Location of the Flexor Carpi Radialis Myotendinous Junction: a Cadaveric Study

K. Panwar, D. Lara, M. Trzeciak, E. G. Huish Jr
Original Article, 756-758
doi: 10.32098/mltj.04.2021.20
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SUMMARY
Background. The flexor carpi radialis (FCR) tendon is frequently selected for use as an interposition graft, for tendon transfers, and as a landmark for volar forearm approaches. Original surgical techniques of FCR harvest recommend incision placement 10 cm proximal to wrist crease. To date no anatomic study has been conducted to precisely define the location of the FCR myotendinous junction.
Methods. 5 fresh frozen cadavers were dissected, exposing the full length of the FCR. The radial styloid (RS) was selected as a distal anatomic landmark, the medial epicondyle (ME) was chosen as a proximal landmark. All measurements were taken along the length of the FCR tendon. As the FCR myotendinous junction is chevron shaped, we marked both the proximal myotendinous junction (PMT) and distal myotendinous junction (DMT), with the DMT indicating the beginning of purely tendinous FCR. Four measurements were taken for each arm: 1) RS to DMT, 2) RS to PMT, 3) ME to PMT, 4) ME to DMT.
Results. Pearson correlation coefficient comparing tendinous length of the FCR to the overall forearm length was 0.896 indicating a strong positive correlation (p = 0.040). The mean ratio of tendinous FCR length to forearm length was 0.42 ± 0.05, ranging from 0.38 to 0.50. This correlated to a distance 11.7 ± 2.3 cm proximal from the radial styloid.
Conclusions. This study demonstrates the location of the myotendinous junction of the FCR. Our results suggest incision placement 10 cm from proximal wrist crease to be unreliable in forearms too short or too long. Instead, we recommend measuring 40% of the length from RS to ME as a more consistent marker for FCR harvest.

Keywords: cadaveric study, Flexor Carpi Radialis, myotendinous junction, tendon harvest, volar forearm anatomy,

Table of Content: Vol. 11 (No.4) 2021 October/December

  1. Clinical and Histologic Manifestations of a Novel Rectus Femoris Myotendinous Junction Injury in Rats

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  6. Whole-Body Vibration, Morphological and Antioxidant Effects on the Diaphragm Muscle of Obese Rats

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  13. Functional Performance of Ankles Between Male and Female Practitioners of Resistance Exercise

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  20. Location of the Flexor Carpi Radialis Myotendinous Junction: a Cadaveric Study

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    doi: 10.32098/mltj.04.2021.20
    Full text PDF

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