// multi-utility computation suite · offline · instant · precise
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health.shoulder-rotator-cuff-force Calculator
Calculates the rotator cuff and deltoid muscle forces required to stabilise the glenohumeral joint during arm elevation using static equilibrium. Supraspinatus generates 50% of abduction torque below 60° of elevation — its line of action compresses rather than shears the joint.
Inputs
Deltoid Force N
Push or pull (N). F = ma. Net force determines acceleration. Account for all forces including gravity and friction.
Abduction Angle Deg
Reference formula or conversion factor shown for context.
Arm Mass Kg
Total mass (kg). Distinct from weight — weight = mass × gravity. Mass is constant; weight varies with location.
Results
rotator cuff compressive force (N)
The value at the specified point or condition.
deltoid force (N)
Sample size or count used in the calculation.
arm weight component (N)
The computed weight (gravitational force) or mass.
glenohumeral reaction force
The force exerted by a support on a structure. Equal and opposite to the applied load at that point (Newton's Third Law).
clinical note
Supplementary information explaining an assumption, caveat, or important context for interpreting the result.
impingement risk
Overall risk level based on the computed score or classification. Higher risk may call for mitigating actions or additional review.