If you have leg pain
then you have to rule out the casues for having leg pain. First of all check your weight and your haemoglobin levels, as Anaemia always leads to the symptoms of being tired and also having leg pain though there are no issues with the knee joint or back pain
. Since you met with an accident probably you would've had blood loss and also you must be having mineral or calcium deficiency that is one reason to feel very rigid or stiff in that area. Hot water fermentation that would help to reduce the muscle strain. Keep ice in the area where you have pain/or where the muscle is injured.