Patients that meet the inclusion criteria and that are sent for carpal tunnel release surgery will be consented and examined on the day of surgery. Their US results, external palmar measurements as well as the amount of overlying muscle will be recorded as well as demographic data. Demographic information, occupational history, history of hand diagnoses and procedures as well as history pertinent to CTS (nighttime numbness and tingling, pain, perceived pinch weakness, and duration of symptoms) will be collected. Results of nerve conduction testing (NCT) will be recorded.