Surgical reduction of spondylolisthesis using a posterior approach.

In 26 cases, spondylolisthesis was reduced and stabilized by an intervertebral graft in a new one-step surgical procedure. A critical review of various techniques presently in use illustrates the evolution of the one-stage operation. A most recent modification of the operation is open reduction and internal fixation by a combination of Harrington instrumentation and the posterior intervertebral arthrodesis of Cloward.