). The recommended assessment includes:
- Standing evaluation for knee alignment and rotation
- Assessment of knee range of motion and the J-sign (a visible lateral shift of the kneecap during extension)
- The apprehension test and patellar glide test
- Prone examination for rotational deformity of the hip and leg
The expert panel emphasised that clinical examination alone is not sufficient to decide on treatment. Imaging is always needed.
3. Imaging Is Mandatory
The consensus is clear: every patient with a first-time kneecap dislocation needs imaging. As a minimum, this means X-rays (front, side, and skyline views) and an MRI, or MRI alone if it can be arranged promptly. The key reasons are:
- Osteochondral fractures (cartilage and bone fragments knocked loose during the dislocation) occur in 25–75% of cases and are especially common in children and teenagers. These can be missed on examination alone and, if left untreated, may cause further joint damage.
- Risk factor assessment – MRI allows accurate measurement of the groove shape, kneecap height, ligament damage, and alignment to help estimate the risk of it happening again.
- In studies, up to 50–75% of first-time dislocations were misdiagnosed or overlooked at the initial clinical evaluation.
If the clinical examination suggests rotational or angular deformity of the legs, additional imaging such as CT or long-leg X-rays may be needed.
4. Treatment: A Shift Away from “Conservative for Everyone”
Historically, non-surgical treatment (physiotherapy and bracing) was considered the standard approach for all first-time dislocations. The ESSKA consensus challenges this, based on growing evidence.
In adults
The expert panel recommends that treatment should be individualised based on a thorough assessment of risk factors, using one of the published scoring systems. Key findings from the evidence review:
- After non-surgical treatment, the average redislocation rate is approximately 48%. After surgery, this drops to approximately 17–24%.
- Functional outcome scores also tend to favour surgical treatment, particularly when MPFL reconstruction (rebuilding the ligament on the inner side of the kneecap) is performed.
- The consensus recommends that primary surgical reconstruction should be considered as a first option in patients who have several risk factors, ongoing symptoms, or cartilage damage – rather than waiting for a second dislocation before offering surgery.
In children and adolescents
Recurrence rates in young patients treated without surgery are particularly high, ranging from 30–70%, with the youngest patients at greatest risk. The consensus states that non-surgical treatment cannot be supported as the standard approach for every child. Skeletally immature patients need thorough investigation of their anatomy, an individual risk assessment, and a careful discussion with the patient and family about the options.
5. Bracing
There is no strong evidence that any type of brace is better than no brace after a first-time dislocation. If a brace is used in the acute phase, the consensus recommends only a brief period with unrestricted range of motion, rather than rigid immobilisation. Prolonged splinting or casting can cause muscle wasting and stiffness without reducing the risk of redislocation.
6. Physiotherapy
Despite limited high-quality evidence, the expert panel recommends physiotherapy-guided rehabilitation for all patients, whether treated surgically or not. The focus should be on:
- Quadriceps and gluteal muscle strengthening
- Range of motion exercises
- Gait re-education
- Functional neuromuscular control
- Sport-specific training where appropriate
Physiotherapy may be most effective in patients with fewer underlying anatomical abnormalities, since structural issues such as significant rotational deformity can limit how much muscle training alone can compensate.
7. When Surgery Should Be Considered
The consensus recommends considering surgery for first-time dislocations when:
- There is a cartilage or osteochondral fracture that needs fixation or removal
- There are multiple anatomical risk factors (e.g. trochlear dysplasia combined with patella alta)
- A validated risk scoring system predicts a high chance of redislocation
- The patient has ongoing symptoms of instability or pain despite initial management
This represents a significant shift from the traditional approach of reserving surgery only for patients who dislocate a second time.
Why Does This Guideline Matter?
This ESSKA consensus provides the most comprehensive expert-reviewed framework to date for managing first-time kneecap dislocations. The key message for patients is that a “one size fits all” approach is no longer appropriate. Each patient’s anatomy, injury pattern, and risk of recurrence should be carefully assessed with imaging, and the treatment plan should be individualised accordingly.
For younger patients in particular, the high recurrence rates after non-surgical treatment mean that early specialist assessment and a frank discussion about the potential benefits of surgery are important.
Read the Full Consensus Document
The complete consensus document is published by ESSKA and freely available on their education platform.
Read the full ESSKA consensus document (PDF) →
ESSKA European Management of First-Time Patellar Dislocation Consensus: Copyright © ESSKA
This summary is written for general information and explains the consensus guidelines in patient-friendly terms. It does not replace individual medical advice. If you have experienced a kneecap dislocation or have concerns about kneecap instability, please get in touch to arrange a consultation.
