The Study
Moment arms of the muscles crossing the anatomical shoulder
This study looked at 8 dead bodies to measure how different parts of shoulder muscles help move the arm. It tells us what these muscles can do mechanically, but not how they actually work in living people.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
Scientists used dead bodies to test which parts of shoulder muscles help lift or lower the arm. They looked at small parts of big muscles to see how each helps move the arm.
Where does this study sit?
Systematic Reviews & Meta-analyses
Max 100Randomized Trials
Max 90Cohort Studies
Max 72Case-Control
Max 58Cross-Sectional
Max 44Case Reports & Series
Max 30Expert Opinion
Max 54 / 100
Quality score
Detailed descriptions of individual patients or small groups. Valuable for identifying new conditions or side effects, but cannot establish generalizable conclusions.
Key takeaways
Summary
Based on the study abstract and findings.
- 1This helps doctors understand shoulder injuries better and could improve surgeries or robot arms in computers.
- 2The front and middle parts of the deltoid muscle help lift the arm sideways.
- 3The top part of the chest muscle helps lift the arm forward.
- 4Other parts of muscles help pull the arm down or keep it steady.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Journal of Anatomy
Year
2008
Authors
D. Ackland, P. Pak, M. Richardson, M. Pandy
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.