Assessment of surgical correction of patello-femoral instability by EOS 3D kinematics

Patella instability induces repetitive patella dislocation, which impairs day-to-day life. Surgery is commonly used to stabilise the patella during knee flexion. However proofs of efficacy of surgery on patello-femoral kinematics have not yet been found. Analysis of the patello-femoral kinematics is crucial to understand, assess et correct the patella instability. The investigators have developed, validated and published a 3D analysis method from biplanar X-rays (EOS 3D imaging). Our aim in this study is to assess the correction of the patello-femoral kinematics after surgery using the EOS 3D imaging method.

Inclusion Criteria:

• Age above 15 years and 3 months (minimal age to be allowed for adult orthopedic surgery in the hospital)
• Patients with patello-femoral instability (at least one patella dislocation)
• Patients with corrective surgery planned
• Patients must be covered by public health insurance
• Signed informed consent form by the patient or by the parents or legal guardian of the patient (if patient is under 18)

Exclusion Criteria:

• Previous existing surgery for patella instability on the same knee
• Previous existing surgery on the extensor apparatus of the knee
• Female patients with pregnancy
• Patients deprived of liberty by administrative or court order