Hi Colin, I am an osteopath in Australia and have trained in pilates as well. One recommendation I would have would be to do something like a supine bridge where you focus on putting equal pressure through both heels as you push your hips up. The aim is to retrain your body to use the left side because often after a significant injury we can develop compensatory movement patterns that continue after the injury has healed. By focusing using the left as well your body starts to relearn to weight-bear evenly through activity.
It isn’t always purely about strengthening and is often more about reactivating certain muscles after an injury. Hope this helps