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Background and Aims To evaluate the efficacy and security of the interscalene catheter for the rehabilitation of the stiff shoulder after arthoscopic surgery.Methods We performed a prospective review of serie of cases undergoing arthroscopic shoulder surgery for shoulder stiffness. An interscalene catheter was placed preoperatively to facilitate early, pain-free physiotherapy. Postoperatively, a continuous infusion of levobupivacaine 0.125% at 2 mL/h was maintained. Prior to each physiotherapy session, a 10 mL bolus of lidocaine 2% was administered through the catheter. Follow-up was conducted during hospitalization until hospital discharge through patient interviews and clinical evaluation of the block. Patient satisfaction was evaluated using a 1-to-10 numerical rating scale.Results 4 patients were included. Bolus of lidocaine 2% achieved full sensory and motor blockade allowing effective analgesia during rehabilitation. The average patient satisfaction score was 8 out of 10. No complications related to the catheter or anesthetic technique were observed. All patients were discharged between 48 and 72 hours after surgery.Conclusions The use of an interscalene catheter in the postoperative recovery is safe and enables active physiotherapy without pain, potentially reducing the risk of persistent stiffness and improving functional outcomes.