Jackson and Feagin grading of muscle contusion

Mild active or passive range of motion limited to less than 1/3 of normal. 6 days of disability.
Moderate active motion limited to 1/3 to 2/3 of normal range due to muscle spasms. 56 days of disability
Severeactive motion limited to more than 2/3 of normal range of motion. More than 60 days of disability