Proprioception is assessed by Joint Position Sense (JPS) test :

Error between target angle and established angle: average absolute error in relation to the target angle in degrees. This will enable us to obtain an average absolute error for the three trials for each target angle per lower limb and per patient.

Measurement of displacements of the center of pressure and gravity, angular velocities (trunk, knee, hip, ankle), hip and knee angular moments, ground reaction force (for each lower limb).

Analysis of ground reaction force on healthy side vs. pathological side during ascent and descent of step, knee joint amplitudes in flexion during ascent and descent of step.

• Analysis of obstacle-crossing accuracy (minimum foot-to-obstacle distance and distance covered by the lower limb, taking the center of the ankle as reference, until the obstacle is crossed).
• Analysis of variability: Variability in the position of the center of the ankle when passing the obstacle + variability in the trajectory of the lower limb (hip and knee angles + angular velocity of the hip and knee).
• Analysis of movement symmetry: Symmetry between the legs, based on the vertical distance foot-obstacle during clearance, and on the similarity index based on angles and angular velocity of the hip, knee and trunk.

EQ5D-5L questionnaire

The KSS is a functional questionnaire (e.g. questions on pain, joint amplitude, possible walking distance) completed by the patient and the surgeon.

The SKV score is a very simple functional score, based on a single question: "How would you rate your knee on the day of the examination, compared with a normal knee in percentage terms?" completed by the patient.

KOOS is a questionnaire assessing knee function, pain and impact on daily life score to be completed exclusively by the patient. The questionnaire comprises five dimensions: symptoms, stiffness, pain, function of daily life and activities, sports and leisure.