Lawyer Giles Corbin suffered multiple injuries when the jet ski he was a passenger on was involved in a collision with a speedboat.
The boat’s 36-year-old driver was later arrested on suspicion of reckless driving.
Mr Corbin, a partner at Mourant Ozannes, was airlifted to Southampton Hospital before being transferred to a specialist unit at Salisbury Hospital days later.
In Facebook posts, the 45-year-old has described how he has undergone operations to reconstruct bone, muscle and ligaments, as well as skin grafts.
In the latest post he said: ‘Had a brilliant night of sleep. Feeling on top of pain and more optimistic. Appetite returning. Thanks for all your thoughts and prayers.’