Background: Anterior Cruciate Ligament (ACL) injury is a common knee injury that may occur due to sudden changes in direction, improper landing, or high-load sports activities. ACL reconstruction is performed to restore knee stability; however, pain, edema, limited Range of Motion (ROM), and decreased functional ability may still occur during the early postoperative phase. These conditions require physiotherapy intervention that is adjusted to the rehabilitation phase. Objective: To determine changes in the patient's clinical condition following phase one right ACL reconstruction after physiotherapy intervention using cryotherapy and exercise therapy. Methods: This study used a case study involving one patient following right ACL reconstruction during phase one rehabilitation. Pain was assessed using the Visual Analog Scale (VAS), ROM was measured using a goniometer, muscle strength was assessed using Manual Muscle Testing (MMT), and knee functional ability was evaluated using the Lysholm Knee Scoring Scale. Physiotherapy interventions consisted of cryotherapy and therapeutic exercise according to the patient's condition during the first postoperative phase. Results: After four physiotherapy sessions, movement pain and tenderness decreased from 5/10 to 2/10. Knee flexion ROM increased from 90° to 110°. Muscle strength remained at grade 4, while the Lysholm Knee Scoring Scale score increased from 19 to 29. Conclusion: Cryotherapy and therapeutic exercise administered over four sessions during phase one following right ACL reconstruction were accompanied by reduced pain, increased knee ROM, and improved functional ability, while muscle strength remained maintained.
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