tailieunhanh - báo cáo khoa học: " Thumb force deficit after lower median nerve block"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Thumb force deficit after lower median nerve block | Journal of NeuroEngineering and Rehabilitation Research Thumb force deficit after lower median nerve block Zong-Ming Li Daniel A Harkness and Robert J Goitz BioMed Central Open Access Address Hand Research Laboratory Departments of Orthopaedic Surgery and Bioengineering University of Pittsburgh PA 15213 USA Email Zong-Ming Li - zmli@ Daniel A Harkness - dah11@ Robert J Goitz - goitzrj@ Corresponding author Published 19 October 2004 Received 30 August 2004 Journal of NeuroEngineering and Rehabilitation 2004 1 3 doi 1743-0003-1-3 Accepted 19 October 2004 This article is available from http content 1 1 3 2004 Li et al licensee BioMed Central Ltd. This is an open-access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Purpose The purpose of this study was to characterize thumb motor dysfunction resulting from simulated lower median nerve lesions at the wrist. Methods Bupivacaine hydrochloride was injected into the carpal tunnel of six healthy subjects to locally anesthetize the median nerve. Motor function was subsequently evaluated by measuring maximal force production in all directions within the transverse plane perpendicular to the longitudinal axis of the thumb. Force envelopes were constructed using these measured multidirectional forces. Results Blockage of the median nerve resulted in decreased force magnitudes and thus smaller force envelopes. The average force decrease around the force envelope was . A maximum decrease of occurred in a direction combining abduction and slight flexion while a minimum decrease of occurred in a direction combining adduction and slight flexion. Relative decreases in adduction extension abduction and flexion were and respectively. Areas .