Injury to the hamstring origin usually occurs when sudden forcible contraction of the hamstring muscles against resistance causes excessive eccentric overload, as in sporting activities such as gymnastics and sprinting (Gidwani and Bircher, 2007). Hamstring origin injuries are rare when considered alongside mid-substance hamstring muscle tears (Kujala et al 1997). Hamstring strains most often occur in the biceps femoris and the most common location is near the musculotendinous junction (Armfield et al 2006).
