caa a22 4500 60545762X CHVBK 20210128100224.0 cr unu---uuuuu 210128e20151201xx s 000 0 eng 10.1007/s00167-014-3205-0 doi (NATIONALLICENCE)springer-10.1007/s00167-014-3205-0 Defining the presence of radiographic knee osteoarthritis: a comparison between the Kellgren and Lawrence system and OARSI atlas criteria [Elektronische Daten] [Adam Culvenor, Cathrine Engen, Britt Øiestad, Lars Engebretsen, May Risberg] Purpose: The Kellgren and Lawrence (K/L) system and Osteoarthritis Research Society International (OARSI) atlas are frequently used to define radiographic knee osteoarthritis (OA). The purpose of the current study was to determine the extent to which tibiofemoral OA rates differ between the K/L system and OARSI atlas criteria and to compare qualitative (K/L and OARSI) and quantitative (millimetres) measures of joint space narrowing (JSN). Methods: Posteroanterior radiographs of 1,178 knees, from 621 individuals with varying severity of OA, were graded by a trained physician with the K/L system (grade 0-4) and the OARSI atlas (osteophytes/JSN graded 0-3). Using the K/L system, the presence of OA was defined with the traditional cut-off of ≥grade 2 (definite osteophyte and possible JSN) and an alternative cut-off of at least a definite osteophyte alone (≥grade 2/osteophyte). For the OARSI atlas, OA was considered present if the sum of osteophytes or JSN ≥grade 2, or grade 1 JSN occurred in combination with grade 1 osteophyte. Minimum joint space width (mJSW) was measured manually in millimetres. Results: According to the K/L system (≥grade 2), 167 knees (14.2%) had tibiofemoral OA and 203 (17.3%) had ≥grade 2/osteophyte. In contrast, 309 knees (26.2%) had tibiofemoral OA according to OARSI atlas criteria. K/L and OARSI JSN descriptions were significantly associated with mJSW (p<0.022). Conclusions: Radiographic tibiofemoral OA was almost twice as common using OARSI atlas criteria compared with the K/L system. This discrepancy is likely to contribute to the large variability of OA prevalence observed in the literature and is important for clinicians to consider when diagnosing radiographic OA. The cut-off for defining radiographic knee OA using the two systems should not be considered comparable. Level of evidence: III. Springer-Verlag Berlin Heidelberg, 2014 Radiographic nationallicence Osteoarthritis nationallicence Knee nationallicence Kellgren and Lawrence nationallicence OARSI nationallicence Classification nationallicence Culvenor Adam Division of Physiotherapy, School of Health and Rehabilitation Sciences, The University of Queensland, 4072, Brisbane, QLD, Australia aut Engen Cathrine Department of Sports Medicine, Norwegian School of Sports Science, Sognsvannsveien 220, 0806, Oslo, Norway aut Øiestad Britt Department of Orthopaedic Surgery, Norwegian Research Centre for Active Rehabilitation (NAR), Oslo University Hospital, Pb. 3843, Ullevål Stadion, 0805, Oslo, Norway aut Engebretsen Lars Department of Orthopaedic Surgery, Oslo University Hospital, Pb. 4950, Nydalen, 0424, Oslo, Norway aut Risberg May Department of Sports Medicine, Norwegian School of Sports Science, Sognsvannsveien 220, 0806, Oslo, Norway aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/12(2015-12-01), 3532-3539 0942-2056 23:12<3532 2015 23 167 https://doi.org/10.1007/s00167-014-3205-0 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00167-014-3205-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Culvenor Adam Division of Physiotherapy, School of Health and Rehabilitation Sciences, The University of Queensland, 4072, Brisbane, QLD, Australia aut NATIONALLICENCE 700 1- Engen Cathrine Department of Sports Medicine, Norwegian School of Sports Science, Sognsvannsveien 220, 0806, Oslo, Norway aut NATIONALLICENCE 700 1- Øiestad Britt Department of Orthopaedic Surgery, Norwegian Research Centre for Active Rehabilitation (NAR), Oslo University Hospital, Pb. 3843, Ullevål Stadion, 0805, Oslo, Norway aut NATIONALLICENCE 700 1- Engebretsen Lars Department of Orthopaedic Surgery, Oslo University Hospital, Pb. 4950, Nydalen, 0424, Oslo, Norway aut NATIONALLICENCE 700 1- Risberg May Department of Sports Medicine, Norwegian School of Sports Science, Sognsvannsveien 220, 0806, Oslo, Norway aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/12(2015-12-01), 3532-3539 0942-2056 23:12<3532 2015 23 167