I have an old friend that had both hips replaced a year ago (or more?) and he´s easily beating me in orienteering.
The softer ground and constant adjustment of movement in the terrain I would say is much better for a replaced body part (knee/hip) than the monotonous beating when running on hard ground. I think the latter is what doctors have in mind when they say 'no running'.
Yes Lief, my surgeon is being very conservative in his assessment of running. He is also considering my age, although my bone density is fine.
I am going to wait for the spring and a full recovery before I consider runnng, and only on soft surfaces,
The new hip does not have any cushening properties like my old cartellege-based one. So there is more impact directly on the prosthesis parts and bone. A strong surrounding muscle group can compensate somewhat for that.
So I will test it all out in April and review my progress with my medical team.
Good luck with your rehab!