Kneecap subluxation: understanding this episode of instability and making your return safe

What is a kneecap subluxation?

Kneecap stability anatomy

The kneecap normally glides within a groove in the femur (the trochlea) thanks to the balance between the bony structures, the ligaments holding it on either side, and the quadriceps that centres it with every movement. A subluxation is a partial, temporary displacement of the kneecap out of this groove, most often outward, which generally goes back into place on its own, unlike a complete dislocation, where the kneecap stays displaced.

Why does the kneecap shift?

Subluxation most often occurs during a pivoting movement with the knee flexed, particularly in athletes with an anatomical predisposition (a high-riding kneecap, a shallow trochlea, knock knees) or weakness in the inner quadriceps, which normally plays a key role in centring the kneecap. A first episode increases the risk of recurrence if the underlying factors aren’t addressed.

Which sports contribute to kneecap subluxation?

Sports involving pivoting with the knee flexed carry a particular risk:

• Basketball and handball (pivoting, jump landings)
• Football (sudden changes of direction)
• Dance and gymnastics
• Alpine skiing
• Racquet sports with rapid changes of stance

Treating a kneecap subluxation in rehab with a sports physio

The goal of treatment is to calm the initial episode, then strengthen the structures that naturally centre the kneecap to strongly limit the risk of recurrence.

1. 1Reducing the initial pain and swelling
2. 2Recovering full knee mobility
3. 3Strengthening the quadriceps, particularly its inner portion
4. 4Strengthening the hip to stabilise the pelvis
5. 5Proprioceptive and balance work
6. 6Controlled rotational dynamic stability
7. 7Progressive straight-line running
8. 8Working on changes of direction
9. 9Progressive return to your sport
10. 10Return to competition

Why the physio’s initial assessment matters

During the initial assessment, the physiotherapist aims to understand the precise mechanism of the episode, whether it’s a first episode or a recurrence, and identifies any predisposing factors (knee shape, muscle weakness) that guide the rehab work.

“A kneecap that shifts once isn’t doomed to do it again, as long as you understand why it wasn’t centred well enough that day.”

Strengthening, the cornerstone of treatment

Strengthening the quadriceps, particularly its inner portion (vastus medialis), is essential to better centre the kneecap in its trochlea with every movement. It’s complemented by hip strengthening, because an unstable pelvis increases the risk of the knee moving inward, a factor that contributes to subluxation.

In brief

• Strengthening the quadriceps, particularly its inner portion
• Strengthening the hip to stabilise the pelvis
• Proprioceptive work to make rotational weight-bearing safer
• Gradual return before any pivoting

Should you rest or keep playing sport?

After the initial acute phase, total rest isn’t the answer: it’s better to progressively resume suitable activity while avoiding pivots and rapid changes of direction until inner quadriceps strengthening is sufficiently advanced.

When should you see a specialist for a kneecap subluxation?

A medical opinion is recommended from the first episode, particularly to check for an associated injury (a cartilage fragment, ligament damage) and assess the predisposing anatomical factors. If episodes recur repeatedly, a more thorough assessment may be needed.

The HOPP care programmes to treat your kneecap subluxation and get back to sport

To prevent recurrence, a kneecap subluxation requires rigorous, progressive strengthening of the knee. HOPP offers you a precise exercise programme, allowing you to safely get back to your activities as quickly as possible. By combining mobility, strengthening, proprioception and training management, HOPP supports you all the way back to the field.

The programme runs from 3 to 9 weeks depending on the injury and ends with a reconditioning phase allowing a return to competition in the best possible conditions. Each programme is designed by the HOPP team, made up of two sports physiotherapists who are experts in assessing and treating athletes. You’ll also find theoretical content throughout your progression, so you master every aspect of your recovery and can adjust your treatment independently. If needed, our team of physiotherapists is on hand to support you.

A programme that adapts to you every day

Every day, how you feel (RPE) is factored in to automatically adjust the rest of your programme: more load if all is well, a bit less if your kneecap is complaining. This daily personalisation is what makes the difference compared to a fixed, paper-based programme.

Ready to start your programme?

Join the HOPP support programme designed by sports physios.

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