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No Relationship Between Hamstring Flexibility and Hamstring Injuries in Male Amateur Soccer Players: A Prospective Study.
van Doormaal, Mitchell C.M. PT, MSc; van der Horst, Nick PT, MSc; Backx, Frank J.G. MD, PhD; Smits, Dirk-Wouter PT, PhD; Huisstede, Bionka M.A. PT, PhD
[Article] American Journal of Sports Medicine. 45(1):121-126, January 2017.

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Background: In soccer, although hamstring flexibility is thought to play a major role in preventing hamstring injuries, the relationship between hamstring flexibility and hamstring injuries remains unclear.

Purpose: To investigate the relationship between hamstring flexibility and hamstring injuries in male amateur soccer players.

Study Design: Case-control study; Level of evidence, 3.

Methods: This study included 450 male first-class amateur soccer players (mean age, 24.5 years). Hamstring flexibility was measured by performing the sit-and-reach test (SRT). The relationship between hamstring flexibility and the occurrence of hamstring injuries in the following year, while adjusting for the possible confounding effects of age and previous hamstring injuries, was determined with a multivariate logistic regression analysis.

Results: Of the 450 soccer players, 21.8% reported a hamstring injury in the previous year. The mean ( /-SD) baseline score for the SRT was 21.2 /- 9.2 cm. During the 1-year follow-up period, 23 participants (5.1%) suffered a hamstring injury. In the multivariate analysis, while adjusting for age and previous injuries, no significant relationship was found between hamstring flexibility and hamstring injuries (P = .493).

Conclusion: In this group of soccer players, hamstring flexibility (measured with the SRT) was not related to hamstring injuries. Age and previous hamstring injuries as possible confounders did not appear to influence this relationship. Other etiological factors need to be examined to further elucidate the mechanism of hamstring injuries.