Abstract
Introduction: Technique of dynamic fixation for treatment of lumbar degenerative has been developed in avoidance of possible adjacent level degeneration. The dynamic rod, consists of titanium alloy cable cord and polyetheretherketone shell, of K-rod posterior dynamic rod system provides flexible feature that mobility preservation of instrumented level shall be achieved. Clinical research for the usage of K-rid system has not been reported with evidence-based support. This retrospective study was aimed to report clinical outcome of K-rod posterior dynamic rod system utilized for degenerative lumbar disease. Methods: Fifty patients with lumbar degenerative disease ranged from L3 to S1 have been enrolled. Dynamic and hybrid (dynamic rod accompanied by rigid rod) fixations of K-rod system were adequately selected for patients after discectomies of diseased intervertebral discs. Clinical evaluations including Japanese Orthopedidc Association Scores (JOA), Oswestry Disability Index (ODI), and Visualized Analogue Scale (VAS) have been conducted pre- and post-operatively. Results: In the follow-up period (12-36 months, mean 26.4 months), great improvements in JOA, ODI, and VAS were respectively 73.34%, 37.18%, and 77.35% in dynamic fixation group, while those in hybrid fixation group were respectively 76.37%, 30.5%, and 71.68%, with no statistical difference between the two groups. Significantly reduced mobility has been observed in hybrid fixation group compared with its preoperative status. Conclusions: Current follow-up report of K-rod posterior dynamic rod system represented acceptable clinical satisfactory. The preserved mobility of instrumented segment based on sufficient biomechanical stability can successfully achieve pain relief and functional restoration.
Highlights
Technique of dynamic fixation for treatment of lumbar degenerative has been developed in avoidance of possible adjacent level degeneration
Fifty patients with lumbar degenerative disease ranged from L3 to S1 have been enrolled
By substituting the rigid rod component in conventional pedicle screw system, the flexible feature of the K-Rod system is contributed by its flexible rod consists of titanium alloy cable cords and Polyetheretherketone (PEEK) shells, with an optional combination with rigid rod adjacent to the flexible segment
Summary
Technique of dynamic fixation for treatment of lumbar degenerative has been developed in avoidance of possible adjacent level degeneration. Clinical research for the usage of K-rid system has not been reported with evidence-based support This retrospective study was aimed to report clinical outcome of K-rod posterior dynamic rod system utilized for degenerative lumbar disease. Spinal rod and pedicle screw fixation represent gold standard in treatment of general degenerative disease of spine, but the loss of segmental motion and the frequently reported complications such as stiff spine, stress-shielding, implant failure, fatigue fractures, and adjacent segment degeneration [1,2,3] are challenged in recent decades. Novel concept of the semi-rigid fixation has been introduced with the constrained-dynamic feature Commercial products such as the Isobar (Alphatec Spine, Inc.), BioFlex (Bio-Spine), and DYNESYS (Zimmer, Inc.) are available in current with numerous supportive clinical and biomechanical studies. Due to that few information about the clinical information has been reported in previous literatures, current study aimed to reveal the observation of clinical outcome of K-Rod system via minimal follow-up duration of 12 months
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