Hi Rob – this looks like bad news.
On the other hand, we now know the stem is cemented (and we need someone on here with a cemented stem to join the conversation) and the bearing is the expected plastic on ceramic, like most hiprunners I suspect. Your surgeon suggests the device is not designed to take large axial loads but I found a testing site that quotes stem fatigue tests at 517 pounds/5 million cycles and neck fatigue loads of 1200 pounds/10 million cycles as standard. For me, those figures equate to 3.5g and over 8g shocks respectively, ten million cycles could be 10,000 km or 6,000 miles or more. I have a very gentle running style, low shock loads, and I only have another 10 years or so of running left so I am happy to continue to test my devices. I am a little worried by your cemented stem and you have to worry about revisions in your future and I don’t know your weight/running style – but I would still encourage you to give it a go when you feel ready, if it does not feel right at least you will have tried…
Good luck
Pete