If surgery is required then 23 year-old Henson will miss Wales's Autumn International series plus their RBS Six Nations campaign as well as the majority of the domestic season with the Ospreys.
The British Lion has flown to the renowned Hans Muller-Woolfhart clinic in Germany for a diagnosis and will discover his fate when he joins up with his region for training in France next week.
The Ospreys star was at the centre of his region's Celtic League triumph and Wales's Grand Slam-winning side last season despite playing for most of it while receiving a prolonged course of anti-inflammatory injections.
The news comes as a bitter blow to Henson following an indifferent tour to New Zealand during which he suffered heartache when left out of the Lions' line-up for the first test against the All Blacks.
Ospreys Team Manager Derwyn Jones has played down the significance of Henson's visit to Germany saying: "Gavin has got a groin problem. He is just going to get it checked out."
Wales U20 captain Tom Phillips and performance psychologist Dr Rich Neil explain why spending three days at Monmouth RFC has further strengthened the togetherness of the squad ahead of the #WorldRugbyU20s
Alongside Scarlets flanker James Davies and Cardiff Blues centre Cory Allen, three Wales Sevens core players have made the extended training squad for GB Sevens. Wales Head coach Gareth Williams tells WRU TV's Graeme Gillespie why Luke Treharne, Sam Cross and Luke Morgan earned selection in the initial training squad for Rio.
Wales Sevens head coach Gareth Williams tells WRU TV's Graeme Gillespie he has had to overcome a number of injuries before naming a competitive squad for this weekend's penultimate round of the World Series in Paris.
Merthyr were officially crowned champions of the SSE SWALEC Championship at Dowlais on Saturday where captain Andy Powell paid tribute to his side who have earned promotion to the Principality Premiership
Coleg y Cymoedd's season has had a spectacular ending with victory in two cup finals and a massive victory over one of the best rugby playing schools in the world - Welsh coach Warren Gatland's old alma mater, Hamilton Boys' High School.
WRU chief executive Martyn Phillips hosted the second meeting of the WRU Youth Board last weekend ahead of the Judgement Day IV regional double-header. Tthe board, made up of 15 under-21-year-olds from around Wales, heard presentations from head of participation Ryan Jones, policy and integrity manager Jeremy Rogers and national women's rugby manager Caroline Spanton, with Pro Rugby Wales CEO Mark Davies also on hand to hear the range of views aired.
Wales duo Rhun Williams and Liam Belcher, who makes a welcome return after five months of injury woe, look ahead to next month's World Rugby U20 Championship in Manchester where they will face Ireland, Georgia and New Zealand.