2.3.3. CPM and Rehabilitation
pain
Automatic knee joint movement was started on the day after surgery depending on pain, and CPM was started on postoperative day 2. The following instruments were used: ARTROMOT-K1 (Medireha GmbH, Umkirch, Germany) and Spectra (Kinetec Medical Products, Aldershot, UK). CPM was performed once a day for 20 min each time. The setting angle was determined by flexing the knee before the start of CPM therapy and gradually increasing the angle depending on the patient's pain tolerance. Other postoperative rehabilitation procedures were performed according to the same protocol for both groups. The load was increased as the patients' pain and motor function improved.