目的 比較低頻與高頻探頭超聲對急性闌尾炎的診斷價值。 方法 對2010年1月－2011年6月120例急性闌尾炎的手術病理結果與超聲檢查結果進行回顧性分析，比較低、高頻探頭超聲對急性闌尾炎的診斷價值。 結果 120例急性闌尾炎中，通過低頻探頭超聲檢出67例（55.8%），通過高頻探頭超聲檢出105例（87.5%）；單純性闌尾炎以及化膿性和壞疽性闌尾炎高頻探頭超聲檢出例數明顯大于低頻探頭超聲，差異有統計學意義（P＜0.05）；闌尾周圍膿腫低、高頻探頭超聲均全部檢出。 結論 高頻探頭超聲對急性闌尾炎的檢出率高于低頻探頭超聲，但二者各有所長，在臨床中聯合應用能有效提高急性闌尾炎的超聲診斷符合率。
ObjectiveTo conduct a comprehensive analysis of proximal humeral anatomical characteristics in the Chinese population utilizing three-dimensional reconstruction technology, thereby establishing an evidence base for the enhancement of shoulder hemiarthroplasty procedures and the development of domestically manufactured prostheses. Methods The study cohort comprised 30 patients (60 shoulders) presenting with cervicoscapular pain between July 2023 and June 2025, with equal gender distribution (15 males and 15 females); age distribution ranged from 20 to 75 years (mean, 53.7 years). Data acquisition was performed via high-resolution CT imaging (technical parameters: slice thickness 0.625 mm, voltage 120 kV, current 150 mA, matrix 512×512). Subsequently, CT datasets were processed in DICOM format using Mimics17.0 software for three-dimensional reconstruction, followed by quantitative assessment via Imageware12.0 software to evaluate key proximal humeral parameters: humeral head dimensions (coronal diameter, sagittal diameter, surface curvature diameter, thickness), angular measurements [neck-shaft angle, retroversion angle (retroversion angle 1 was the angle between the humeral head axis and the line connecting the medial and lateral condyles, and retroversion angle 2 was the angle between the humeral head axis and the tangent of the trochlea)], and positional metrics (medial offset, posterior offset). Statistical analysis incorporated Pearson correlation coefficients to determine parameter relationships, with comparative evaluations conducted across demographic variables including gender, height, body mass, and age. Results Quantitative analysis yielded the following measurements: humeral head coronal diameter (41.8±3.6) mm, sagittal diameter (39.1±4.1) mm, surface curvature diameter (44.9±4.6) mm, thickness (17.2±1.8) mm, neck-shaft angle (128.4±4.2)°, retroversion angle 1 (16.9±8.9)°, retroversion angle 2 (21.4±11.3)°, medial offset (3.8±1.7) mm, and posterior offset (5.1±1.6) mm. Correlation analysis demonstrated the most pronounced positive relationship between humeral head surface curvature diameter and thickness (r=0.966, P=0.001), with additional significant positive correlations observed between surface curvature diameter and coronal diameter (r=0.842, P=0.001), posterior offset and retroversion angle 1 (r=0.766, P=0.001), and coronal diameter and thickness (r=0.727, P=0.001). Demographic analysis revealed significantly greater dimensions in males compared to females for humeral head surface curvature diameter, coronal diameter, sagittal diameter, and thickness (P<0.05), with these parameters demonstrating progressive increases corresponding to height (P<0.05). With the exception of neck-shaft angle, all parameters exhibited a positive correlation with body mass. No significant age-related differences were detected across parameters (P>0.05). Conclusion The proximal humeral morphology in the Chinese population exhibits substantial variability, necessitating optimization of prosthetic designs based on population-specific anatomical metrics to enhance the efficacy of personalized clinical interventions.