Knee cruciate ligament injury is a common injury (15 000 per year in France) which concerns young sportsmen. Consequences are limitation in physical and sporting activities and at work.

Main objective: to compare water and traditional rehabilitation after cruciate ligament injury reconstruction in terms of kinematics of recovery and of proprioceptive abilities development.

Secondary objectives: to compare algo-functional and sport, social and job come back date between both groups.

Multicentric randomised trial comparing two therapy protocols in knee cruciate ligament injury.

After surgery, 2 weeks rehabilitation; 3 weeks conventional rehabilitation (group 1) or rehabilitation in water (group 2).

Data will be collected at inclusion (before surgery), 2 weeks, 1 month, 2 months and 6 months after surgery.

Inclusion Criteria:

• Adults,
• 18-49 years,
• indication of knee anterior cruciate ligament reconstruction.

Exclusion Criteria:

• other recent lower limb sprain,
• history of neurological disease (stroke, central or peripheral degenerative disease),
• psychtrope or antihypertensive drugs,
• aquatic activities contra-indication (cutaneous).