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. 2024 Jul 16;13(14):4137. doi: 10.3390/jcm13144137

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© 2024 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Areas of wrists and hands affected by RA illustrated by the 2016 updated Rheumatoid Arthritis Magnetic Resonance Imaging Score (RAMRIS) [17], assessed for bone erosion, joint space narrowing, osteitis, synovitis, and tenosynovitis, including extensor and flexor tendon compartments. Flexor Tendon Areas: 1: Flexor carpi radialis. 2: Flexor pollicis longus (tendon) within the radial bursa. 3: Ulnar bursa, which includes the tendon quartets of flexor digitorum profundus and superficialis. Extensor Tendon Compartments: I: Includes extensor pollicis brevis and abductor pollicis longus. II: Comprises extensor carpi radialis brevis and extensor carpi radialis longus. III: Extensor pollicis longus. IV: Extensor digitorum communis and extensor indicus proprius. V: Extensor digiti quinti proprius. VI: Extensor carpi ulnaris. Legend: RU = radio-ulnar joint; RC = radio-carpal joints; IC-CM = inter-carpal and carpo-metacarpal joints.