Grade 
Symptoms 
Signs 
Stability 
Anatomy
1 Pain 0-2
Swelling 0-2
Edema 0-2
Tenderness 0-2
FunctionLoss 0-2
Stable <20% fibers torninternal micro damage with full continuity
2 Pain 3
Swelling 3
Disability 3
Edema 3
Tenderness 3
Function Loss 3
Ecchymosis 40-50%
Unstable + Solid Endpoint 20-70% fibers tornmechanical dissociation with partial loss of continuity
3 Pain 4
Swelling 4
Disability 4
Edema 4
Tenderness 4
Function Loss 4
Ecchymosis  70-90%
Unstable + No/Mushy EndPoint >70% fibers tornTotal Rupture

 

     Classification of sprains/strains0-4 Scale: 0 = absent,  1= minimal,  2 = mild,  3 = moderate,  4 = severe
From Birrer RB:  Ankle Injuries.  In Birrer RB, ed, Sports medicine for the primary care physician, ed 2 Boca Raton, Fla, CRC, p 310