444 days missed since October 2015 until now, given this latest injury by the time he returns he will have spent more time injured than fit over the last 4 years, at his age, it doesn't bode well, neither does one part seemingly being a weak spot, 3 injuries on it, the last being surgery to fix it - less than four months after that he cracks his ankle, much like with hamstrings, when your ankles start going like that, it'll hamper him his whole career.
Yakubu was finished by that problem, can argue baines rapid decline coincided with his ankle injuries too, not to mention ones longer back than that whose careers got derailed by that issue.