Employee injured his lower back while lifting a heavy aluminum platform with co-workers. Previously, Employee injured his lower back and underwent back surgery while working for the same employer. Employee received conservative medical treatment for his second back injury. Employee’s medical expert opined that he suffered a permanent exacerbation of his prior underlying back condition and, as a result, was permanently and totally disabled from all work including light, sedentary work. Claim settled prior to a Hearing for permanent and total workers compensation benefits under MGL c. 152, §34A with liability accepted for disc bulges at L3-4 and L4-5, chronic low back pain, exacerbation of prior work-related low back injury status post- surgery.