Team vehicles were mobilised to the track end at Greenfield Brook.
The team then made their way up the steep slope to the Trinnacle, carrying all the necessary equipment to deal with the incident.
Their neighbouring team, Holme Valley Mountain Rescue, were called to assist.
On locating the casualty, the OMRT medical technician assessed the ankle injury before applying a vacuum splint to make it more comfortable.
Due to the location, injury and temperature the team requested assistance from the Coastguard to extricate the casualty from the hillside.
Unfortunately, despite their best efforts, the crew were unable to reach the scene, hampered by low clouds across the Pennines.
This meant a long stretcher carry off.
It was dark by the time the stretcher team reached the waiting North West Ambulance Service at the reservoir track.
There was a quick handover to the crew before the ambulance made its way to hospital.
Twelve Oldham Mountain Rescue Team members, 10 Holme Valley Mountain Rescue Team members and one Woodhead Mountain Rescue Team member were involved for four hours.
