Predicting longitudinal changes in joint contact forces in a juvenile population: scaled generic versus...

Area of Science:

• Biomechanics
• Musculoskeletal modeling
• Pediatric orthopedics

Background:

• Subject-specific musculoskeletal models are crucial for analyzing joint loading but are hindered by time, effort, and imaging requirements.
• Clinical application of detailed musculoskeletal models is limited, necessitating simpler, more accessible alternatives.

Purpose of the Study:

• To evaluate the consistency of longitudinal joint contact force (JCF) estimations between scaled generic and subject-specific musculoskeletal models in children.
• To determine if scaled generic models can accurately detect changes in JCF over time, comparable to subject-specific models.

Main Methods:

• Collected joint kinematics and calculated JCF for 11 children using both subject-specific and scaled generic musculoskeletal models.
• Compared the longitudinal changes in JCF estimated by the two modeling approaches for the hip and knee joints.

Main Results:

• Strong correlations were observed in estimated JCF changes between scaled generic and subject-specific models for the hip and knee.
• While JCF estimates varied between the two model types, the trends in changes were consistent.

Conclusions:

• Scaled generic musculoskeletal models demonstrate sufficient sensitivity to detect longitudinal JCF changes in children, mirroring findings from subject-specific models.
• These findings suggest that scaled generic models offer a viable, less burdensome alternative for clinical assessment of joint loading changes in pediatric populations, within acceptable accuracy limits.