• Pain or hyperesthesia at the shoulder, wrist, or hand out of proportion to the injury.
• Limitation of motion develops. Typically, the shoulder develops limitation in a capsular pattern with most restriction in lateral rotation and abduction. In the wrist and hand, the most common restrictions are limited wrist extension and metacarpophalangeal and proximal interphalangeal […]

• Stage I: acute/reversible stage.
This stage of vasodilation lasts 3 weeks to 6 months. Pain, the predominant feature, is usually out of proportion to the severity of the injury. There is hyperhidrosis, warmth, erythema, rapid nail growth, and edema in the distal extremity.
• Stage II: dystrophic or vasoconstriction (ischemic) stage.
This stage lasts 3 to 6 […]

Common synonyms used in the past for RSD include shoulder-hand syndrome, Sudeck’s atrophy, reflex neurovascular dystrophy, traumatic angiospasm or vasospasm, and sympathetically maintained pain (SMP). SMP is frequently a component of CPRS but is not a distinct diagnosis in itself. Pain is a key feature; other symptoms and signs may include sensory abnormalities (spontaneous burning […]

CRPS type I (reflex sympathetic dystrophy)
• Develops after an initiating noxious event
• Spontaneous pain or allodynia/hyperalgesia
• Edema, vascular abnormalities
• Abnormal sudomotor activity
• Non-nerve origin
CRPS type II (causalgia) 
• Develops after nerve injury
• Not limited to territory of injured nerve
• Edema; skin blood flow abnormality
• Abnormal sudomotor activity
Clinical Features of CRPS (in addition to the differences […]