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In this work, BC-PVA composite organohydrogels are prepared using polyvinyl alcohol (PVA) as matrix and bacterial cellulose (BC) nanofibers as reinforcement. BC-PVA@PPY conductive organohydrogels are obtained by depositing polypyrrole (PPY) on the BC-PVA organohydrogels via in situ polymerization of pyrrole. The mechanical properties of the organohydrogels are improved by the addition of BC nanofibers. The BC-PVA@PPY organohydrogels show good stability and repeatability in strain sensing. Due to their superior sensing performance, the BC-PVA@PPY organohydrogels can be used to monitor human activities (such as elbow movement and finger movement), indicating potential applications in wearable electronic devices. [ABSTRACT FROM AUTHOR]

Study Design: A retrospective cohort study. Purpose: This study aimed to assess the reliability of quantitative computed tomography (QCT) in measuring bone mineral density (BMD) of instrumented vertebrae and investigate the effect of less paraspinal muscle damage on BMD changes after lumbar interbody fusion. Overview of Literature: Patients always experience a decrease in vertebral BMD after lumbar interbody fusion. However, to the best of our knowledge, no study has analyzed the effect of paraspinal muscles on BMD changes. Methods: This retrospective analysis included a total of 155 patients who underwent single-level lumbar fusion, with 81 patients in the traditional group and 74 patients in the Wiltse group (less paraspinal muscle damage). QCT was used to measure the volumetric BMD (vBMD), Hounsfield unit value, and cross-sectional area of the paraspinal muscles at the upper instrumented vertebrae (UIV), vertebrae one segment above the UIV (UIV+1), and the vertebrae one segment above the UIV+1 (UIV+2). Statistical analyses were performed. Results: No significant differences in general data were observed between the two groups (p>0.05). Strong correlations were noted between the preoperative and 1-week postoperative vBMD of each segment (p<0.01), with no significant difference between the two time points in both groups (p>0.05). Vertebral BMD loss was significantly higher in UIV+1 and UIV+2 in the traditional group than in the Wiltse group (−13.6%±19.1% vs. −4.2%±16.5%, −10.8%±20.3% vs. −0.9%±37.0%; p<0.05). However, no statistically significant difference was observed in the percent vBMD changes in the UIV segment between the two groups (37.7%±70.1% vs. 36.1%±78.7%, p>0.05). Conclusions: QCT can reliably determine BMD in the instrumented spine after lumbar interbody fusion. With QCT, we found that reducing paraspinal muscle destruction through the Wiltse approach during surgery can help preserve the adjacent vertebral BMD; however, it does not help increase the BMD in the instrumented vertebrae. [ABSTRACT FROM AUTHOR]

The article titled "Retraction Note: Circular RNA circStag1 promotes bone regeneration by interacting with HuR" has been retracted by the authors. Concerns were raised about overlapping images and the reuse of data from the authors' previous article. The authors have acknowledged the inadvertent mixing of images during the preparation of the submitted materials due to the large number of images involved in the study. They are currently reviewing the data and plan to submit a revised manuscript for peer review. All authors have agreed to this retraction. [Extracted from the article]

Objective: To compare effectiveness of Dynesys and hybrid system in treating patients with multi-segmental lumbar degenerative disease (LDD)., Methods: Patients involved in this retrospective study were divided into Dynesys (n = 22) and Hybrid (n = 13) groups. Clinical outcomes were evaluated using Oswestry Disability Index (ODI), and Visual Analogue Scale (VAS). Radiologic evaluations included X-ray, MRI, and CT. Furthermore, different complications were analyzed., Results: At the last follow-up, ODI and VAS of each group were improved (p < 0.05), and the range of motion (ROM) of operating segments decreased. However, Dynesys group preserved a larger extent of ROM at the final follow-up (p < 0.05). ROM of the upper adjacent segment was increased in both groups (p < 0.05), while the disc heights were decreased at the final follow-up (p < 0.05). Besides, Dynesys group had a more obvious decrease in the disc height of dynamic segments (p < 0.05). No significant difference existed in complications between both groups (p > 0. 05)., Conclusion: In our study, similar satisfactory results were obtained in both groups. Both surgical procedures can be employed as effective treatments for middle-aged and physically active patients with multi-segmental LDD. Level of Evidence III; Retrospective Comparative Study. , Competing Interests: All authors declare no potential conflict of interest related to this article.