The 26-year-old Pole has been in hospital near Genoa, Italy, since he was seriously hurt in a crash while competing in a rally on 6 February.Dr Igor Rossello said: "The good news is there have been no complications following all the surgery he has had.
"He is doing pretty well and his condition is positive considering what he has been through."
Dr Rossello, who operated on Kubica's right hand, which was nearly severed in the crash, added: "What is very important is there is no sign of infection, which is the main concern, and he also no longer needs intensive care, so he has begun the rehabilitation process."
He added that Kubica, who finished eighth in the 2010 drivers' table, had regained "a little bit of sensitivity" in the hand and was able to slightly flex his fingers.
Kubica has undergone three operations since his car left the road in the Ronde di Andora.
In addition to the hand injury, he sustained multiple fractures to a leg and arm.
The medical team attending Kubica say he will spend at least two more weeks at the Santa Corona hospital in Petra Ligure, while he is recovering from the operations.
Kubica is expected to miss the entire 2011 season, although he told Gazzetta dello Sport last week that he was aiming to return to F1 before the end of the year.
Renault have since named his former BMW Sauber team-mate Nick Heidfeld as his stand-in.
"He [Kubica] is no longer in pain and his psychological condition is pretty good," added Rossello, in an interview on the Renault website.
"He's obviously keen to start the rehabilitation work as soon as possible. For the next couple of weeks he will stay here so we can monitor his condition.
"During that time there is still the possibility of infection and other complications, so he will have the dressings on his hand changed every few days."
Source: BBC Sport
