Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Ullrich congenital muscular dystrophy ?
    ### Response:
    Ullrich congenital muscular dystrophy is a condition that mainly affects skeletal muscles (the muscles used for movement). Affected individuals show severe muscle weakness soon after birth, develop stiff joints (contractures) in their knees and elbows, and may have an unusual range of movement (hypermobility) in their wrists and ankles.
    