How MUA is performed
The patient is anaesthetised and a femoral block may be performed to offer pain relief even after the patient awakes. During the anaesthetic, the surgeon bends and straightens the knee a number of times to break the adhesions. When the knee is able to bend to about 120 degrees it is held flexed for a minute or so. Then the bending and straightening is performed again. After the procedure, motion may be continued with a CPM machine and adequate pain relief.
Timing of manipulation under anaesthesia for stiffness after total knee arthroplasty. Mamarelis G,Sunil-Kumar KH and Khanduja V. Ann Transl Med. 2015 Nov; 3(20): 316.