Gait compensations in rats after a temporary nerve palsy quantified using temporo-spatial and kinematic parameters.
BACKGROUND
The aim of this work was to test a method for measuring the gait of rats with sufficient sensitivity to detect subtle locomotor changes due to pathology, injury and recovery.


METHODS
The gait of female Sprague-Dawley rats was assessed using an optical motion tracking system and the DigiGait™ imaging system during normal locomotion, shortly after temporary nerve block to the left hind limb and after full recovery.


RESULTS
The effect of low treadmill speeds (10-30 cm/s) was initially investigated. Significant changes were detected in the spatiotemporal gait parameters, consistent with those previously reported. The overall ranges of motion in the hip, knee and ankle joints were 37.5° (±7.1°), 50.2° (±9.4°) and 61.6° (±9.1°) and did not appear to change with speed, indicating that for low speed variations, kinematic comparisons across speeds may be possible. Following the induction of a temporary sciatic nerve block, the range of motion of the left ankle and knee during swing decreased by 23° and 33°, respectively (p<0.05). A compensatory change of a greater range of motion at the hip was noted in the contralateral limb (p<0.01). 90 min post injection, most of the gait parameters had returned to normal, however, minor walking deficits were still present.


CONCLUSIONS
Discriminant analysis showed that a combination of dynamic and kinematic parameters provides a more robust method for the classification of gait changes.


CONCLUSIONS
This more detailed method, employing both dynamic analysis and joint kinematics simultaneously, was found to be a reliable approach for the quantification of gait in rats.
Department of Bioengineering, Imperial College London, South Kensington Campus, SW7 2AZ UK; The Royal British Legion Centre for Blast Injury Studies at Imperial College London, South Kensington Campus, SW7 2AZ UK. Electronic address: theofano.eftaxiopoulou06@ic.ac.uk.
Theofano
T
Eftaxiopoulou
Department of Bioengineering, Imperial College London, South Kensington Campus, SW7 2AZ UK.
Warren
W
Macdonald
Department of Bioengineering, Imperial College London, South Kensington Campus, SW7 2AZ UK.
David
D
Britzman
Department of Bioengineering, Imperial College London, South Kensington Campus, SW7 2AZ UK; The Royal British Legion Centre for Blast Injury Studies at Imperial College London, South Kensington Campus, SW7 2AZ UK.
Anthony M J
AM
Bull
D000704:Analysis of Variance; D000779:Anesthetics, Local / Q000494:pharmacology; D000818:Animals; D001696:Biomechanical Phenomena; D016009:Chi-Square Distribution; D005121:Extremities / Q000294:innervation / Q000503:physiopathology; D005260:Female; D020233:Gait Disorders, Neurologic / Q000175:diagnosis* / Q000209:etiology*; D007596:Joints / Q000503:physiopathology; D008012:Lidocaine / Q000494:pharmacology; D009038:Motion; D051381:Rats; D017207:Rats, Sprague-Dawley; D020426:Sciatic Neuropathy / Q000139:chemically induced / Q000503:physiopathology*
D000779:Anesthetics, Local; D008012:Lidocaine
Gait analysis; Joint angles; Nerve palsy; Temporo-spatial parameters