The following 2020 study in the UK took a look at TKR surgery results from 4 hospitals and found some interesting statistics regarding what comorbitities a patient has might impact knee stiffness following surgery and the need for a Manipulation Under Anesthetic (MUA).
Risk Factors for Manipulation under Anesthetic (MUA) after Total Knee Arthroscopy
Risk Factors for Manipulation under Anesthetic (MUA) after Total Knee Arthroscopy