UBE-Assisted ACDF Lowers Surgical Trauma in Cervical Spondylosis
Cervical spondylosis remains one of the most common reasons patients undergo anterior cervical discectomy and fusion, and the traditional operation has earned its place because it directly decompresses neural elements and restores stability. The tradeoff is familiar to spine surgeons: soft-tissue disruption, visible blood loss, and a recovery course shaped by the invasiveness of the exposure itself. Unilateral biportal endoscopic-assisted ACDF, or UBE-ACDF, was developed to preserve the core goals of fusion surgery while reducing the collateral tissue injury that comes with a standard open approach.
A retrospective comparative study from BMC Musculoskeletal Disorders evaluated whether that promise translated into measurable perioperative and radiographic differences. Eighty-four patients with cervical spondylosis were divided into a UBE-ACDF cohort of 32 and a conventional ACDF cohort of 52. The two groups were well matched at baseline, which strengthens the comparison even though the design was not randomized. The central question was straightforward: can a less invasive corridor deliver the same neurological recovery without sacrificing alignment correction or long-term symptom control?
Blood Loss and Hospital Stay Favored the Endoscopic Approach
The perioperative data tilted clearly toward the minimally invasive arm. Patients who underwent UBE-ACDF had a shorter hospital stay, with a statistically significant difference favoring the endoscopic technique. Intraoperative visible blood loss was also markedly lower: 143.97 mL in the UBE-ACDF group versus 375.81 mL in the conventional ACDF group, with P < 0.001. Those numbers are not cosmetic. Lower blood loss often reflects narrower dissection, less muscular and prevertebral tissue disruption, and a more controlled operative field, all of which can matter when surgeons are trying to balance decompression, implant placement, and postoperative recovery.
The study also examined other perioperative variables, including operation time, incision length, hidden blood loss, and hospitalization cost. The abstract does not provide the full numeric breakdown for each of those endpoints, but the overall pattern supports the core premise of UBE-ACDF: less operative trauma without abandoning the anterior fusion strategy. In day-to-day practice, a smaller incision and reduced visible blood loss can translate into earlier mobilization and a smoother immediate postoperative course, especially in patients where soft-tissue tolerance is limited.
Neurological Recovery Improved in Both Groups
Clinical function improved meaningfully in both cohorts over follow-up. Pain and disability scores, including VAS, NDI, and JOA, were tracked at multiple time points, and the overall trajectory showed postoperative benefit regardless of surgical approach. The neurological upside of ACDF is expected: by removing the compressive disc and stabilizing the motion segment, the operation addresses the mechanical drivers of radiculopathy and myelopathic symptoms.
A single sentence captures the most important divergence in the symptom data. At final follow-up, arm pain relief was better in the conventional ACDF group.
The final follow-up VAS-arm score was significantly higher in the UBE-ACDF group, with P = 0.005, indicating that conventional ACDF produced greater long-term arm pain relief in this comparison. The reason is not obvious from the abstract alone, but it raises several clinically relevant possibilities: subtle differences in decompression completeness, postoperative segment behavior, or the durability of symptom control after endoscopic manipulation. Even when two procedures appear similar in the operating room, small differences in root decompression and endplate preparation can influence pain trajectories months later.
Alignment Correction Improved, but Sagittal Interpretation Was Uneven
Radiographic outcomes matter in cervical fusion because pain relief alone does not define success. Segmental Cobb angle, disc height, and sagittal balance were included in the analysis, and the UBE-ACDF group showed greater intervertebral height restoration. Restoring disc height is not just a technical victory. It can widen the foramina, reduce residual root tension, and help reestablish the local mechanics that support both decompression and fusion.
Sagittal alignment analysis was less tidy. The abstract states that interpretation of T1 slope changes was limited by significant baseline differences between groups. In plain clinical terms, the two cohorts did not start from the same sagittal alignment position, which makes it difficult to attribute later T1 slope changes solely to the operative method. Cervical alignment is sensitive to preoperative anatomy, adjacent segment geometry, and compensatory posture, so any radiographic comparison has to be read with caution when baseline imbalance is present. The study therefore supports the idea that UBE-ACDF can restore disc height effectively, but it does not establish a clean superiority claim for all sagittal parameters.
What the Comparative Data Suggest for Spine Surgery Practice
The real value of this study lies in the balance it reveals. UBE-ACDF appears feasible and clinically effective for selected patients with cervical spondylosis. It reduces perioperative surgical trauma, shortens hospitalization, and still delivers neurological recovery comparable to conventional ACDF across the measured functional scales. For surgeons seeking a less invasive route, that is a meaningful finding, especially in patients for whom minimizing exposure and blood loss is a priority.
Yet the comparison is not one-sided. Conventional ACDF produced better long-term arm pain relief in this cohort, and that matters because radicular pain is often the symptom patients feel most acutely in daily life. The study does not prove that endoscopic assistance is inferior, but it does show that a smaller incision and lower blood loss do not automatically guarantee equal symptom control at later follow-up. Surgical innovation has to earn its place against the long-established operation on outcomes patients can feel, not only on the elegance of the approach.
Fusion durability also remains unresolved. The investigators explicitly call for larger prospective studies with longer follow-up to confirm fusion-related outcomes and long-term radiographic durability. That caution is appropriate. Fusion surgery is judged over years, not weeks, and early perioperative gains can be offset if alignment settles, symptoms recur, or fusion biology proves less robust than expected. For now, UBE-ACDF looks like a credible minimally invasive alternative, but conventional ACDF still holds an edge in at least one clinically important pain endpoint, and the longer-term structural consequences remain incompletely defined.