Prospective controlled clinical trial in which a minimally invasive microsurgical approach was used following the keyhole principle in 55 patients and 65 hands under local anesthesia and ambulatory strategy. All patients included in the study had an average of 3 months disease course and were considered refractory to conservative treatment. Patients were evaluated with stringent inclusion criteria with the Levine severity and functional status scale with a 2 year follow-up. Descriptive outcomes on the efficiency of this procedure are reported.

Prospective clinical study to analyze 55 patients with carpal tunnel syndrome treated with open minimally invasive approach in 65 hands, using local anesthesia without tourniquet and in an ambulatory setting.

Inclusion Criteria:

• Patients with confirmed diagnosis who had neurologic exam, electromyography, cervical spine X rays showing no structural disturbances and with at least 3 months of persistent pain refractory to medical management and physical therapy.

Exclusion Criteria:

• Patients with a history of direct trauma or orthopedic lesions in the carpal region, endocrine and/or metabolic disturbances (hypothyroidism, diabetes) and those that had previous local administration of steroids were excluded.