Five weeks after L4 nerve root avulsion with preconditioning crush 1 week prior to avulsion, the expression of 27 kDa heat shock protein is stronger than that in the avulsion-only group.

Methods A total of 116 patients referred with symptoms of ... % CI 1.06–37.21) for L4, 1.74 (95% CI 1.04–2.93) for L5, and 1.29 (95% CI 0.97–1.72) for S1 nerve root impingement.