hi christine,
well for ur l-4,l-5 case i think i have gota light for u since even i was goin through the same problem which u facing for one of my patients.i came to know certian points which i m sharing wid u
1. never use tens and ultrasound therapy together in same place as it can increase the pain
2. bets was is use swd in the lower back tens one head placed in l4 region another in calf muscle of patient.
3. try giving int. lumbar traction as it will reduce the radiating pain for ur patinet
i have done all these and cam out as a happy man
gud luck honey