What does ATR stand for?

He played for Cannes and then Bordeaux before heading to East London in 2007 - but an Achilles tendon rupture kept him sidelined shortly afterwards and he has not featured this season.

An Achilles tendon rupture can happen suddenly and may be linked to weak calf muscles.

But he missed their win over Catalans Dragons at the new Wembley a year ago with an Achilles tendon rupture and, after failing to appear in any of the four rounds of the cup so far this year because of various injuries, was in serious doubt for Saturday's duel with Hull.

By and large, tendons may be injured in one of three ways: Acute trauma, which is a sudden event that causes serious damage to a previously normal tendon; chronic overuse injury, which amounts to cumulative damage from repetitive, micro-tear-causing stress that compromises the ability of a tendon to withstand tension; and sudden trauma brought on by repetitive overuse, as in an Achilles tendon rupture, which most often shows evidence of lesser injury prior to the rupture.

But having suffered an Achilles tendon rupture myself, I know how long it can take to come back from it.

Kelly was favourite to take World Championship 1500 metre gold in Athens in 1997 but collapsed in tears with an Achilles tendon rupture and calf muscle tear.

Primary or secondary Achilles tendon rupture is often felt as a "pop" during eccentric loading sports activities.

Flexor Hallucis Longus (FHL) tendon transfers are commonly used in the repair of chronic Achilles tendon ruptures.