Novel surgical technique for ossification of posterior longitudinal ligament in the thoracic spine.

Several surgical procedures have been developed to treat thoracic ossification of the posterior longitudinal ligament (OPLL). However, favorable surgical results are not always achieved, and consistent protocols and procedures for surgical treatment of thoracic OPLL have not been established. This technical note describes a novel technique to achieve anterior decompression via a single posterior approach. Three patients with a beak-type thoracic OPLL underwent surgery in which the authors' technique was used. Complete removal of the ossified PLL was achieved in all cases. With the patient in the prone position, the authors performed total resection of the posterior elements at the anterior decompression levels. This maneuver included not only laminectomies but also removal of the transverse processes and pedicles, which allowed space to be created bilaterally at the sides of the dural sac for the subsequent anterior decompression. The thoracic nerves at the levels of anterior decompression were ligated bilaterally and lifted up to manipulate the ossified ligament and the dural sac. An anterior decompression was then performed posteriorly. The PLL was floated without any difficulty. After exfoliation of the adhesions between the ossified ligament and the ventral aspect of the dural sac, the ossified PLL was removed. In every step of the anterior decompression, the space created in the bilateral sides of the dural sac allowed the surgeons to see the OPLL and anterolateral aspect of the dural sac directly and easily. After removal of the ossified PLL, posterior instrumented fusion was performed. This surgical procedure allows the surgeon to perform, safely and effectively, anterior decompression via a posterior approach for thoracic OPLL.