The investigators measure intraoperative repair tension for each participant in 0° and 40° abduction in gram with a spring balance. Then, measurement of healing rate of these tendon reconstructions over one year. The investigators do three regular follow-ups. In week 6 and month 4, control of healing with ultrasound and one year postoperative with an MRI scan. Intraoperative repair tension is correlated with retear rate. Cut-off value to separate high risk and low risk tension repairs is evaluated.