What is GIRD and why does it matter?

GIRD (Glenohumeral Internal Rotation Deficit) is a side-to-side internal rotation difference >18-20 degrees in the dominant arm of throwers. Associated with SLAP tears, posterior capsule contracture, and shoulder pain.

How does shoulder IR range affect velocity?

Adequate total arc of rotation (IR + ER) of 180 degrees or more allows full arm acceleration. Restricted IR with compensatory ER increase alters humeral head position and can reduce velocity while increasing injury risk.

Shoulder Internal Rotation Range and Pitch Velocity Calculator

Correlate shoulder internal rotation range of motion with pitching velocity. Assess GIRD (glenohumeral internal rotation deficit) risk: >18-20 degree side-to-side asymmetry.

Core Tools

Distance covered in 12 minutes (meters)

🏅 Sports Note: These calculators provide estimates based on population data and validated formulas. Individual results vary by physiology, training level, and testing conditions. Consult a qualified coach or sports scientist for personalized guidance.

How to Use

Enter the values for the scenario you are assessing. Correlate shoulder internal rotation range of motion with pitching velocity. Assess GIRD (glenohumeral internal rotation deficit) risk: >18-20 degree side-to-side asymmetry. Use the shoulder ir velocity result to inform your calculation.

Related Calculators

Trunk Rotation Velocity

Specialist Sports & Biomechanics

Elbow Valgus Torque

Specialist Sports & Biomechanics

Wrist Snap Velocity

Specialist Sports & Biomechanics

Shoulder Internal Rotation Range and Pitch Velocity Calculator

How to Use

Related Calculators

Frequently Asked Questions

What is GIRD and why does it matter?

How does shoulder IR range affect velocity?