Cross-Sectional Area of the Carpal Canal Proximal and Distal to the Wrist Flexion Crease

Segmental Carpal Canal Pressure in Patients With Carpal Tunnel Syndrome

“…12 The narrowest region of the carpal canal was from 4 mm distal to 6 mm proximal to the DWC. Because 10 mm proximal to the DWC was out of the bottleneck area of the carpal canal, the carpal canal pressure at 10 mm proximal to the DWC would be low even in patients with CTS.…”

Release of the Transverse Carpal Ligament Alone Is Associated With Elevated Pressure Beneath the Distal Volar Forearm Fascia in a Cadaver Model of Carpal Tunnel Syndrome

“…In 2005, Morimoto et al performed a crosssectional MRI study of the carpal canal. 18 They found that there was no significant increase in crosssectional area proximal to the DVWC for 21 mm to 25 mm. They proposed that antebrachial fascia release may be necessary to fully decompress the median nerve, given this relatively constricted area proximal to the DVWC, although they did not note a specific focal area of volume reduction to establish the exact extent of release needed.…”

The Anatomical Site of Constriction of the Median Nerve in Patients with Severe Idiopathic Carpal Tunnel Syndrome

“…However, Pierre–Jerome et al (1997) found no statistically significant difference between the cross sectional area of the carpal tunnel in patients with idiopathic carpal tunnel syndrome and healthy controls. Morimoto et al (2005) studied the cross-sectional area of the carpal canal using Magnetic Resonance Imaging in 13 cases and found that the narrowest cross-sectional area of the canal was, on average 4 mm distal to the distal wrist crease. This corresponds to the most proximal part of the flexor retinaculum and not to the carpal tunnel at the level of the hook of the hamate.…”

“…This corresponds to the most proximal part of the flexor retinaculum and not to the carpal tunnel at the level of the hook of the hamate. Other authors identified the smallest cross-sectional area of the carpal canal as lying between 2 and 2.5 cm distal to the proximal end of the canal (Bleecker et al, 1985; Robbins, 1963), which is more distal than the findings of Morimoto et al (2005). This discrepancy may be related to the technique of measurement and whether, or not, the tunnel of the flexor carpi radialis at the level of the hook of the hamate is included in the cross-sectional area.…”