Previous studies of ancient jade using portable X-ray fluorescence (pXRF) have mostly focused on mineral identification, alteration status and provenance determination. It is usually used as an auxiliary instrument for spectroscopic detection with finer resolution. However, there is no substitute for the efficiency and stability of pXRF in-situ non-destructive analysis, which is less affected by the test environment. The scale of the data from the pXRF analysis did not allow for a more in-depth interpretation of ancient jade in the past. In this study, pXRF has been carried out for a total of 112 pieces of nephrite artifacts unearthed from the Yuehe tomb No.1 in Nanyang City, Henan Province, Central China. Certain patterns become clearer as the size of the data increases. The coefficient of variation, cluster analysis and correlation analysis can be used to separate elements into different assemblages, revealing whether the elements are from the primary and impurity minerals of nephrite itself, from the burial microenvironment in the soil, or even from other specific sources. In addition, most of the secondary whitening occurring in the batch of nephrite are accompanied by an increase in Ca content, confirming the previously refuted theory of calcification. More importantly, the principal component analysis of the twin nephrite artifacts suggests visually indistinguishable elemental changes caused by secondary changes, which may lead to misjudgment of ancient nephrite provenance using elemental data.
Objective: The aim of this retrospective study was to investigate clinical effects of the treatment of intra-articular distal humeral fractures via the combined posterior olecranon osteotomy and anterior approach and the combined lateral Kaplan approach associated with the medial approach. Methods: Between July 2010 and September 2019, 28 cases of intercondylar fractures of the distal humerus (AO/OTA type C) were treated by open reduction and internal fixation (ORIF) via the posterior and anterior approach and combined lateral-medial approach, which were divided into the P-A (n = 13) and L-M (n = 15) groups, respectively. The outcomes in terms of function were assessed using the range of motion (ROM) of the elbow and forearm, humerotrochlear (HT) angle, Visual Analogue Scale (VAS) scores, Mayo Elbow Performance Score (MEPS), and efficacy grade evaluated using the scoring system of Orthopaedic Trauma Association (OTA) at the one-year follow-up. Results: The flexion-extension of elbows and pronation-supination of forearms were respectively 114.1° ± 12.4° and 157.3° ± 9.6° in the P-A group and 117.1° ± 14.5° and 161.3° ± 10.7° in the L-M group. No significant difference was observed between the two groups for the elbow and forearm ROM (p > 0.05). Furthermore, surgery duration, blood loss volume, HT angle, MEPS, VAS scores, OTA rating, and the morbidity of postoperative complications during the one-year follow-up did not differ between groups. Conclusion: The posterior olecranon osteotomy and anterior approach can be used efficiently for exposure of complex distal humeral injuries with similar clinical efficacy and complications in the treatment of intra-articular distal humeral fractures as compared to the lateral-medial approach.
Previous studies of ancient jade using portable X-ray fluorescence (pXRF) have mostly focused on mineral identification, alteration status and provenance determination. It is usually used as an auxiliary instrument for spectroscopic detection with finer resolution. However, there is no substitute for the efficiency and stability of pXRF in-situ non-destructive analysis, which is less affected by the test environment. The scale of the data from the pXRF analysis did not allow for a more in-depth interpretation of ancient jade in the past. In this study, pXRF has been carried out for a total of 112 pieces of nephrite artifacts unearthed from the Yuehe tomb No.1 in Nanyang City, Henan Province, Central China. Certain patterns become clearer as the size of the data increases. The coefficient of variation, cluster analysis and correlation analysis can be used to separate elements into different assemblages, revealing whether the elements are from the primary and impurity minerals of nephrite itself, from the burial microenvironment in the soil, or even from other specific sources. In addition, most of the secondary whitening occurring in the batch of nephrite are accompanied by an increase in Ca content, confirming the previously refuted theory of calcification. More importantly, the principal component analysis of the twin nephrite artifacts suggests visually indistinguishable elemental changes caused by secondary changes, which may lead to misjudgment of ancient nephrite provenance using elemental data.
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