An anterior talofibular ligament (ATFL) rupture can be classified according to the severity of the injury, as follows:
- Grade I: Mild sprain with minimal or no ligament fiber tear. This type of injury usually causes mild swelling and pain, but the patient can still walk normally.
- Grade II: Moderate sprain with partial ligament fiber tear. This type of injury causes moderate swelling, pain, and instability of the ankle joint. The patient may experience difficulty walking and may need crutches or a brace to support the ankle.
- Grade III: Severe sprain with complete ligament tear. This type of injury causes severe swelling, pain, and instability of the ankle joint. The patient is usually unable to bear weight on the affected ankle and may require surgery to repair the torn ligament.
It is important to note that the severity of the injury does not always correlate with the level of pain or disability experienced by the patient. In some cases, even a mild sprain can cause significant pain and disability, while in other cases, a severe sprain may cause little pain or disability.