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Fig. 1 | BMC Musculoskeletal Disorders

Fig. 1

From: A novel posterior multiple screws distraction reducer system versus anterior release, posterior internal distraction, and subsequent spinal fusion for severe scoliosis

Fig. 1

Posterior rod-link-distraction-reducer (MSDR) system. a A coupling rod connected to distraction and derotation couplers; Three provisional rods are placed proximal, apical, and distal to the apex. Two manipulating arms and a cantilever are attached to the provisional rods and then linked to the coupling rod; these are adjusted using the distraction and derotation couplers. The manipulating arms and cantilever are used by the surgeon to correct deformities in the three planes. The significant lever arm forces generated allow the surgeon to easily and simultaneously derotate, translate, and correct the spine in the coronal, sagittal and axial planes. b Manipulating handle couples with the hexagonal connector to lock the manipulating arms. c MSDR provides correction force for distraction, derotation, and restoration of thoracic kyphosis. By using multiple screws connected with proximal rods, the correction forces are averagely distributed to 6–8 screws. The risk of screws loosening or failure during deformity correction process is significantly decreased. d Once correction has been achieved, the construct is rigidly locked and a permanent rod is placed and secured on the contralateral side

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