Investigator investigated that regression of hamstring flexibility and performance in children with Duchenne Muscular Dystrophy.

Flexibility of hamstrings was evaluated by Popliteal Angle test. Performance was evaluated 6 Minute Walk Test (6 MWT). Regression of hamstring flexibility and performance was examined regression tests. Correlation was examined between popliteal angle test and parameter of North Star Ambulation Assessment.

Inclusion Criteria:

• To be a Duchenne Muscular Dystrophy diagnosis,
• Being in the ambulatory period and climbing four steps independently,
• to be Level 1 and Level 2 according to Brooke Lower Functional Classification Test
• To be able to cooperate
• No any severe contracture in the lower limbs which may prevent assessments,

Exclusion Criteria:

• Children who fail to meet these criteria study.

Sixty children will participated this study. Fourty-two children was assessed, and eighteen children will assess in a few months.