A technical modification of Cloward's posterior lumbar interbody fusion.

The concept of interbody (intercorporal) fusion as a useful treatment for intervertebral disc disease in the cervical area has been well received. Thirty-two years have passed since Cloward first introduced his technique of posterior lumbar intervertebral fusion. The author believes that the delayed acceptance of this procedure is due to fear of technical difficulties. A technical modification of Cloward's posterior lumbar interbody fusion is introduced. It entails better technique in controlling epidural bleeding by careful positioning of the patient and the use of oxidized cellulose as a tampon in the epidural space. The integrity of the facet is preserved through a more limited interlaminal approach. Osteosynthesis of the grafts is assured by multiple perforations of the cortical plate in accordance with Robinson's principle utilized in cervical interbody fusion. The author believes that the modification simplifies the Cloward posterior lumbar interbody fusion. It also assures better stability after surgery by retention of the facet and lessening the dangers of settlement of the graft by preservation of the cortical plate. In a series of 75 cases, tomograms made 4 months after operation have shown a viable graft with active osteosynthesis between the graft and the adjoining vertebral bodies in 94%.