Dear Cherry Red:
I have scoliosis also. I am not a physical therapist, but a long time yoga practitioner with a similar issue.
sivananda leg raise series loosens lumbar spine and hamstring and connection areas; sivananda uses repetition, breath and a meditative approach to movements. It is a mental coaxing, settling-in approach to loosening up the body. It helps balance muscles, as well.
What I have found with my scoliosis is, it is important to develop balance with developing muscles along the spine more than it is initially to develop strength.
Since this might be the case with your scoliosis, too, I have added descriptions of sivananda leg raise series, with variations that have worked for me.
start by lying on the floor with an out breath, breathe in and raise one straight leg in time with your breath. lower in time with your out breath. Do this two more times, then on the third repetition, snug your leg with your hands toward your body for five breaths (you can use a strap to reach around your leg) . If this is uncomfortable on your back, bend the extended leg on the floor so the sole of your foot is on the floor. HOld this position for at least five breaths and repeat three times. Each time you will find the muscles loosening a bit more. Consciously coordinating the breath with these movements creates a system-wide relaxation response.
Next, raise your bent knee with in breath, lower with breath out three times. The third time, hold the knee to your chest for five breaths. I like to circle the knee around to loosen the hip area here. On the next bent leg raise, raise your bended knee and then also bend your second leg and cross your first bent leg ankle across the second bent knee (a hip opener pose). Reach your hands behind that knee bringing it gently toward your chest. If you have to hunch your shoulders toward your ears or pull your shoulder blades off of the floor to do this, use a strap around the bent leg that is behind the ankle. Hold for at least five breaths. finish off the third bent leg raise repetition with restorative twists, right knee across left leg keeping right shoulder on the floor. Hold for at least five breaths.
We each are on our own separate journeys to help create balance, harmony and union between our bodies and our minds with our yoga practices.
I wish you success on your journey !