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Radiographic joint scoring: 16 joints were assessed per hand (32 joints per patient). Individual radiographic features were scored per joint for the severity of OA as normal, and 1+, 2+ and 3+ change (blinded to both the PET and arthro-PET images) using the Altman radiographic scoring method, and the total radiographic joint score was calculated. IPJ interphalangeal joint (D distal, P proximal), CMC carpometacarpal joint, STT scaphotrapeziotrapezoidal joint
