Ankle Mobility Deficit Calculator

How to calculate Ankle Mobility Deficit?

The deficit is calculated by comparing measured dorsiflexion against the clinical baseline of 20 degrees.

Formula: Deficit % = ((20° - Measured°) / 20°) × 100

Using the mobility calculator: an example

Example: An athlete measures 12° of dorsiflexion.

Step-by-step calculation:

1. Identify the 8° gap from the 20° norm
2. Divide the gap by the norm (8/20 = 0.4)
3. Multiply by 100 to get a 40% mobility deficit

Frequently Asked Questions

Why does ankle mobility affect gait?

Limited dorsiflexion forces the body to compensate, often leading to over-pronation or early heel-lift during walking.

How does this relate to injury risk?

Reduced mobility is a primary risk factor for plantar fasciitis, Achilles tendonitis, and knee instability.

Can mobility be improved?

Yes, targeted stretching and joint mobilization exercises can often restore the range of motion over time.