Stairs and steep slopes have been painful since the crash as the knee joint plays an important part in both movements. It is usually worse going downwards than upwards, however, I can manage a normal flight of house or office stairs without much trouble now.
Jacobs Ladder consists of 274 stone steps that run from the bottom of the Gorge to the top, each step represents 1 million years into the Earth's past. They say that at this scale, mankind's existence is equivalent to the thickness of a sheet of paper on the top step!
The picture below shows 46 steps between two resting points.
At the top we walked a little of the Gorge trail, but the land underfoot was very uneven and tiring to walk over. Coming back was even worse and my knee rapidly grew more painful. By the time we reached the bottom we were glad of a sit-down!