im concerned

Question
what to do if my leopard gecko breaks its leg

Answer
Hi Donnie, A serious injury of that nature really should be seen by a vet. There may be resulting nerve, blood vessel or tissue damage  from a broken bone that the vet will address as well as managing the pain. There is the possibility of other injuries as well if the break was the result of a trauma like a fall.
Reptile bones can also become soft and easily broken or bent if their diet has been lacking calcium and vitamin D3. Make sure you are dusting your crickets regularly to avoid or correct this type of deficiency.