Black Diamond Trail Ergo Cork I just received my Black Diamond Trail Ergo Cork trekking poles, and I am excited to try them out soon. I have never been a user of trekking poles in my younger years, but I recently decided to give them a try since I recently had a totally left hip replacement, and I am looking forward to having the right hip done also in the near future. The new hip feels great, but I thought the poles could offer me some added stability as well as help reduce some wear and tear on the knees and hips. I will report back when I get some more experience with this new set.