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Functional and morphological assessment of a standardized rat sciatic nerve crush injury with a non-serrated clamp.
J Neurotrauma 2004; 21(11):1652-70JN

Abstract

Peripheral nerve researchers frequently use the rat sciatic nerve crush as a model for axonotmesis. Unfortunately, studies from various research groups report results from different crush techniques and by using a variety of evaluation tools, making comparisons between studies difficult. The purpose of this investigation was to determine the sequence of functional and morphologic changes after an acute sciatic nerve crush injury with a non-serrated clamp, giving a final standardized pressure of p = 9 MPa. Functional recovery was evaluated using the sciatic functional index (SFI), the extensor postural thrust (EPT) and the withdrawal reflex latency (WRL), before injury, and then at weekly intervals until week 8 postoperatively. The rats were also evaluated preoperatively and at weeks 2, 4, and 8 by ankle kinematics, toe out angle (TOA), and gait-stance duration. In addition, the motor nerve conduction velocity (MNCV) and the gastrocnemius-soleus weight parameters were measured just before euthanasia. Finally, structural, ultrastructural and histomorphometric analyses were carried out on regenerated nerve fibers. At 8 weeks after the crush injury, a full functional recovery was predicted by SFI, EPT, TOA, and gait-stance duration, while all the other parameters were still recovering their original values. On the other hand, only two of the histomorphometric parameters of regenerated nerve fibers, namely myelin thickness/axon diameter ratio and fiber/axon diameter ratio, returned to normal values while all other parameters were significantly different from normal values. The employment of traditional methods of functional evaluation in conjunction with the modern techniques of computerized analysis of gait and histomorphometric analysis should thus be recommended for an overall assessment of recovery in the rat sciatic nerve crush model.

Authors+Show Affiliations

Department of Veterinary Sciences, CETAV, University of Trás-os-Montes e Alto Douro, Vila Real, Portugal. avarejao@utad.ptNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15684656

Citation

Varejão, Artur S P., et al. "Functional and Morphological Assessment of a Standardized Rat Sciatic Nerve Crush Injury With a Non-serrated Clamp." Journal of Neurotrauma, vol. 21, no. 11, 2004, pp. 1652-70.
Varejão AS, Cabrita AM, Meek MF, et al. Functional and morphological assessment of a standardized rat sciatic nerve crush injury with a non-serrated clamp. J Neurotrauma. 2004;21(11):1652-70.
Varejão, A. S., Cabrita, A. M., Meek, M. F., Bulas-Cruz, J., Melo-Pinto, P., Raimondo, S., ... Giacobini-Robecchi, M. G. (2004). Functional and morphological assessment of a standardized rat sciatic nerve crush injury with a non-serrated clamp. Journal of Neurotrauma, 21(11), pp. 1652-70.
Varejão AS, et al. Functional and Morphological Assessment of a Standardized Rat Sciatic Nerve Crush Injury With a Non-serrated Clamp. J Neurotrauma. 2004;21(11):1652-70. PubMed PMID: 15684656.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Functional and morphological assessment of a standardized rat sciatic nerve crush injury with a non-serrated clamp. AU - Varejão,Artur S P, AU - Cabrita,António M, AU - Meek,Marcel F, AU - Bulas-Cruz,José, AU - Melo-Pinto,Pedro, AU - Raimondo,Stefania, AU - Geuna,Stefano, AU - Giacobini-Robecchi,Maria G, PY - 2005/2/3/pubmed PY - 2005/4/29/medline PY - 2005/2/3/entrez SP - 1652 EP - 70 JF - Journal of neurotrauma JO - J. Neurotrauma VL - 21 IS - 11 N2 - Peripheral nerve researchers frequently use the rat sciatic nerve crush as a model for axonotmesis. Unfortunately, studies from various research groups report results from different crush techniques and by using a variety of evaluation tools, making comparisons between studies difficult. The purpose of this investigation was to determine the sequence of functional and morphologic changes after an acute sciatic nerve crush injury with a non-serrated clamp, giving a final standardized pressure of p = 9 MPa. Functional recovery was evaluated using the sciatic functional index (SFI), the extensor postural thrust (EPT) and the withdrawal reflex latency (WRL), before injury, and then at weekly intervals until week 8 postoperatively. The rats were also evaluated preoperatively and at weeks 2, 4, and 8 by ankle kinematics, toe out angle (TOA), and gait-stance duration. In addition, the motor nerve conduction velocity (MNCV) and the gastrocnemius-soleus weight parameters were measured just before euthanasia. Finally, structural, ultrastructural and histomorphometric analyses were carried out on regenerated nerve fibers. At 8 weeks after the crush injury, a full functional recovery was predicted by SFI, EPT, TOA, and gait-stance duration, while all the other parameters were still recovering their original values. On the other hand, only two of the histomorphometric parameters of regenerated nerve fibers, namely myelin thickness/axon diameter ratio and fiber/axon diameter ratio, returned to normal values while all other parameters were significantly different from normal values. The employment of traditional methods of functional evaluation in conjunction with the modern techniques of computerized analysis of gait and histomorphometric analysis should thus be recommended for an overall assessment of recovery in the rat sciatic nerve crush model. SN - 0897-7151 UR - https://www.unboundmedicine.com/medline/citation/15684656/Functional_and_morphological_assessment_of_a_standardized_rat_sciatic_nerve_crush_injury_with_a_non_serrated_clamp_ L2 - https://www.liebertpub.com/doi/full/10.1089/neu.2004.21.1652?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -