Cross-sectional comparison of extended anteroposterior and posteroanterior fixed-flexion positioning to assess radiographic osteoarthritis at the knee: The Johnston County Osteoarthritis Project

摘要

PurposeTo compare values for Kellgren-Lawrence (K-L) grade, joint space narrowing (JSN), and osteophytes (OST) in anteroposterior (AP) extended and fixed-flexion posteroanterior (PA-FF) radiographs obtained during a single clinic visit (the first follow-up of the Johnston County Osteoarthritis Project (JoCo OA)).