Ultrasound identification and size determination of the palmaris longus tendon

: Since the palmaris longus tendon is subject to a wide range of anatomical variations (in 10% of the cases, aplasia is observed), the identification and determination of its length and thickness is of importance for the pre-operative planning of ligament reconstructive surgery. Thirty healthy volunteers aged between 6 and 50 years were examined using high-resolution 10-12 MHz US probes. We determined the length and thickness of the tendon, and its relationship to the median nerve in the distal region of the forearm. Thanks to the dynamic nature of the examination and the typical tendinous echo structure, the palmaris longus tendon was accurately identified by US in both children and adults. Ultrasonography is highly suitable for the identification of the palmaris longus tendon and aids the pre-operative planning of ligament reconstructions.