Medial Protrusio Technique Versus Structural Autologous Bone-Grafting Technique in Total Hip Arthroplasty for Crowe Type II to III Hip Dysplasia.

BACKGROUND: It is unclear whether acetabular reconstruction techniques have any impact on clinical outcomes. This study aimed to determine (1) whether acetabular reconstruction techniques influenced the position of the acetabular cup and (2) whether clinical outcomes based on the acetabular reconstruction techniques differ in patients undergoing total hip arthroplasty (THA) with Crowe II to III developmental dysplasia of the hip. METHODS: This was a retrospective analysis of prospectively collected data from 69 patients (74 hips) who were treated with cementless THA using medial protrusio technique (MPT) or structural autologous bone-grafting technique (SABT). There were 39 patients (41 hips) included in the MPT group and 30 patients (33 hips) in the SABT group. Clinical and radiographic outcomes were evaluated. RESULTS: All patients were followed up for at least 3 years. There were similar results between the 2 groups in terms of blood loss, Harris hip score, leg length discrepancy, cup inclination, cup anteversion, and proportion of cup coverage (P > .05). The operative time was significantly longer in the SABT group compared with the MPT group (P < .001). The postoperative vertical center of rotation was significantly higher in the MPT group compared with the SABT group (P = .001), and postoperative horizontal center of rotation was significantly shallower in the SABT group compared with the MPT group (P < .001). CONCLUSION: The MPT and SABT provide similar clinical and radiographic outcomes in the management of Crowe II to III developmental dysplasia of the hip by cementless THA. However, the MPT has the advantage of a shorter operative time, whereas the SABT is more conducive to placing the acetabular cup in an anatomic position. LEVEL OF EVIDENCE: Level III, Therapeutic, Case-Control Study.

[Emission Inventory of Anthropogenically Sourced VOCs and Its Contribution to Ozone Formation in Jiangsu Province].

Based on statistical activity data, emission factors, and source profiles, an emission inventory of anthropogenic-speciated VOCs in Jiangsu province in 2015 was calculated. The ozone formation potential (OFP) of VOCs was estimated by the maximum incremental reactivity (MIR). The result showed that the total anthropogenic emission amount of VOCs in Jiangsu Province was 1927.8 kt in 2015. Fossil fuel combustion, industrial processes, solvent utilization, biomass burning, vehicles, and storage and transport contributed 7.38%, 27.93%, 39.56%, 3.55%, 16.18%, and 5.39%, respectively. Suzhou, Nanjing, and Xuzhou were the three cities with the highest amount, contributing more than 200 kt of VOCs. The total amount of OFP from 56 ozone-precursor VOCs was 5429.5 kt. The contribution to OFP from the equipment manufacturing, vehicles manufacturing and building decoration was 30%-60% more than their contribution to the emissions. The coating VOC reduction would be more efficient for alleviating O3 pollution. The 10 VOC species with the largest OFP contribution were m/p-xylene, ethylene, propylene, 1,3-butadiene, toluene, o-xylene, 1-butene, ethylbenzene, 1,2,4-trimethylbenzene, and p-ethyltoluene, which contributed 75.63% of the total OFP.