Strength Isometric Test: Prone Hip External RotationSep 06, 2023
Here is a general overview of the testing protocol for prone hip external rotation (ER) isometric strength:
- Have the client adopt a prone position on a massage table, with the testing leg flexed at the knee to 90 degrees.
- It is recommended that the practitioner set themselves up on the contralateral side of the massage table to conduct this test.
- The practitioner should manually bring the client’s leg into roughly 5 degrees of hip internal rotation, then using the Muscle Meter, place it just above the client’s medial malleolus.
- Fix the client’s femur on the table to prevent unnecessary hip abduction, before queuing them to externally rotate, pressing against the Muscle Meter as best they can for 2-3 seconds until peak force is achieved.
- Upon completion, hit save on the Measurz app and compare to the opposite side.
Normative data for hip external rotation isometric strength with a handheld dynamometer can vary depending on several factors, including age, sex, and functional level. Additionally, different studies may use different units of measurement, such as torque or force.
Here are a few examples of normative data reported in the literature:
- One study of healthy young adults aged 18-30 years reported average peak torque values of 23.2 Nm (±6.7) for males and 13.7 Nm (±4.1) for females (Katz-Leurer et al., 2009).
- Another study of healthy young adults aged 20-30 years reported peak force values of 17.9 kgf (±3.3) for males and 11.8 kgf (±2.1) for females (Kawczynski et al., 2020).
- A study of healthy older adults aged 65-89 years reported peak torque values of 7.7 Nm (±3.6) for males and 4.6 Nm (±2.2) for females (Molloy et al., 2010).
- Katz-Leurer, M., Rotem, H., Keren, O., & Meyer, S. (2009). Hand-held dynamometry in patients with hip fracture: reliability and validity of measurements of muscle strength. Journal of Rehabilitation Medicine, 41(7), 572-576.
- Kawczynski, A., Stastny, P., Petr, M., & Mostowik, A. (2020). Inter-rater reliability and measurement error of isometric hip strength measurements using a hand-held dynamometer. Journal of Human Kinetics, 73(1), 55-62.
- Molloy, D. W., Richardson, J. K., Crilly, R. G., & MacIntyre, D. L. (2010). A comparison of isometric, isotonic concentric and isotonic eccentric hip abductor and external rotator torque in healthy older adults. Archives of Gerontology and Geriatrics, 51(3), e90-e93.
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