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Related Experiment Video

Updated: Jun 24, 2026

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion

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Published on: April 11, 2018

A comparison between two models of shoulder muscle force estimation.

Daniel Cury Ribeiro¹, Joelly Mahnic de Toledo, Roberto Costa Krug

¹Physical Education, Federal University of Rio Grande do Sul, Porto Alegre City, RS, Brazil.

Journal of Applied Biomechanics

|March 21, 2009

Summary

Comparing two shoulder muscle force estimation models revealed varying reliability. Algorithm structure significantly impacts results for muscles like the latissimus dorsi, teres major, and middle deltoid.

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Area of Science:

Biomechanics
Musculoskeletal modeling

Background:

Shoulder injuries frequently involve rotator cuff muscles.
Accurate muscle force estimation is crucial but challenging.
Existing models for muscle force estimation vary in reliability.

Purpose of the Study:

To compare the reliability of two distinct muscle force estimation models.
To evaluate the agreement between models for shoulder rotator muscles.

Main Methods:

Eight healthy subjects (7 male, 1 female) performed isokinetic shoulder rotations.
Two models with different algorithms were used for muscle force estimation.
Input data included measured internal rotation moment.

Main Results:

Reasonable agreement was found for subscapularis, pectoralis major, and anterior deltoid forces.
Poor correlation was observed for latissimus dorsi, teres major, and middle deltoid forces.
Model algorithm structure significantly influenced estimation outcomes.

Conclusions:

The choice of algorithm in muscle force estimation models impacts reliability.
Further research is needed to refine models for complex shoulder musculature.