Table 1.

Ankle sprain grading system (Beynnon et al., 2006).

Clinical grade	Description of grade level
Grade I (Mild)	Minimal swelling(edema) and tenderness; minimal or no function loss; no mechanical joint instability
Grade II (Moderate)	Moderate pain, swelling, and tenderness over involved structures; some loss of joint motion; joint stability is mild to moderately impaired
Grade III (Severe)	Complete ligament rupture with evident swelling, hemorrhage, and tenderness over involved structures; function lost; joint motion and instability evident as abnormal