DOS 2019

DOS Kongressen 2019 · 175 Does Pre-Operative Pattern of Knee Osteoarthritis Affect Patient-Reported Outcomes in Total Knee Arthroplasty? Veronique Vestergaard, Yhan Emid Colon Iban, Vincent P Galea, Christopher Melnic, Hany Bedair, James I 3rd Huddleston, Charles R Bragdon, Henrik Malchau, Anders Troelsen Harris Orthopaedics Laboratory, Department of Orthopaedic Surgery, Massachusetts General Hospital; Department of Orthopaedic Surgery, Massachusetts General Hospital; Department of Orthopaedic Surgery, Stanford University; Department of Orthopaedic Surgery, Clinical Orthopaedic Research Hvidovre, Copenhagen University Hospital Hvidovre Background: Patient-reported outcome measures i.e. Knee Injury and Osteoarthritis Outcome Score (KOOS) validly measure surgical outcome. Knowing if knee osteoarthritis (OA) compartment patterns affect KOOS is essential for risk-stratification and TKA- outcome evaluation. Purpose / Aim of Study: Analyze: 1)association between knee OA patterns and patient demographics as well as pre-operative KOOS 2)whether knee OA patterns are associ- ated with post-operative KOOS Materials and Methods: An international multicenter study included 391 TKA patients (median age:65.0; 65.0% females). Compartment OA in pre-operative anterior- pos- terior and lateral/sunrise radiographs with Kellgren-Lawrence grade III/IV and joint- space width<2.5mm were classified into 5 groups: 1)medial 2)medial+patellofemoral, 3)lateral 4)lateral+patellofemoral and 5)medial+lateral (bi- compartmental) or bi- compartmental+patellofemoral (tri- compartmental). KOOS Symptoms, Pain, Function in Daily Living (ADL), Sports and Recreation (Sports/Rec) and Quality of Life (QOL) were collected pre-, 1-, 3- and 5-years post-operatively. Findings / Results: 282 patients had medial, 46 medial+patellofemoral, 34 lateral, 7 lateral+patellofemoral, and 22 bi/tri- compartmental OA. Patient demographics were similar in all groups; however, bi/tri- compartmental OA patients had fewer females. Medial OA patients had the lowest ADL scores pre-operatively. Medial+patellofemoral OA patients reported the least pain at 5-years. Lateral OA patients reported the lowest Sports/Rec scores at 3-5 years. Lateral+patellofemoral OA patients reported the low- est scores in all subscales except for KOOS Sports/Rec at 5-years and the most pain at 3-5 years. Bi/tri-compartmental OA patients reported the lowest Symptoms score pre- operatively, but reported the highest 1-year scores. At 5-years, these patients reported the highest score in all but the Pain subscale. Conclusions: Presence of patellofemoral OA is not associated with pre-operative KOOS in patients with medial and lateral OA patterns, possibly diminishing the clini- cal importance of patellofemoral OA in the knee arthroplasty setting. Lateral OA and lateral+patellofemoral OA patients report lower post- operative KOOS signifying that these cases present with unique surgical challenges. 131.