I think 2011/12 was his best season. His injury record is a bit better than Owens though, over his Arsenal career he's managed to average 26 starts per season. Got this from an Arsenal blog
2004-05: Debut season cut short by and ankle injury in February after also spending time out with two sprained ankles (not at the same time).
2005-06: Suffered a knee injury, and two more ankle injuries. Arsenal fans are starting to realise why the Dutch fans refer to him as ‘glass ankles.’
2006-07: Just to mix things up a bit Robin suffered a hip injury followed by a metatarsal fracture then another knee injury before suffering a thigh muscle strain.
2007-08: Managed to make it January before injury set in and then suffered three thigh muscle strains in quick succession.
2008-09: An ankle injury started the season off followed by a hamstring injury and a couple of groin strains to end the season.
2009-10: A knee injury arrived in September followed by a sprained ankle. This was the season he tried to use horse placenta to cure what turned out to be torn ligaments and missed five months of the campaign only to return in April to feature in the last few games.
2010-11: Another early ankle injury suffered in August kept him out until November. He caught flu in February as well as pulling a hamstring and then injuring his knee.
2011-2012: Robin’s most injury-free season since he signed for Arsenal, he picked up the obligatory ankle injury in August then had an injury free run until he picked up a little groin strain in February.
I think United are recruiting extra staff for the sick bay