Key Points

Palo Alto Medical Foundation elective hip and knee replacement patients had greater meaningful improvement compared with United States national outcomes from the American Academy of Orthopaedic Surgeons (AAOS) in their 2022 American Joint Replacement Registry (AJRR) Annual Report.

Based on the HOOS, Jr (Hip disability and Osteoarthritis Outcome Score) survey patient-reported outcome measure (PROM), 98.0% of PAMF patients achieved a meaningful improvement after elective primary total hip arthroplasty (non-emergent initial joint replacement) at 12 months after their surgery.

Based on the KOOS, Jr (Knee disability and Osteoarthritis Outcome Score) survey patient-reported outcome measure (PROM), 94.7% of PAMF patients achieved a meaningful improvement after elective primary total knee arthroplasty (non-emergent initial joint replacement) at 12 months after their surgery.

Calculation Information

Calculations were performed utilizing the same methodology as in the 2022 AJRR Annual Report.  Meaningful improvement was calculated by minimal clinical important difference (MCID) determined to be a positive change score of half the pooled standard deviation.  Only patients with a linked postoperative score were included in the analysis (446 hip and 450 knee patients).  PAMF patient surveys included were from Palo Alto, Camino (Los Gatos/Mountain View) and Santa Cruz regions for surgeries from 2016-2020.