Structural Ni0-Niδ+ Pair Sites for Highly Active Hydrogenation of Nitriles to Primary Amines.

Supported metal pair sites have sparked interest due to their tremendous potential as bifunctional catalysts. Here, we report the structural Ni0-Niδ+ pair sites constructed in a well-defined nanocrystal phase of Ni3P. These Ni0-Niδ+ pair sites exhibited a remarkable product formation rate of 123 molBA/molmetal/h for the hydrogenation of benzonitrile (BN) to benzylamine (BA). The heterogeneity of surface Ni atoms over the Ni3P crystal created two types of metal centers, Ni0 and Niδ+, with a specific spatial distance of 4-5 Å. The Ni0 site acted as the center for H2 activation, while the Niδ+ site served as the adsorption and activation center for the C ≡ N group. The highly efficient cooperation effect of Ni0-Niδ+ pair sites resulted in a TOF of 2915 h-1 in BN hydrogenation, which is 2.4 and 9.7 times higher than that over the mono-Ni0 and -Niδ+ sites, respectively.

Significance of the neutrophil-to-lymphocyte ratio in predicting the response to neoadjuvant chemotherapy in extremity osteosarcoma: a multicentre retrospective study.

BACKGROUND: At present, no predictive factor has been validated for the early efficacy of neoadjuvant chemotherapy (NACT) in osteosarcoma. The purpose of this study was to investigate the significance of the neutrophil-to-lymphocyte ratio (NLR) in predicting the response to NACT in extremity osteosarcoma. METHODS: Pathological complete response (pCR) was used to assess the efficacy of NACT. Receiver operating characteristic (ROC) curves and the Youden index (sensitivity + specificity-1) were used to determine the optimal cut-off values of the NLR. Univariate and multivariate analyses using logistic regression models were conducted to confirm the independent factors affecting the efficacy of NACT. RESULTS: The optimal NLR cut-off value was 2.36 (sensitivity, 80.0%; specificity, 71.3%). Univariate analysis revealed that patients with a smaller tumour volume, lower stage, lower NLR and lower PLR were more likely to achieve pCR. Multivariate analyses confirmed that the NLR before treatment was an independent risk factor for pCR. Compared to patients with a high NLR, those with a low NLR showed a more than 2-fold higher likelihood of achieving pCR (OR 2.82, 95% CI 1.36-5.17, p = 0.02). CONCLUSION: The NLR is a novel and effective predictive factor for the response to NACT in extremity osteosarcoma patients. Patients with a higher NLR showed a lower percentage of pCR after NACT.

Aneurysmal bone cyst secondary to giant cell tumor of the extremities: a case series of 30 patients.

The purpose was to investigate the clinical features, diagnosis, treatment, and prognosis of aneurysmal bone cyst (ABC) secondary to giant cell tumors (GCT) of the extremities. Data from patients with ABC secondary to GCT of the extremities were obtained from the medical records. Clinical features, imaging findings, pathologic diagnosis, surgical methods, and prognosis were analyzed. The median age of the patients was 33 years (range 15 to 52 years) and 83.3 percent were between 20 to 40 years. The lesions were mainly located in the proximal tibia and distal femur, accounting for 63.3% (19/30). 21 patients were treated with curettage, and 9 with tumor resection. The recurrence rates of the curettage group and resection group were 52.4% and 11.1% respectively. However, the average postoperative (Musculoskeletal Tumor Society) MSTS score were 28.6±1.2 post-curettage, and 25.0±0.5 post-resection, with a significant difference between the 2 groups (P<0.01). In these relapsed patients, 10 underwent a second curettage, while 2 cases underwent a resection and there was no postoperative re-recurrence in both groups. A comprehensive analysis should be performed when making the diagnosis of ABC secondary to GCT. Although the recurrence rate is higher, curettage is still the optimal method for satisfactory joint function. If recurrence occurs after the first curettage, a second curettage should be performed.

Impacts of the perioperative fast track surgery concept on the physical and psychological rehabilitation of total hip arthroplasty: A prospective cohort study of 348 patients.

ABSTRACT: Studies have shown that rapid rehabilitation surgery has a positive effect on recovery after major orthopedic surgery. However, very few studies have examined the impact of fast track surgery on physical and psychological rehabilitation in patients who have undergone total hip replacement.This study aimed to investigate the value of the rapid rehabilitation surgical model for patients undergoing total hip arthroplasty during the perioperative period.We conducted a prospective cohort study that included patients who underwent total hip arthroplasty at our hospital from January 2015 to December 2018. We divided the patients into 2 groups - the rapid rehabilitation group and the conventional rehabilitation group - and compared their length of hospital stay, time to off-bed activity, pain score, Self-Rating Anxiety Scale scores, Self-Rating Depression Scale scores, complication rate, and rate of satisfaction during hospitalization.A total of 348 patients were included in the study. Of these, 180 received rapid rehabilitation nursing and 168 patients received conventional nursing. Compared with the patients in the conventional rehabilitation group, those in the rapid rehabilitation group had shorter hospital stays (11.5 ±â€Š1.2 day vs 15.5 ±â€Š2.3 day, P = .021), resumed off-bed activities sooner (20.5 ±â€Š3.4 hours vs 61.8 ±â€Š4.7 hours, P = .001, had less postoperative pain (4.0 ±â€Š1.2 vs 6.5 ±â€Š1.1, P < .001), and lower anxiety and depression scores (anxiety score: 24.4 ±â€Š2.1 vs 47.9 ±â€Š2.9; depression score: 25.8 ±â€Š1.8 vs 43.7 ±â€Š1.7, P < .001).The application of rapid rehabilitation surgery in total hip arthroplasty can accelerate patients' postoperative recovery, relieve anxiety and depression, and increase the patient's satisfaction with the treatment.

[Long-term follow-up of early-middle stage avascular necrosis of femoral head with core decompression and bone grafting].

OBJECTIVE: To evaluate the long-term effectiveness of treating early-middle stage avascular necrosis of the femoral head (ANFH) with core decompression and bone grafting. METHODS: Between January 2000 and December 2006, 87 ANFH patients (114 hips) were treated with core decompression and bone grafting, including 54 cases (62.1%) of alcohol-induced ANFH, 26 cases (29.9%) of steroid-induced ANFH, and 7 cases (8.0%) of idiopathic ANFH. There were 74 males (97 hips) and 13 females (17 hips), aged 20-56 years (mean, 38 years). The disease duration was 3-46 months (mean, 18 months). According to Ficat staging, 16 hips were at stage I, 68 hips at stage II, and 30 hips at stage III. The Harris score and Ficat stage were compared between pre- and post-operation to assess the outcomes clinically and radiologically. The hip survival was analyzed by the Kaplan-Meier method. RESULTS: Eighty-seven patients were followed up 5 years to 11 years and 10 months (mean, 8 years and 9 months). The Harris hip score was significantly increased from 73.13 +/- 7.17 at preoperation to 81.59 +/- 13.23 at postoperation (t = -9.318, P = 0.000). The clinical success rate was 69.3% (79/114) and the radiological success rate was 54.4% (62/114). Kaplan-Meier survival analysis showed that the overall survival rate was 84.2% (96/114); the survival rates of Ficat stage I [100% (16/16)] and stage II [91.2% (62/68)] were higher than that of stage III [60.0%(18/30)] (P < 0.01); there was no significant difference between Ficat stage I and II (chi2 = 1.520, P = 0.218). CONCLUSION: Core decompression with bone grafting is a safe and effective procedure for the treatment of Ficat stages I-II (early stage) ANFH, and the long-term effectiveness is satisfactory. But the long-term effectiveness is unsatisfactory for the patients at the Ficat stage III (middle stage).