Hypothesis: We sought to determine the angle of osteotomy that produces a circular humeral cut surface.
Methods: A total of 49 cadaveric shoulders, from 25 cadavers, underwent sequential humeral head osteotomy from 180° (vertical, in line with the humeral diaphyseal shaft), in 10° increments, until the rotator cuff insertion was encountered. At each stage, the anteroposterior (AP) and superoinferior (SI) distances were recorded. The data were analyzed for normality and then assessed to determine the optimum cut angle.
Results: The AP/SI ratio is an indication of roundness. Plotting values of 1 - AP/SI (ie, error) vs. cut angle allowed us to plot the likelihood of producing a circular cut surface using a third-order curve that created the best fit to the data set (R = 0.99). The results from this study suggest that the optimum osteotomy angle that produces a circular cut surface is 23° from the vertical. The cohort data illustrated that at this angle, the average roundness error was 1% with a 95% confidence limit of <1%. There was no significant difference (P > .05) between sexes.
Conclusion: The humeral head shape changes from oval to circular and then to an oval cut surface as the osteotomy angle increases from the vertical toward the horizontal. The range of angles within which the cut surface is circular, within a 10% error margin, is 18°-27° from the vertical, which is much less than the traditional osteotomy angle of 45°.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jse.2021.08.018 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Effects of ascorbic acid treatment on starch metabolism during wound healing in fresh-cut potatoes.
Carbohydr Polym
March 2025
College of Life Sciences, Dalian Minzu University, Dalian 116600, China; Key Laboratory of Biotechnology and Bioresources Utilization, Ministry of Education, Dalian 116600, China. Electronic address:
Starch degradation and wound healing occur in potato tubers following fresh-cut processing, and ascorbic acid (AA) treatment can suppress these processes, though the underlying regulatory mechanisms remain unclear. This study investigated the effects of 5 g L AA treatment on the multiscale structural changes and metabolic responses of starch during wound healing in fresh-cut potatoes. The results revealed that AA treatment delayed starch degradation and reducing sugar accumulation while promoting sucrose and fructose accumulation.
View Article and Find Full Text PDFSerum NfL predicts outcome and secondary autoimmunity in herpes-simplex encephalitis.
J Neuroimmunol
January 2025
Institute of Clinical Chemistry, University Hospital Schleswig-Holstein Kiel/Lübeck, Germany.
Objectives: Herpes simplex virus 1 encephalitis (HSE) is the most common infectious encephalitis in developed countries. We aimed to evaluate the association of serum neurofilament light chain (sNfL) with disease severity, outcome and secondary anti-neuronal autoantibodies in a retrospective cohort study.
Methods: We retrospectively identified 30 patients with HSE and 132 controls (bacterial meningoencephalitis BM n = 27, non-bacterial meningitis NBM n = 33, healthy controls = 72).
Removal of an incarcerated intrauterine device reaching the serosal surface of the uterus by hysteroscopy alone: a case report.
Front Med (Lausanne)
January 2025
Department of Gynecology and Obstetrics, International Peace Maternity and Child Health Hospital Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Embryo Original Diseases, Shanghai Municipal Key Clinical Specialty, Shanghai, China.
Background: An intrauterine device (IUD) is a widely used long-term contraceptive device for family planning. However, the IUD can lead to various complications. Severe complications and remedial measures caused by IUDs have been reported in the literature; however, detailed surgical approaches for safely removing the IUD within the minimum surgical range have rarely been described especially in postmenopausal women.
View Article and Find Full Text PDFTissue stresses caused by invasive tumour: a biomechanical model.
J R Soc Interface
January 2025
Department of Materials Science and Engineering, School of Engineering, Westlake University, Hangzhou, Zhejiang 310030, People's Republic of China.
Malignant tumorigenesis is a complex process involving growth, invasion and mechanical deformation of a cancerous tissue. In this paper, a biomechanical model is proposed to couple the mechanical and biological mechanisms governing invasive tumour development. As an example, this model is applied to investigate the spatio-temporal evolution of tissue stresses in an invasive tumour spheroid and its host tissue.
View Article and Find Full Text PDFWeakening Coulomb interactions in ionic liquid via hydrogen bonds enables ultrafast supercapacitors.
J Colloid Interface Sci
January 2025
Shanxi Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049 China. Electronic address:
The application of ionic liquid electrolytes in ultrafast supercapacitors to achieve wide electrochemical operating windows and high electrochemical stability is highly applauded. However, the strong Coulomb interaction between ions leads to the overscreening effect and slow establishment process of the electrical double layer (EDL), which deteriorates the rate performance of supercapacitors. Herein, inspired by Coulomb's law and EDL transient dynamics, we introduce competitive hydrogen bond interactions into typical ionic-liquid electrolytes to weaken the Coulomb interaction between ions.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!