I'm getting increasingly unsettled by the 'tight hamstring' cry of many of the patients I see at the clinic. Why is it only hamstrings that get tight - I've rarely heard of someone complaining of tight biceps.
Hoskins et al. explain that hamstring injuries are the most common injury in running-based power sports. Conventional sports medicine‘s thinking is that poor flexibility, fatigue, lack of warm-up and weakness are factors for injury – but there is no good scientific evidence to support this thinking.
Hoskins’s RCT took 59 adults from two Australian Rules football teams. One group continued to receive the typical gold standard care as directed by the club staff for the season. The other group received massage, as directed by the club staff, and chiropractic management, as directed by the chiropractor, with a minimum treatment schedule of one treatment per week for 6 weeks and 1 treatment per fortnight for 3 months then one treatment per month for the rest of the season.
Injury diagnosis was done by the club staff blind to which treatment has been received.
After 24 matches there was a significant difference in favour of those in the chiro group. There was also a significant difference in the number of weeks missed due to hamstring injury: 4 weeks total verses 14 in control, low limb muscle strain (4 vs 21), non-contact knee injury (1 vs 24).
Hoskins w Pollard H, Bonello r (2007) the effect of sports chiropractic on the prevention of athletic injuries in Elite athletes: a randomised controlled trail. Abstract in Proceedings of the WFC’s 9th Biennial Congress, 163-164
A start in the addressing of this testing condition, any thoughts or better yet, any better evidence?
C1CHC
Pro 
This is one I found on the web on a well regarded site: "Most athletes have insufficient flexibility and mobility in their hamstring muscles, which can dramatically increase the risk of problems. In addition, many individuals possess imbalances in the strengths of the flexors and extensors of their hips and knees. Add hamstring fatigue to the mix, and these 'weak links' can tighten, cramp, strain, or even tear the hamstrings at the drop of a hat. As Steve Jones once said, 'Every great athlete is only a hamstring away from oblivion'."
Can you see the muddled thinking there - 'insufficient flexibility and mobility in their hamstring muscles' ! I sort of know what they're saying but flexible muscles - surely its in their very nature to be flexible.
We've had a whole rush of sacroiliac joint complaints in the last week and nearly all have had terrible glut and hamstring muscles along with one full tear, but he was a semi=professional fotball player so far more likely to do himself and injury.