This investigation presents the findings in 105 patients after disc operations who required renewed in-patient treatment mainly because of their resistance to therapy and/or recurrence of the lumbar syndrome. A number of factors were found to be implicated in providing a reason for unsatisfactory results after operations for prolapsed lumbar intervertebral discs. It must be postulated that interfering factors like ligamental pain, restricted movement, participation of the hip, psychological aspects, polyneuropathics and focal occurrence have to be taken into consideration already preoperatively in the diagnosis, indication for operation and therapy. Also with post-operative complaints special alteration must be paid during rehabilitation to those factors quoted above, as well as to direct post-operative complications like inflammation and scar.