Upper extremity inverse dynamics model for crutch-assisted gait assessment

Area of Science:

• Biomechanics
• Pediatric Gait Analysis
• Assistive Device Dynamics

Background:

• Existing inverse dynamics models inadequately capture Lofstrand crutch-assisted upper extremity (UE) gait.
• Accurate quantification of UE biomechanics is crucial for understanding and improving gait in pediatric populations using crutches.

Purpose of the Study:

• To develop and validate a novel 3D dynamic model for assessing UE motion and forces during Lofstrand crutch-assisted gait in children.
• To quantify joint motions, forces, and moments in the thorax, shoulders, elbows, and wrists during crutch-assisted ambulation.

Main Methods:

• A novel 3D dynamic model incorporating the upper body and Lofstrand crutches was created.
• The model was applied to a pediatric subject with myelomeningocele (MM) to analyze reciprocal and swing-through gait patterns.
• Quantification of joint motions, forces, and moments was performed.

Main Results:

• The 3D model successfully quantified upper extremity dynamics during Lofstrand crutch-assisted gait.
• Greater joint motions and forces were observed during swing-through gait compared to reciprocal gait.
• The model demonstrated effectiveness in characterizing different crutch gait patterns.

Conclusions:

• The developed 3D dynamic model is suitable for analyzing pediatric Lofstrand crutch-assisted gait.
• Findings provide insights into the biomechanics of crutch-assisted ambulation, potentially informing clinical interventions.
• This research can enhance therapeutic planning for pediatric crutch users.