Comparison of Initial Treatment for Carpal Tunnel Syndrome Related to Rheumatic Diseases: Corticosteroid Injection Versus Nighttime Splinting

Inclusion Criteria: 1. Patients aged no less than 18 years old with unilateral or bilateral carpal tunnel syndrome diagnosed by a specialist according to the Katz diagnostic criteria, and with at least one associated rheumatic disease; 2. Patients have had symptoms of CTS for at least six weeks, and the side with more severe symptoms is designated as the target side for the study. 3. During the current episode, the target side has not been treated. Exclusion Criteria: 1. Patients who have plan for surgical treatment on his or her CTS within the following 6 months; 2. Received corticosteroid injections in the wrist within the past 6 months; 3. Patients who are unable to wear a splint due to trauma or other reasons; 4. Patients with clinical manifestations or electrophysiological changes indicative of significant axonal loss or denervation, including thenar muscle atrophy, sensory loss (two-point discrimination greater than 8 mm), absence of SNAP (sensory nerve action potential), absence of CMAP (compound muscle action potential) in the thenar muscles, etc.; 5. Patients who require long-term use of any form of opioids. 6. Patients who have used opioids (e.g., tramadol) or neuropathic pain medications (gabapentin, pregabalin, etc.) within the past 2 weeks; 7. Patients who have received non-recommended wrist injection treatments (e.g., 5% glucose, platelet-rich plasma, ozone, chitosan, hyaluronic acid, etc.) within the past 6 months; 8. Patients who have undergone non-recommended physical therapies (e.g., electrotherapy, magnetotherapy, laser therapy, etc.) within the past 6 months; 9. Patients who are pregnant or plan to become pregnant within the next 6 months.