Final answer:
A grade 2 ankle sprain may be treated with a flexible splint or brace, while a grade 3 sprain may require a rigid cast. Initial treatment includes the RICE technique, and in severe cases, surgery may be necessary.
Step-by-step explanation:
The type of splint used for a grade 2 or grade 3 ankle sprain typically involves immobilization with a brace or cast. For grade 2 sprains, which indicate a partial tear of the ligament, a more flexible splint or brace that allows for some movement may be recommended after the initial swelling has decreased. For grade 3 sprains, representing a complete tear of ligaments, a more rigid cast might be necessary to ensure that the ankle stays immobilized, providing the ligaments the best chance to heal properly.
Treatment often begins with the RICE technique: Rest, Ice, Compression, and Elevation to manage pain and swelling. Reducing joint mobility helps with the healing process. However, more severe sprains may require advanced treatments, such as surgery, especially if there are associated ligament tears or fractures.