ABSTRACT
Inability to achieve adequate range of motion (ROM) after total knee arthroplasty (TKA) represents a frustrating complication for both patient and surgeon. Manipulation under anesthesia is indicated in TKA having less than 90 degrees ROM after six weeks, with no progression or regression in ROM. A modified technique has evolved for patients with chronic regional pain syndrome (CRPS) symptoms or persistent stiffness after standard manipulation. A retrospective review was conducted to determine the efficacy of the modified technique, which uses epidural anesthesia continued for postoperative analgesia, hospital stay of one to three days, continuous passive motion (CPM) for two to three days, and daily physical therapy (PT). Between 1997 and 2003, 5714 TKAs were performed in 4106 patients. Manipulation using a standard technique was performed on 334 (5.8%) knees in 273 patients. Manipulation using a modified technique was performed on 65 (1%) knees in 60 patients. Age averaged 58 years and body mass index (BMI) averaged 34.39. Follow up averaged 18.4 months. ROM improved significantly from 71 degrees to 102 degrees (p < 0.0001). Knee Society pain, function, and total clinical scores all improved significantly (all p < 0.0001). Successful results were observed in 48 (74%) knees. Four (6%) additional knees achieved a successful result after a subsequent manipulation. Nine (14%) knees required component revision for treatment of persistent arthrofibrosis, which included one full revision, five polyethylene exchanges, and three revisions of femoral component and polyethylene. Two significant complications occurred: one subdural hematoma and one death due to pulmonary embolism. Although not without complications, manipulation under epidural anesthesia represents a viable option for treatment of persistent stiffness after TKA; 80% of these difficult cases achieved successful results.