MRI-Based Identification of an Appropriate Point of Needle Insertion for Patients with Idiopathic Carpal Tunnel Syndrome to Avoid Median Nerve Injury

<table class="table-group" id="tab1"><tr><td><table class="table"><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr class="thead"><td align="left"></td><td align="center">A: FCR</td><td align="center">B: PL</td><td align="center">C: PL&amp;FCU</td><td align="center">D: FCR&amp;FCU</td><td align="center">E: Distal crease</td></tr><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr><td align="left">Normal <svg height="11.1" id="M1" style="vertical-align:-0.17555pt" version="1.1" viewbox="0 0 42.912498 11.1" width="42.912498" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,11.1)">
<g transform="translate(72,-63.12)">
<text transform="matrix(1,0,0,-1,-71.95,63.35)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝑛</tspan>
<tspan style="font-size: 12.50px; " x="9.6773224" y="0">=</tspan>
<tspan style="font-size: 12.50px; " x="21.71771" y="0">4</tspan>
<tspan style="font-size: 12.50px; " x="27.969212" y="0">5</tspan>
</text>
</g>
</g>
</svg> (no PL: 7)</td><td align="center">7 (16%)</td><td align="center">
                *12 (27%)</td><td align="center">0</td><td align="center">1 (2%)</td><td align="center">NA</td></tr><tr><td align="left">CTS <svg height="10.9125" id="M2" style="vertical-align:-0.17555pt" version="1.1" viewbox="0 0 50.724998 10.9125" width="50.724998" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,10.9125)">
<g transform="translate(72,-63.27)">
<text transform="matrix(1,0,0,-1,-71.95,63.5)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝑛</tspan>
<tspan style="font-size: 12.50px; " x="9.6773224" y="0">=</tspan>
<tspan style="font-size: 12.50px; " x="21.71771" y="0">1</tspan>
<tspan style="font-size: 12.50px; " x="27.969212" y="0">8</tspan>
<tspan style="font-size: 12.50px; " x="34.220711" y="0">0</tspan>
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</g>
</svg> (7)</td><td align="center">
                **15 (8%)</td><td align="center">
                *121 (70%)</td><td align="center">7 (4%)</td><td align="center">
                **5 (3%)</td><td align="center">8/71 (11%)</td></tr><tr class="table-tr"><td colspan="6"><hr class="tbody-hr"/></td></tr></table></td></tr><tr class="table-fn"><td><svg height="15.4375" id="M3" style="vertical-align:-3.13504pt" version="1.1" viewbox="0 0 80.724998 15.4375" width="80.724998" xmlns="http://www.w3.org/2000/svg">
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<tspan style="font-size: 12.50px; " x="0" y="0">𝑃</tspan>
<tspan style="font-size: 12.50px; " x="10.9" y="-0.95999998">&lt;</tspan>
<tspan style="font-size: 12.50px; " x="22.927885" y="-0.95999998">0</tspan>
<tspan style="font-size: 12.50px; " x="29.179386" y="-0.95999998">.</tspan>
<tspan style="font-size: 12.50px; " x="32.305138" y="-0.95999998">0</tspan>
<tspan style="font-size: 12.50px; " x="38.556637" y="-0.95999998">0</tspan>
<tspan style="font-size: 12.50px; " x="44.808136" y="-0.95999998">0</tspan>
<tspan style="font-size: 12.50px; " x="51.059635" y="-0.95999998">1</tspan>
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</svg>, <svg height="15.4375" id="M4" style="vertical-align:-3.13504pt" version="1.1" viewbox="0 0 78.637497 15.4375" width="78.637497" xmlns="http://www.w3.org/2000/svg">
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<g transform="translate(72,-59.65)">
<text transform="matrix(1,0,0,-1,-69.87,67.83)">
<tspan style="font-size: 8.75px; " x="0" y="0">∗</tspan>
<tspan style="font-size: 8.75px; " x="4.5772958" y="0">∗</tspan>
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<text transform="matrix(1,0,0,-1,-60.21,61.87)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝑃</tspan>
<tspan style="font-size: 12.50px; " x="10.9" y="-0.95999998">=</tspan>
<tspan style="font-size: 12.50px; " x="22.927885" y="-0.95999998">0</tspan>
<tspan style="font-size: 12.50px; " x="29.179386" y="-0.95999998">.</tspan>
<tspan style="font-size: 12.50px; " x="32.305138" y="-0.95999998">0</tspan>
<tspan style="font-size: 12.50px; " x="38.556637" y="-0.95999998">3</tspan>
<tspan style="font-size: 12.50px; " x="44.808136" y="-0.95999998">6</tspan>
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</svg>. <br/>FCR: through flexor carpi radialis tendon. PL: just ulnar to PL tendon. PL&amp;FCU: 1/2 between PL tendon and FCU tendon. <br/>FCR&amp;FCU: ulnar 1/3 between FCU tendon and FCR tendon. Distal crease: distal wrist crease level in line with the 4th ray. <br/>NA: data not available. Seventy-one patients are available for analysis in entry point E.<br/></td></tr></table>

Rate of contact to the median nerve through 5 different insertion points in normal subjects and CTS patients.

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tab1

Table 1

Table 1: MRI-Based Identification of an Appropriate Point of Needle Insertion for Patients with Idiopathic Carpal Tunnel Syndrome to Avoid Median Nerve Injury 

Table 1 | MRI-Based Identification of an Appropriate Point of Needle Insertion for Patients with Idiopathic Carpal Tunnel Syndrome to Avoid Median Nerve Injury 