DOS 2020

DOS Kongressen 2020 · 95 The Rosenberg view can replace standardized coronal plane stress radiography in the diagnostic process for Uni-compartmental and Total knee replacements. Jacob Mortensen, Andreas Kappe, Lasse Rasmussen, Svend Erik Østgaard, Anders Odgaard Orthopedic Department, Hip & Knee Unit, Gentofte Hospital; Orthopedic Department, Hip & Knee Unit, Aalborg University Hospital; Orthopedic Department, Hip & Knee Unit, Vejle Sygehus Background: Choosing the optimal radiographic methods to diagnose knee os- teoarthritis could save both the radiation and cost in the diagnostic process, when considering either a unicompartmental or total knee replacement. Purpose / Aim of Study: To evaluate and compare the Rosenberg view and standardized varus/valgus stress radiography, this study measured joint space width by determining intra- and interrater agreement and test-retest reliability of radiographs in patients with knee osteoarthritis. Materials and Methods: A prospective study, including 73 patients. Radiographs were taken with the Rosenberg view and coronal stress radiog- raphy with the Telos stress device. Repeated measurements were performed. Experienced knee surgeons performed measurements of joint space width (JSW) and minimal joint space width (mJSW). Three measurement rounds al- lowed for test-retest reliability and Intra- and Interrater agreement. Coronal stress measurements were compared to the Rosenberg view in the relevant corresponding compartment of the knee. Findings / Results: A total of 12,264 measurements were performed. The radiographic methods proved substantial reliability. Among raters, Intra- and interrater agreement showed substantial to almost perfect agreement. A very strong correlation was observed in the medial knee compartment (ρ= 0.91; CI = 0.84- 0.95 ; p< 0.001) when comparing JSW between the Rosenberg view and Varus stress. A Strong correlation was observed in the lateral knee compart- ment (ρ = 0.83 ; CI = 0.71-0.89 ; p < 0.001) when comparing mJSW between the Rosenberg view and Valgus stress. Conclusions: The Rosenberg view can replace 20° coronal valgus-varus stress radiography, saving the cost of equipment, additional radiographs, specialized staff, and time to set up the device, and potentially increasing hospital cost- effectiveness. 81.