My condition has improved. Pain persists, but I can walk without a gait, now. My feet still have to shuffle a bit, though. Last night was torturous. Unlike previous back mishaps, no possible position offered refuge. It felt refreshing to be under relentless discomfort.
Did some shadowboxing today. It was completely arm-punching, as I couldn't bend or twist my torso. I also did sissy squats, which entail squatting on tip-toes to isolate the quadriceps. Those were feasible because they lack any degree of leaning back.
I expect to resume next week where I left off, but this time, I plan on getting to the gym bright and early to ensure that it's empty, and doing deadlifts next to the mirror in the cycle room to evaluate my form.