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J Man Manip Ther. 2019 Jul;27(3):162-171. doi: 10.1080/10669817.2019.1568699. Epub 2019 Feb 20.

The relative risk to the femoral nerve as a function of patient positioning: potential implications for trigger point dry needling of the iliacus muscle.

Author information

1
a Atrium Health , Carolinas Rehabilitation , Charlotte , NC , USA.
2
b NxtGen Institute of Physical Therapy , Atlanta , GA , USA.
3
c Myopain Seminars , Bethesda , MD , USA.
4
d ProMove PT Pain Specialists , Bethesda , MD , USA.
5
e Department of Physical Therapy , Baylor University , Dallas , TX , USA.
6
f Department of Physical Therapy , South College , Knoxville , TN , USA.
7
g Hospital Provincial de Toledo , Physical Therapy Unit , Toledo , Spain.
8
h Orlando Mayoral Clinica de fisiotherapia , Madrid , Spain.
9
i Seminarios Travell y Simons® , Toledo , Spain.
10
j Physical therapy practice for disorders of neck, shoulder and upper extremity , Groningen , Netherlands.
11
k MSK Masters , Cincinnati , OH , USA.
12
l General Musculoskeletal Imaging, Inc , Cincinnati , OH , USA.
13
m Novant Health , Charlotte , NC , USA.
14
n USA MEDDAC Guthrie Ambulatory Health Care Clinic , Fort Drum , NY , USA.

Abstract

Objectives: Prudent dry needling techniques are commonly practiced with the intent to avoid large neurovascular structures, thereby minimizing potential excessive bleeding and neural injury. Patient position is one factor thought to affect the size of the safe zone during dry needling of some muscles. This study aimed to compare the size of the needle safe zone of the iliacus muscle during two different patient positions using ultrasound imaging. Methods: The distance from the anterior inferior iliac spine (AIIS) to the posterior pole of the femoral nerve was measured in 25 healthy participants (11 male, 14 female, mean age = 40) in both supine and sidelying positions using a Chison Eco1 musculoskeletal ultrasound unit. The average distance was calculated for each position and a two-tailed, paired t-test (α < 0.05) was used to examine the difference between positions. Results: The mean distance from the AIIS to the posterior pole of the femoral nerve was statistically greater with participants in the sidelying position (mean[SD] = 35.7 [6.2] mm) than in the supine position (mean[SD] = 32.1 [7.3] mm, p < .001). Discussion: Although more study is needed, these results suggest that patient positioning is one of several potential variables that should be considered in the optimization of patient safety/relative risk when performing trigger point dry needling. Level of Evidence: Level 4 (Pre-Post Test).

KEYWORDS:

Trigger point; dry needle; iliacus; patient position; risk; safety

PMID:
30935326
PMCID:
PMC6598541
[Available on 2020-07-01]
DOI:
10.1080/10669817.2019.1568699

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