Assessment of Disability Compensation With the C-LEG COMPACT 2 Knee (Ref. 3C60 et 3C60=ST)

This test consists of recording the amount of time needed for a person to stand up from a chair, walk 3 metres, make a half-turn and sit down again. The TGUG test score reflects a person's balance and as a consequence, the risk of falling.

Time frame: Measurement will be performed at 3 months with 3C60 and at 1 month with NMPK

The Locomotor Capabilities Index (LCI-5) is a 14 item self-assessment questionnaire filled in by the patient that explores walking and ambulation. The LCI-5 is derived from the Prosthesis Profile of the Amputee Questionnaire (PPA). LCI-5 is sensitive to the use of walking aids or to the need of a third party. Ceiling effect is not expected with moderately active amputees. The global LCI-5 score is the addition of the 14 scores, noted between 0 and 4. The global score varies between 0 and 56, the highest being for persons with high locomotors capabilities. LCI-5 has two sub-scores: the basic score corresponds to 7 questions related to basic activities and the advanced score corresponds to 7 questions related to more advanced activities. The basic and advanced scores both range from 0-28. Higher scores correspond with a better outcome.

Time frame: Measurement will be performed at 3 months with 3C60 and at 1 month with NMPK

Time frame: Measurement will be performed at 1 month with both devices

It is a self-evaluation questionnaire of the user's satisfaction, translated in French (ESAT) and in German (QUEST 2.0-G Section 17.5). The QUEST 2.0 questionnaire contains 8 items that evaluate the device's technology and 4 items that evaluate services surrounding the device. It allows patients to express themselves on the criteria that are most important to them. Each item has a score that varies between 0 (not satisfied at all) and 5 (very satisfied). The global score is the average obtained onto the 12 items. Two sub-scores related to the technology and services can also be calculated. They correspond to the average of the 8 first items and to the 4 last items respectively. All scores ranks between 0 and 5, 5 being the highest level of satisfaction.

Time frame: Measurement will be performed at 3 months with 3C60 and at 1 month with NMPK

36-Item Short Form Health Survey (SF-36v2TM) explores 8 dimensions of quality of life through 36 questions: PF= Physical Functioning (10 items), RP= Role Physical (4 items), BP = Bodily Pain (2 items), SF= Social Functioning (2 items), MH= Mental Health (5 items), RE= Role emotional (3 items), VT= Vitality (4 items), GH= General Health (5 items). All of the eight health domain scales contributes with different levels to score two component summary measures: PCS= Physical Component Summary and MCS= Mental Component Summary. All scores are calculated online through scoring software. Domain scales and component summary are ranging from 0 to 100. A high score is considered to be a better outcome, as indicating little or no problem.

Time frame: Measurement will be performed at 3 months with 3C60 and at 1 month with NMPK

The type of walking aids used with each device will be recorded.

Time frame: Measurement will be performed at 3 months with 3C60 and at 1 month with NMPK

Population: No significant difference in the repartition of walking aids was - a priori- expected between both devices: NMPK and 3C60.