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  • A Unique Fixation Technique for Femoral Shaft Allograft Fixation with Lag Screw Fixation

    Final Number:

    Ali Shirzadi MD; Doniel Drazin MD MA; Michael Scott Turner MD; Beren Tomooka; Terrence T. Kim MD; J. Patrick Johnson MD

    Study Design:

    Subject Category:

    Meeting: Congress of Neurological Surgeons 2011 Annual Meeting

    Introduction: Femoral allograft is an ideal bone graft for reconstruction of osteomyelitis due to biocompatibility, size, and stability. The challenges of any lumbar vertebrectomy reconstruction procedure for these very challenging reconstruction problems is usually due to chance of graft dislodgement and the limited exposure of adjacent vertebral body that prevents anterior plating. We have used a unique fixation technique that we have developed using small and large fragment bone screws placed across the femoral allograft into adjacent vertebral bodies to achieve solid fixation of the anterior reconstruction and prevent graft dislodgement.

    Methods: We performed retrospective chart reviews of 9 patients treated for thoracolumbar spinal osteomyelitis that progressed to anterior column failure and spinal instability. All underwent femoral allograft interbody reconstruction with anterior fixation of the graft with a unique bicortical, transvertebral lag screw technique at both ends of the graft to achieve solid fixation of the graft. The constructs were further stabilized with posterior pedicle screws. All patients were followed with TLSO brace and immediate ambulation post-operatively.

    Results: After circumferential spinal fusion, none of the patients experienced any reposition of the graft or failure of the construct. They had stable post-operative neurological exams with reduced morbidity due to immediate ambulation and therapy.

    Conclusions: Femoral allograft interbody fusion with two end graft-body bicortical lag screws provides an anterior column construct which prevents graft repositioning and reduces hardware in a previously infected spine. This novel technique, combined with posterior pedicle screw fixation, creates a durable circumferential fusion allowing patients to be active post-operatively with reduced morbidity.

    Patient Care: With this new technique, it offers more stability of the construct with less hardware, earlier mobilization, reduced morbidity

    Learning Objectives: Femoral allograft interbody fusion with bicortical lag screws is safe and is a novel durable construct.


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