What are the signs and symptoms of a Grade 1 strain?

A Grade 1 strain is characterized primarily by mild damage to the muscle or tendon fibers, typically referred to as a "mild strain." The signs and symptoms indicate that while there is discomfort, the ability to perform active range of motion remains intact and falls within normal limits. Specifically, individuals may experience pain with movement but are still able to use the affected muscle without significant limitation.

Other associated symptoms might include mild swelling and tenderness in the area, but these do not significantly restrict movement. This is why the recognition of pain during active movement is a core indicator for a Grade 1 strain.

In contrast, the other options suggest more severe conditions. Significant joint instability and bruising are indicative of higher-grade strains or even complete tears. Complete loss of function and severe pain would point towards a Grade 3 strain, where there is complete rupture of the tendon or muscle, often accompanied by substantial swelling and bruising. Mild swelling and bruising, while applicable, do not represent the range of motion aspect that distinguishes a Grade 1 strain; it focuses more on the visible signs of injury rather than the functional capacity.