Becker muscular dystrophy (BMD) is one of the nine types of muscular dystrophies, characterized by degeneration of the voluntary muscles. In its features, BMD is very similar to Duchenne muscular dystrophy, but has a much reduced severity, later age of onset, and slower rate of progression. Typical features of the disease include delayed gross motor milestones, proximal muscle weakness, and increased number of falls in early life. Later on, elbow contractures, and significant heart involvement may be noticed.
Laboratory results that aid in diagnosis of BMD include moderate to severe elevation of serum creatine kinase, mutations in the Dystrophin gene, and the presence of variable percentages of dystrophin in muscle biopsy specimens. The progression of the disease is very slow. However, there is no cure for BMD. Management relies mostly on physical, occupational, and even speech therapy. Females are very rarely affected.