I hope you have recovered well over the last few months, in January 2020 I also had surgery for a hemipelvectomy due to osteosarcoma. If you're still looking to connect with others that have had this surgery, go to the Amputee Coalition website and join AC Connect, it's an active forum / support area similar to this site. Once you've joined, you can add your amputation type on your page and network with others who have had the same surgery. There's currently 345 of us on there. There are also groups on Facebook for rare hemi's and hip disarticulations.