Total knee arthroplasty is very successful although the clinical assessment and rated outcome does not always match the patients reported satisfaction. One reason for patient dissatisfaction is less than desired range of motion. Poor postoperative motion inhibits many functional activities and may create a perception of dysfunction. Early in the postoperative period when patients are having trouble regaining motion (usually 6–8 weeks), manipulation under anesthesia can be used to advance range of motion by manually lysing adhesions. Comorbidities have been used as predictors for outcome in total knee arthroplasty in population health studies. Likewise, predicting which patients are most susceptible to early postoperative stiffness/manipulation would be valuable for patient education and to predict outcome. Prospectively collected data was retrieved from the hospital's MARCQI database (Michigan Arthroplasty Collaborative Quality Initiative) for the years 2014–2018. There were 3098 primary total knees performed during the study period and 139 manipulations (4.44%). The registry specifically abstracts patients’ preoperative comorbidities, operative data, and 90-day postoperative complications.Introduction
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