A cadaveric study for the volar needle approach to the pronator quadratus using the palmaris longus tendon landmark

초록

Introduction: Our aim in this work was to determine the safety and accuracy of thevolar approach to the pronator quadratus (PQ) through cadaver dissection. Methods: Twenty upper limbs from 10 fresh cadavers were investigated. At the level3 cm proximal to the ulnar styloid process (USP), a needle was inserted just medial tothe palmaris longus (PL) tendon. Distances of the median nerve (MN) and ulnar artery(UA) from the needle insertion point (IP) were measured using ultrasonography andcadaver dissection. Results: The PQ was located at a depth of 10.8-19.9 mm from the skin and had amedian thickness of 9.1 mm, measured 3 cm proximal to the USP. The median dis-tances of the MN and UA from the IP were 7.6 and 13.4 mm, respectively. Discussion: A needle insertion for the volar approach to the PQ was safe at 3 cmproximal to the USP, just medial to the PL tendon.

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