When moving mesquite branches a branch swung against my kneecap and the thorn broke off. I was not able to get it out. The next morning, a Sunday I could not bend my leg. I soaked in epsom salts 30 minutes & then was ok. A day or so later apparently it worked it s way further in & I could no longer see it. 2 weeks later my upper thigh is hurting & my husband suggested maybe there is a connection. I have been using an ointment said to pull thorns out of cattle hoofs & 1 week later there is a little bump in the puncture place.