Academics and medics are working to understand why hamstring injuries are keeping players sidelined for longer

The sight of a player pulling up with a hamstring injury has become all too familiar in the Premier League. Weary muscles are being stretched to the limit by an expanding calendar, but dealing with more games is not the only challenge for medical departments.

It is not that there has been a sudden explosion. It can simply seem that way when high-profile players such as the Arsenal forwards Bukayo Saka and Kai Havertz are long-term absentees. Using figures up to and including game week 26, that ended last Sunday, the Premier Injuries website says 100 of the 418 injuries this season related to hamstrings (24%), compared with 120 from 457 (26%) at the same stage last year.