Post operative stiffness is a possible complication following rotator cuff tendon repair. This can result in loss of movement and increasing pain in the shoulder. The commonest reason for this is because the attempted repair results in an unbalance shoulder. Hence the healing potential of rotator cuff tendon needs to be carefully assessed prior to surgery.
Any surgical or invasive procedure carries risks. Before proceeding, you should seek a second opinion from an appropriately qualified health practitioner.