Type 1 or Type 2 CRPS: Which description matches Type 1?

• A. Type 1 is most common and presents with diffuse pain not limited to a single nerve
• B. Type 2 is most common and presents with diffuse pain
• C. Type 2 involves autoimmune features
• D. Type 1 is caused by nerve transection

Answer: (A)

Type I CRPS is defined by the absence of a measurable nerve injury and tends to produce diffuse, widespread pain across the affected limb rather than pain confined to a single nerve distribution. This makes it the more common form and aligns with the description that Type I is most common and presents with diffuse pain not limited to a single nerve. In contrast, Type II CRPS follows a known nerve injury and the pain is typically localized to the distribution of that injured nerve. The other statements—Type II being the most common, autoimmune features, or Type I caused by nerve transection—do not fit the established distinction between the two types.