Orthopedic surgeons and physical therapists frequently rank procedures based on post-operative pain, required immobilization periods, and complex rehabilitation demands. Major surgeries universally cited among the most difficult to recover from include spinal fusion, total hip or knee replacements, complex shoulder arthroplasty, open heart surgery (coronary artery bypass graft), and major abdominal or bariatric resections. Each of these procedures involves extensive incisions, bone cutting, or deep tissue trauma, necessitating prolonged, disciplined rehabilitation protocols.