A woman in her 60s was airlifted to hospital after dislocating an artificial hip while on a day tramp in Greymouth's Victoria Forest Park.
The 66-year-old, her husband and two friends were hiking in the park when the incident occurred on the right branch of the Rahu River around 12pm on Friday.
The Murchison woman was taken to Greymouth Hospital by rescue chopper.
The trampers had been following the Klondyke Valley Track to the head of the valley and were climbing to link up with the Klondyke Spur Track when the incident occurred on steep, rocky terrain at an altitude of 1100 metres.
The woman's husband was forced to walk back to his car and drive to Springs Junction to contact emergency services.
She was picked up by the Greymouth-based New Zealand Coal & Carbon (NZCC) Rescue Helicopter shortly after 1 pm.
A St John Ambulance paramedic and helicopter crewman were able to hover and unload near the scene, a statement from the chopper crew said.
The woman was treated at the scene before being flown to hospital.