<s>[INST] I have a leg in aircast (walking boot) for 13 days and a few started to stick my shins hurt when getting up from bed. The pain is similar to the contraction of the calf. Only occurs when standing up for a while. Like a muscle strain. I can not see the calf swelling. Aircast strip off the shower and I use wheels. To date, very little went and held his leg up. I get fragmin injection every day. I am 20 years old and 75 kg [/INST] Hello, It looks that you are in recovery phase. You asked about Frag min injection for muscle strain. The frag min injection contain an anticoagulant agent known as delteparin. This is given as prophylaxis for ischemia or to dissolve clots in upper or lower limbs. For muscle strain it is of no use. Keeping your limb in position of rest with good analgesic is sufficient to treat muscle strain. Hope I have answered your question. Let me know if I can assist you further.  </s>