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Background and aim: With respect to attachment and mechanical relationship of hamstring and calf muscles, interaction between their function is unavoidable. Inspite of prevalence of hamstring and calf muscles shortness, there is not any statistical data about the relationship of shortness of above-mentioned muscles in Iran. The aim of this study was to verify of this prevalence.

Materials and methods: In this study 3308 healthy girls with age 3-17 years old participated. Length of calf muscles with dorsi flexion angle and hamstring with hip flexion angle (SLR) in both side were measured.

Results: The prevalence of hamstring and calf muscles shortness with together was20% in right and 25% in left side .The Prevalence of hamstring and calf muscles shortness with together in 20 district was greater than 3.The greatest amount was seen in secondary school(31.6%).               

Conclusion:The results indicated that most of subjects who had hamstring shortness, they had also calf muscles shortness, so if there is any shortness in one of them, we shouhd pay attention to shortness of the another.

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Background and Aim: One of the risk factors in sports injuries is inappropriate flexibility of muscles, which leads to pain, decrease range of motion and functional limitation in sport or daily activities and affects the athletes’ quality of life. The aim of this study was to investigate the relationship between flexibility of calf muscles and functional status of athletes with ankle injuries.
Materials and Methods: Thirty male athletes with ankle injuries (mean age ± SD, 22.63 ± 3.94 range: 18-40 years) participated in this study. Ankle dorsiflexion of affected and non-affected sides were measured with a goniometer. FAOS (Foot and Ankle Outcome Score) questionnaire was used to evaluate the functional status of ankle.
Results: The relationship between flexibility of calf muscles in the affected extremity, and total score of the functional questionnaire, was not statistically significant (P>0.05). While the relationship between the flexibility of muscles and functional questionnaire's total score in the non injured extremity was significant (P = 0.004, r = 0.51).
Conclusion: This study revealed that although the athletes who have more flexibility of calf muscles, show better functional status of ankle but there is not necessarily a relationship between inflexibility of the muscles and lowered functional status.