Strain and excursion in the rat sciatic nerve during a modified straight leg raise are altered after traumatic nerve injury

Boyd, Benjamin S.; Puttlitz, Christian M.; Gan, Jerylin; Topp, Kimberly

doi:10.1016/j.orthres.2004.11.008

Cited by 51 publications

(42 citation statements)

References 36 publications

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“…This is consistent with human upper limb 16,17 and animal studies. 18 In agreement with earlier work by Daniels et al, 19 ankle dorsiflexion increased strain in the tibial nerve around the ankle (þ3.3%) and resulted in a considerable distal excursion (9.5 mm). With dorsiflexion, the tibial nerve is further challenged by a considerable increase in pressure in the tarsal tunnel, from 4-7 mm Hg in a neutral position to 15-20 mm Hg.…”

Section: Discussionsupporting

confidence: 90%

Strain and excursion of the sciatic, tibial, and plantar nerves during a modified straight leg raising test

et al. 2006

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A modified straight leg raising (SLR) in which ankle dorsiflexion is performed before hip flexion has been suggested to diagnose distal neuropathies such as tarsal tunnel syndrome. This study evaluates the clinical hypothesis that strain in the nerves around the ankle and foot caused by ankle dorsiflexion can be further increased with hip flexion. Linear displacement transducers were inserted into the sciatic, tibial, and plantar nerves and plantar fascia of eight embalmed cadavers to measure strain during the modified SLR. Nerve excursion was measured with a digital calliper. Ankle dorsiflexion resulted in a significant strain and distal excursion of the tibial nerve. With the ankle in dorsiflexion, the proximal excursion and tension increase in the sciatic nerve associated with hip flexion were transmitted distally along the nerve from the hip to beyond the ankle. As hip flexion had an impact on the nerves around the ankle and foot but not on the plantar fascia, the modified SLR may be a useful test to differentially diagnose plantar heel pain. Although the modified SLR caused the greatest increase in nerve strain nearest the moving joint, mechanical forces acting on peripheral nerves are transmitted well beyond the moving joint. ß

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Section: Discussionsupporting

confidence: 90%

Strain and excursion of the sciatic, tibial, and plantar nerves during a modified straight leg raising test

et al. 2006

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“…Neurodynamic mobilization began 10 days after the lesion and was performed on an acrylic platform, according to a previously established protocol 15 . During the procedure, the neck, back, tail and left posterior limb were fixed with belts, while the right posterior limb remained free of movements in the control group, or was treated in accordance with the NM protocol.…”

Section: Neurodynamic Mobilizationmentioning

confidence: 99%

Neurodynamic Mobilization Reduces Intraneural Fibrosis After Sciatic Crush Lesion in Rats

Lima

Santana

Medrado

et al. 2017

BJMHH

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| Peripheral nerve lesions may be associated with abnormal scarring that lead to regenerative failure and dysfunction. Neurodynamic mobilization (NM) imposes controlled mechanical loads on the peripheral nerve and may influence inflammation and collagen deposition after a lesion. However, there is lack of experimental data to support these claims. Objective: To evaluate the impact of NM in the intraneural number of mast cells, collagen deposition and number of blood vessels after an ischiatic crush lesion in rats. Methods: This is a laboratory animal study, where 20 rats (Rattus norvegicus) were randomly divided into two groups, NM (n=10) and control (n=10), submitted to a right ischiatic nerve lesion. A tensioning NM began 10 days after lesion, and was maintained once a day, six times a week, for three weeks. After this period, the animals were euthanized and the nerves assessed for the number of mast cells, collagen area and number of blood vessels. Results: NM led to a lower number of degranulated mast cells (Kruskal-Wallis = 0.29 p<0.05), higher organization of collagen deposition (KruskalWallis = 0.01, p<0.05 ). There was no influence of NM on the number of intraneural blood vessels (KruskalWallis = 0.46 p<0.05). Conclusion: NM started 10 days after a ischiatic nerve crush lesion modulates the inflammatory process and prevents random deposition of collagen at the lesion site, but has no influence on blood vessels formation.

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“…SiRP, strain in reference position; mob, mobilization; *p < 0.05; **p < 0.005; ***p < 0.0005; NS, not significant. bed is elongated, 24,33,34 and, in the case of the tensioning technique, both elongating maneuvers were located distally from the excursion measurement at the level of the humerus, resulting in a cumulative effect.…”

Section: Median Nerve Proximal To the Elbowmentioning

confidence: 99%

Longitudinal excursion and strain in the median nerve during novel nerve gliding exercises for carpal tunnel syndrome

Coppieters

Alshami

2007

Journal Orthopaedic Research

133

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Nerve and tendon gliding exercises are advocated in the conservative and postoperative management of carpal tunnel syndrome (CTS). However, traditionally advocated exercises elongate the nerve bedding substantially, which may induce a potentially deleterious strain in the median nerve with the risk of symptom exacerbation in some patients and reduced benefits from nerve gliding. This study aimed to evaluate various nerve gliding exercises, including novel techniques that aim to slide the nerve through the carpal tunnel while minimizing strain (“sliding techniques”). With these sliding techniques, it is assumed that an increase in nerve strain due to nerve bed elongation at one joint (e.g., wrist extension) is simultaneously counterbalanced by a decrease in nerve bed length at an adjacent joint (e.g., elbow flexion). Excursion and strain in the median nerve at the wrist were measured with a digital calliper and miniature strain gauge in six human cadavers during six mobilization techniques. The sliding technique resulted in an excursion of 12.4 mm, which was 30% larger than any other technique (p ≤ 0.0002). Strain also differed between techniques (p ≤ 0.00001), with minimal peak values for the sliding technique. Nerve gliding associated with wrist movements can be considerably increased and nerve strain substantially reduced by simultaneously moving neighboring joints. These novel nerve sliding techniques are biologically plausible exercises for CTS that deserve further clinical evaluation. © 2007 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 25:972–980, 2007

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Strain and excursion in the rat sciatic nerve during a modified straight leg raise are altered after traumatic nerve injury

Cited by 51 publications

References 36 publications

Strain and excursion of the sciatic, tibial, and plantar nerves during a modified straight leg raising test

Strain and excursion of the sciatic, tibial, and plantar nerves during a modified straight leg raising test

Neurodynamic Mobilization Reduces Intraneural Fibrosis After Sciatic Crush Lesion in Rats

Longitudinal excursion and strain in the median nerve during novel nerve gliding exercises for carpal tunnel syndrome

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