Validation of Estimators for Weight-Bearing and Shoulder Joint Loads Using Instrumented Crutches

Area of Science:

• Biomechanics
• Rehabilitation Engineering
• Medical Instrumentation

Background:

• Traditional gait analysis requires expensive equipment like motion capture and force platforms, limiting accessibility.
• Accurate measurement of lower limb and shoulder joint loads is crucial for monitoring patient recovery and preventing complications.

Purpose of the Study:

• To validate two novel methods for measuring lower limb and shoulder joint loads using instrumented crutches.
• To provide an accessible and cost-effective alternative to traditional gait analysis systems.

Main Methods:

• Instrumented crutches were used to measure ground reaction forces, eliminating the need for external motion capture or force plates.
• Lower limb load was calculated by subtracting crutch forces from total body weight.
• Shoulder joint reactions were estimated using linear regression models.

Main Results:

• The crutch-based method accurately estimated partial weight-bearing loads, particularly at lower walking cadences.
• Force estimations for shoulder joint reactions were accurate, though torque estimations showed less precision.
• The system demonstrated real-time data acquisition and processing capabilities, suitable for outdoor use.

Conclusions:

• Instrumented crutches provide a viable and accessible method for assessing lower limb and shoulder joint loading during walking.
• This technology can enhance patient monitoring for partial weight-bearing and shoulder joint issues, potentially improving outcomes.
• The system's real-time feedback and outdoor capability offer significant advantages for clinical and research applications.