高龄患者人工全膝关节置换术的并发症及疗效分析

目的探讨年龄大于75岁的高龄患者进行全膝关节置换术的并发症情况及疗效。方法系统回顾分析2006年8月至2012年12月,共62例(72膝)大于75岁实施全膝关节置换术的患者,记录术前合并症和术后并发症的情况。术后2周,1.5、3、6、12月及之后每年门诊随访,应用HSS评分进行评估。结果所有62例患者中,术中没有死亡和局部并发症。围术期术后系统性并发症31例,并发症发生率为43.1%,共有8例(12膝)失访,54例(60膝)获得随访,随访时间12~72个月,平均(36.9±3.5)个月。HSS评分恢复到平均(86.2±12.8)分,优良率88.3%。结论通过术前合理选择病例,术中、术后密切监护调整,加强出院后的随访和功能康复指导,可以有效地降低术后的各种并发症,使得全膝关节置换术也可以在高龄患者中获得满意的疗效。     

Perioperative corticosteroids administration as a risk factor for pressure ulcers in cardiovascular surgical patients: a retrospective study

The aim of this study was to investigate the relationship between perioperative corticosteroids administration and the incidence of pressure ulcers (PUs) in cardiovascular surgical patients. A retrospective analysis was performed on data from consecutive patients who had cardiac surgery in 2012. Univariate and multivariate logistic regression analyses were performed to evaluate the relationship between perioperative corticosteroid administration and the incidence of surgery‐related PU (SRPU). A total of 286 cardiac surgery patients were included in this study; of these, 47 patients developed 57 SRPUs, an incidence of 16·4% [95% confidence interval (CI): 12·3–21·2%). The SRPU incidence was significantly higher in corticosteroid‐administered group compared with groups not receiving corticosteroids (43·8% versus 14·8%, Pearson's χ² = 9·209, P = 0·002). The crude odds ratio (OR) was 4·472 (95% CI: 1·576–12·694). After performing multivariate logistic regression analysis, the adjusted OR was 2·808 (95% CI: 1·062–11·769). This result showed that perioperative corticosteroid administration was an independent risk factor for PUs in cardiovascular surgical patients. Therefore, it is recommended that in order to prevent PU perioperative corticosteroids should be administered with caution to cardiovascular surgical patients.     

Effects of a novel magnetic orthopedic appliance (MOA-III) on the dentofacial complex in mild to moderate skeletal class III children

Introduction

The objective of this study was to evaluate the changes of skeletal and dental structures in mild to moderate skeletal Class III children following the use of a new magnetic orthopedic appliance (MOA-III).

Methods

A total of 36 patients (14 boys and 22 girls, mean age 9 years and 5 months) who presented with a mild to moderate skeletal Class III jaw discrepancy were treated with MOA-III. Another group of 20 untreated patients (9 boys and 11 girls, mean age 9 years and 2 months) with the same level of deformity served as the control group. The average treatment time was 6.6 months. Radiographs were taken at the same time intervals for both groups. A paired t test was used to determine the significant differences before and after treatment, and a two-sample t test was used to analyze the differences between the treatment and control groups.

Results

The anterior crossbite in all subjects was corrected after MOA-III therapy. The maxillomandibular relationship showed favorable changes (ANB, Wits, overjet increased significantly, P < 0.001). The maxilla was anteriorly positioned (SNA, ptm-A, ptm-S increased significantly, P < 0.001) with clockwise rotation (PP-FH increased, P < 0.001). The mandible showed a slight downward and backward rotation (SNB decreased, P < 0.05, MP-SN, Y-axis increased, P < 0.05). The length of the mandibular body showed no significant changes (Go-Pg, P?>?0.05). Significant upper incisor proclination and lower incisor retroclination were observed (UI-NA increased, P < 0.001, LI-NB, FMIA decreased, P < 0.001). The upper lip moved forward, and the lower lip moved backward (UL-EP increased, P?<?0.001, LL-EP decreased, P?<?0.05). In the control group, most of the parameters showed normal growth, except for some unfavorable mandibular skeletal and soft tissue changes (Go-Pg, Go-Co, MP-SN, N′-SN-Pg′ increased, P < 0.001). Significant positive changes were induced with the MOA-III appliance compared to the untreated group.

Conclusions

The MOA-III was effective for the early treatment of a mild to moderate Class III malocclusion in children.

     

In vitro expression and functional characterization of NPA motifs in aquaporins of Nosema bombycis

Parasitology Research - Nosema bombycis contains functional aquaporins (NbAQPs), which are key targets for exploring the mechanism of N. bombycis infection; however, the regulation of these NbAQPs...     

Natural Polyphenols Enhance Stability of Crosslinked UHMWPE for Joint Implants

Background

Radiation-crosslinked UHMWPE has been used for joint implants since the 1990s. Postirradiation remelting enhances oxidative stability, but with some loss in strength and toughness. Vitamin E-stabilized crosslinked UHMWPE has shown improved strength and stability as compared with irradiated and remelted UHMWPE. With more active phenolic hydroxyl groups, natural polyphenols are widely used in the food and pharmaceutical industries as potent stabilizers and could be useful for oxidative stability in crosslinked UHMWPE.

Questions/purposes

We asked whether UHMWPE blended with polyphenols would (1) show higher oxidation resistance after radiation crosslinking; (2) preserve the mechanical properties of UHMWPE after accelerated aging; and (3) alter the wear resistance of radiation-crosslinked UHMWPE.

Methods

The polyphenols, gallic acid and dodecyl gallate, were blended with medical-grade UHMWPE followed by consolidation and electron beam irradiation at 100 kGy. Radiation-crosslinked virgin and vitamin E-blended UHMWPEs were used as reference materials. The UHMWPEs were aged at 120 °C in air with oxidation levels analyzed by infrared spectroscopy. Tensile (n = 5 per group) and impact (n = 3 per group) properties before and after aging as per ASTM F2003 were evaluated. The wear rates were examined by pin-on-disc testing (n = 3 per group). The data were reported as mean ± SDs. Statistical analysis was performed by using Student’s t-test for a two-tailed distribution with unequal variance for tensile and impact data obtained with n ≥ 3. A significant difference is defined with p < 0.05.

Results

The oxidation induction time of 100 kGy UHMWPE was prolonged to 144 hours with 0.05 wt% dodecyl gallate and 192 hours with 0.05 wt% gallic acid compared with 48 hours for 0.05 wt% vitamin E-blended UHMWPE. Accelerated aging of these polyphenol-blended UHMWPEs resulted in ultimate tensile strength of 50.4 ± 1.4 MPa and impact strength of 53 ± 5 kJ/m² for 100 kGy-irradiated UHMWPE with 0.05 wt% dodecyl gallate, for example, in comparison to 51.2 ± 0.7 MPa (p = 0.75) and 58 ± 5 kJ/m² (p = 0.29) before aging. The pin-on-disc wear rates of 100 kGy-irradiated UHMWPE with 0.05 wt% dodecyl gallate and 0.05 wt% gallic acid were 2.29 ± 0.31 and 1.65 ± 0.32 mg/million cycles, comparable to 1.68 ± 0.25 and 2.05 ± 0.22 mg/million cycles for 100 kGy-irradiated virgin and 0.05 wt% vitamin E-blended UHMWPE.

Conclusions

Based on the sample numbers tested in this study, polyphenols appear to effectively enhance the oxidation stability without altering the mechanical properties or pin-on-disc wear rate of radiation-crosslinked UHMWPE.

Clinical Relevance

Crosslinked UHMWPE with natural polyphenols with improved oxidative stability and low wear may find clinical application in joint implants.