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Carpal tunnel syndrome

Role of carpal canal size

From the Departments of Neurology (Dr. Bleecker), Radiology (Drs. Bohlman and Tipton), and Occupational Medicine (Drs. Bleecker and Ms. Moreland), Johns Hopkins Medical Institutions, Francis Scott Key Medical Center, Baltimore, MD.

Carpal canal size was examined as a risk factor associated with carpal tunnel syndrome in the workplace. Seven of 14 electricians had symptomatic carpal tunnel syndrome. On measuring cross-sectional areas by CT, affected workers had a cross-sectional area of 1.75 ± 0.21 cm²; control values were 2.53 ± 0.15 cm² (p < 0.05). Individuals with a subclinical syndrome had an area of 1.83 ± 0.22 cm², similar to the symptomatic group. Wrist circumference was not a predictor of smallest carpal canal area. Unusual bony and soft tissue structures within the carpal canal were easily identified with CT.

Address correspondence and reprint requests to Dr. Bleecker, Johns Hopkins Medical Institution, Department of Neurology, Francis Scott Key Medical Center, Room 122B, 4940 Eastern Avenue, Baltimore, MD 21224.

Accepted for publication February 20, 1985.

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