ArticleMedical science monitor : international medical journal of experimental and clinical research2026
Development and Clinical Feasibility of a Computer-Assisted Shape Design and Bending System for Spinal Fixation Rods.
Article in Medical science monitor : international medical journal of experimental and clinical research, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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7 authors.
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Abstract
BACKGROUND Spinal pedicle screw-rod fixation is widely used, but manual rod bending is time-consuming and prone to contour inconsistencies. Although computer-assisted technologies have been explored, existing systems remain limited by cost, complexity, and insufficient precision. This study evaluated a novel computer-assisted rod design and bending system, with the goal of testing whether computer-assisted rod bending reduces bending plus installation time vs manual bending in unilateral paired cases and to evaluate safety, feasibility, and rod-screw fitting accuracy. MATERIAL AND METHODS A prospective trial enrolled 26 patients (18-75 years) undergoing spinal pedicle screw-rod fixation (≥4 segments) for fractures or degenerative diseases. Twenty patients received unilateral computer-assisted bending (contralateral manual for comparison) and 6 received bilateral assisted bending. The primary outcome was bending plus installation time; secondary outcomes included complications and fitting accuracy. Wilcoxon signed-rank test was used (P<0.05). RESULTS No instrument-related complications were observed (n=26; median age 60.5 years). For 20 unilateral cases, computer-assisted bending (183.3±70.8 seconds) was significantly shorter than manual bending (236.1±119.1 s; mean reduction 52.75 seconds, P=0.017). Subgroup analyses indicated signals of greater time savings in more than 4 segments (93.9 seconds, P=0.039) and BMI of 25 kg/m2 or higher (95.3 seconds, P=0.005), although these were exploratory and not adjusted for multiplicity. CONCLUSIONS The computer-assisted system reduced bending plus installation time vs manual bending, with no instrument-related complications. Subgroup findings were exploratory and require further validation.
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