Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) tibial muscular dystrophy ?
    ### Response:
    Tibial muscular dystrophy is a condition that affects the muscles at the front of the lower leg. The signs and symptoms of this condition typically appear after age 35. The first sign is usually weakness and wasting (atrophy) of a muscle in the lower leg called the tibialis anterior.
    