Order of Total Hip or Total Knee Arthroplasty Does Not Affect Length of Stay or Discharge Disposition in Patients With Coexisting Hip and Knee Arthritis.

Primary total joint arthroplasty (TJA) of the hip and knee are effective procedures for improving pain and function in patients with arthritis. This study examined whether order of surgery (TKA or THA first) affects length of stay (LOS) and discharge disposition among patients with coexisting knee and hip arthritis. A total joint arthroplasty database review was performed to collect all available data for arthroplasties performed at 2 campuses of a single institution between July 2013 and April 2017. Inclusion criteria were patients who underwent both primary THA and TKA within 18 months and were age 18 years or older. Patients were divided into 2 groups based on whether THA or TKA was performed first. For all procedures, the following data were collected: age, body mass index (BMI), time between cases, LOS, discharge disposition, and the number of 90-day adverse postoperative events. Adverse 90-day events included deep infection, fracture, hardware failure, urinary tract infection, other return to the operating room, emergency department visit, readmission, or death. A total of 211 patients underwent both THA and TKA within 18 months; 124 patients underwent THA first and 87 underwent TKA first. There was no difference in age or BMI between the 2 groups. There was a significantly longer time between the first and second arthroplasty in patients with TKA first by a mean of 2 months (P=.001). There was no difference in 90-day adverse postoperative events following THA whether done first or second (P=.371), and no difference in 90-day events following TKA whether done first or second (P=.524). There was no difference in discharge disposition (P=.833 and P=.395) or LOS (P=.695 and P=.473) between groups for the first or second procedure, respectively. In a patient with coexisting hip and knee arthritis, the current results do not support recommending THA or TKA first based on cost related to LOS and discharge disposition. [Orthopedics. 2019; 42(6):e528-e531.].