Baseline data: ultrasound-detected osteophytes in joints assessed as (A) normal, (B) doubtful OA or (C) definite OA on radiographs, as well as in (D) clinical normal joints
| (A) n (%) Ultrasound-detected osteophytes in joints without radiographic OA (KLG=0) | (B) n (%) Ultrasound-detected osteophytes in joints with doubtful radiographic OA (KLG=1) | (C) n (%) Ultrasound-detected osteophytes in joints with radiographic OA (KLG=2–4) | (D) n (%) Ultrasound-detected osteophytes in clinical normal joints (bony enlargement=0) | |
| All joints | 86/301 (28.6) | 117/186 (62.9) | 926/1021 (90.7) | 392/717 (54.7) |
| DIP 2–5 | 25/47 (53.2) | 34/52 (65.4) | 475/511 (93.0) | 135/192 (70.3) |
| PIP 2–5 | 40/184 (21.7) | 43/79 (54.4) | 295/349 (84.5) | 147/350 (42.0) |
| IP-1 | 18/48 (37.5) | 30/36 (83.3) | 66/67 (98.5) | 60/95 (63.2) |
| CMC-1 | 3/22 (13.6) | 10/19 (52.6) | 90/94 (95.7) | 50/80 (62.5) |
CMC, carpometacarpal joints; DIP, distal interphalangeal joints; IP, interphalangeal joints; KLG, Kellgren-Lawrence grade; PIP, proximal interphalangeal joints.