Imageless robotic-assisted total knee arthroplasty accurately restores the radiological alignment with a short learning curve: a randomized controlled trial.

Purpose: The study compared a novel imageless robotic-assisted total knee arthroplasty (RATKA) and conventional TKA by considering (1) radiological outcomes, (2) outliers of radiological outcomes, and (3) learning curve.

Methods: This prospective randomized controlled study performed by a single surgeon evaluated 152 patients (152 knees): 75 patients undergoing RATKA and 77 patients undergoing conventional TKA. Mechanical alignment, radiological implant positioning, and outliers were analyzed for radiological outcomes.

Indwelling urinary catheterization was unnecessary in non-drainage total knee arthroplasty: a randomized controlled trial.

Purpose: To investigate whether catheterization remains necessary in non-drainage total knee arthroplasty (TKA) using combined spinal epidural anesthesia (CSEA) with a short-acting opioid by comparing (1) incidences of postoperative urinary retention (POUR), and (2) postoperative clinical outcomes between retained urinary catheter (UC) and non-retained urinary catheter (non-UC) groups.

Methods: A total of 230 patients underwent non-drainage TKA using CSEA with fentanyl were randomized into UC and non-UC groups (115 patients each, 115 knees each). Incidences of POUR, clinical outcomes (intraoperative intravenous fluid, operative time, whole blood loss, urinary tract infection (UTI), and length of stay) were evaluated after the operation, while range of motion (ROM) and Knee society score (KSS) were evaluated 3- and 6-month postoperatively.