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Mechanics of Psoas Tendon Snapping. A Virtual Population Study

Lookup NU author(s): Ajay MalviyaORCiD



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


© Copyright © 2020 Audenaert, Khanduja, Claes, Malviya and Steenackers.Internal snapping of the psoas tendon is a frequently reported condition, especially in young adolescents involved in sports. It is defined as an increased tendon excursion over bony or soft tissue prominence causing local irritation and inflammation of the tendon leading to groin pain and often is accompanied by an audible snap. Due to the lack of detailed dynamic visualization means, the exact mechanism of the condition remains poorly understood and different theories have been postulated related to the etiology and its location about the hip. In the present study we simulated psoas tendon behavior in a virtual population of 40,000 anatomies and compared tendon movement during combined abduction, flexion and external rotation and back to neutral extension and adduction. At risk phenotyopes for tendon snapping were defined as the morphologies presenting with excess tendon movement. There were little differences in tendon movement between the male and female models. In both populations, abnormal tendon excursion correlated with changes in mainly the femoral anatomy (male r = 0.72, p < 0.001, female r = 0.66, p < 0.001): increased anteversion and valgus as well as a decreasing femoral offset and ischiofemoral distance. The observed combination of shape components correlating with excess tendon movement in essence presented with a medial positioning of the minor trochanter. This finding suggest that psoas snapping and ischiofemoral impingement are possibly two presentations of a similar underlying rotational dysplasia of the femur.

Publication metadata

Author(s): Audenaert EA, Khanduja V, Claes P, Malviya A, Steenackers G

Publication type: Article

Publication status: Published

Journal: Frontiers in Bioengineering and Biotechnology

Year: 2020

Volume: 8

Online publication date: 27/03/2020

Acceptance date: 13/03/2020

Date deposited: 30/04/2020

ISSN (electronic): 2296-4185

Publisher: Frontiers Media S.A.


DOI: 10.3389/fbioe.2020.00264


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EA was financially supported by a senior research fellowship from the Research Foundation Flanders.