Locomotor Recovery in Spinal Cord Injury Can Be Assessed Using Weight-Bearing.

Area of Science:

• Neuroscience
• Biomedical Engineering
• Rehabilitation Science

Background:

• Spinal cord injury (SCI) impairs locomotor function, necessitating reliable outcome measures.
• Current gold-standard scales (Basso, Beattie, and Bresnahan; Basso Mouse Scale) are observer-dependent, potentially introducing bias.
• Observer-independent methods are crucial for enhancing reproducibility and reducing bias in SCI research.

Purpose of the Study:

• To evaluate the Advanced Dynamic Weight Bearing (ADWB) system as an observer-independent method for assessing locomotor recovery after contusive SCI in rodents.
• To determine if ADWB measurements correlate with established observer-dependent scales.

Main Methods:

• Contusive spinal cord injury (SCI) was induced in rodents.
• Locomotor recovery was assessed using the Advanced Dynamic Weight Bearing (ADWB) system to measure weight distribution and surface area.
• Weight-bearing changes were analyzed over time and correlated with Basso Mouse Scale (BMS) scores.

Main Results:

• Early after SCI, mice exhibited altered weight distribution, shifting weight to front paws and trunk/tail, with reduced rear paw usage.
• As recovery progressed, weight shifted away from front paws, but did not return to pre-injury levels.
• ADWB-measured changes in weight distribution strongly correlated with BMS scores, indicating its validity.

Conclusions:

• The ADWB system provides a viable, observer-independent method for quantifying locomotor recovery after SCI.
• This objective approach can reduce bias and improve the reproducibility of SCI research.
• ADWB measurements reflect injury severity and functional recovery, complementing traditional assessment scales.