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The Journal of Bone and Joint Surgery, Vol 63, Issue 3 380-383, Copyright © 1981 by Journal of Bone and Joint Surgery, Inc
The carpal tunnel syndrome. A study of carpal canal pressures
RH Gelberman, PT Hergenroeder, AR Hargens, GN Lundborg and WH Akeson
We measured intracarpal canal pressures with the wick catheter in fifteen
patients with carpal tunnel syndrome and in twelve control subjects. The
mean pressure in the carpal canal was elevated significantly in the
patients. When the wrist was in neutral position, the mean pressure was
thirty-two millimeters of mercury. With 90 degrees of wrist flexion the
pressure increased to ninety-four millimeters of mercury, while with 90
degrees of wrist extension the mean pressure was 110 millimeters of
mercury. The pressure in the control subjects with the wrist in neutral
position was 2.5 millimeters of mercury; with wrist flexion the pressure
rose to thirty-one millimeters of mercury, and with wrist extension it
increased to thirty millimeters of mercury. Carpal tunnel release brought
about an immediate and sustained reduction in pressure.

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