In a 2014 Case Report, researchers treated A 9-year-old boy who had a history of difficulty in getting up from the floor, climbing stairs, and frequent falls since the age of 4 years. The increasing weakness in the lower limbs led to toe walking and loss of ambulation by the age of 8 years. The weakness then progressed to the upper extremities and performing overhead activities was difficult. Diagnosis of DMD was confirmed based on the clinical features, elevated serum creatinine phosphokinase (CPK) levels (5460 IU/L), and genetic analysis with multiplex polymerase chain reaction for dystrophin gene showing deletion of exons 51 and 52.