Objective Transient receptor potential vanilloid 4 (TRPV4), a mechanosensitive ion channel, has been implicated in intervertebral disc homeostasis; however, its role in autophagy regulation remains unclear. This study aimed to investigate whether agonist-induced TRPV4 activation promotes autophagy and extracellular matrix (ECM) synthesis in rat intervertebral discs.
Methods In vitro, rat nucleus pulposus (NP) cells were treated with the TRPV4 agonist (GSK1016790) under normal, serum-deprived, or interleukin-1β-stimulated conditions. Cell viability, intracellular Ca2+ influx, adenosine monophosphate-activated protein kinase/mammalian target of rapamycin (mTOR) (AMPK/mTOR) pathway, autophagy, ECM metabolism, apoptosis, and senescence were evaluated. In vivo, TRPV4 agonist was injected into the caudal discs subjected to temporary static compression, and disc changes were assessed by radiography, histomorphology, and immunofluorescence.
Results In vitro, agonist-induced TRPV4 activation rapidly increased intracellular Ca2+ influx and enhanced AMPK phosphorylation. A noncytotoxic concentration of the TRPV4 agonist (10 nM) was selected after dose-response testing. Under the inflammatory stress, TRPV4 agonist enhanced autophagy, promoted ECM synthesis, and suppressed apoptosis and senescence, leading to improved NP cell viability. In vivo, TRPV4 agonist treatment preserved radiographic disc height (p<0.01), reduced histomorphological degeneration (p<0.01), and increased expression of COL2A1, Brachyury, p-AMPK (phosphorylated AMPK), and autophagy markers (p<0.01) compared with controls.
Conclusion These findings demonstrated that TRPV4 activation promotes autophagy and ECM synthesis via the AMPK/mTOR pathway in rat discs and attenuates stress-induced degeneration, suggesting TRPV4 as a potential therapeutic target for disc degeneration.
Objective Spine surgeons are often at risk of radiation exposure due to intraoperative fluoroscopy, leading to health concerns such as carcinogenesis. This is due to the increasing use of percutaneous pedicle screw (PPS) in spinal surgeries, resulting from the widespread adoption of minimally invasive spine stabilization. This study aimed to elucidate the effectiveness of smart glasses (SG) in PPS insertion under fluoroscopy.
Methods SG were used as an alternative screen for fluoroscopic images. Operators A (2-year experience in spine surgery) and B (9-year experience) inserted the PPS into the bilateral L1–5 pedicles of the lumbar model bone under fluoroscopic guidance, repeating this procedure twice with and without SG (groups SG and N-SG, respectively). Each vertebral body’s insertion time, radiation dose, and radiation exposure time were measured, and the deviation in screw trajectories was evaluated.
Results The groups SG and N-SG showed no significant difference in insertion time for the overall procedure and each operator. However, group SG had a significantly shorter radiation exposure time than group N-SG for the overall procedure (109.1 ± 43.5 seconds vs. 150.9 ± 38.7 seconds; p = 0.003) and operator A (100.0 ± 29.0 seconds vs. 157.9 ± 42.8 seconds; p = 0.003). The radiation dose was also significantly lower in group SG than in group N-SG for the overall procedure (1.3 ± 0.6 mGy vs. 1.7 ± 0.5 mGy; p = 0.023) and operator A (1.2 ± 0.4 mGy vs. 1.8 ± 0.5 mGy; p = 0.013). The 2 groups showed no significant difference in screw deviation.
Conclusion The application of SG in fluoroscopic imaging for PPS insertion holds potential as a useful method for reducing radiation exposure.
Citations
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Objective To evaluate the preoperative and perioperative predictors of persistent leg numbness following lumbar fusion in patients aged ≥ 75 years.
Methods This single-center retrospective study examined 304 patients aged ≥ 75 years who underwent lumbar fusion for lumbar degenerative disease (102 men, 202 women; mean age, 79.2 [75–90] years). The visual analogue scale (VAS) score for leg numbness was examined preoperatively and at 2 years postoperatively. The persistent leg numbness group included patients with a 2-year postoperative VAS score for leg numbness ≥ 5 points. The demographic data were also reviewed. A multivariate stepwise logistic regression analysis was performed for variables with univariate analysis values of p < 0.2 on univariate analysis.
Results In total, 71 patients (23.4%) experienced persistent postoperative leg numbness. Multivariate logistic regression analysis revealed that a history of lumbar decompression, longer symptom duration, and a preoperative VAS score for leg numbness ≥ 5 points were associated with greater postoperative persistent leg numbness following lumbar fusion. In contrast, other factors, such as sex, body mass index, vertebral fracture, diabetes mellitus, depression, symptom duration, dural injury, operative time, and estimated blood loss, were not.
Conclusion A history of preoperative lumbar decompression, longer symptom duration, and greater preoperative VAS scores for leg numbness were preoperative predictors of persistent postoperative leg numbness following lumbar fusion in older patients. Although lumbar fusion is expected to improve leg numbness, surgeons should consider the surgical history, duration, and preoperative numbness intensity and explain the potential postoperative persistent leg numbness in advance.
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