首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   198504篇
  免费   22349篇
  国内免费   2456篇
耳鼻咽喉   5630篇
儿科学   6702篇
妇产科学   3295篇
基础医学   7585篇
口腔科学   1911篇
临床医学   32786篇
内科学   53625篇
皮肤病学   7775篇
神经病学   18487篇
特种医学   7076篇
外国民族医学   1篇
外科学   44036篇
综合类   589篇
现状与发展   72篇
一般理论   49篇
预防医学   12329篇
眼科学   3721篇
药学   3216篇
  1篇
中国医学   50篇
肿瘤学   14373篇
  2024年   865篇
  2023年   5372篇
  2022年   1876篇
  2021年   3914篇
  2020年   6574篇
  2019年   3090篇
  2018年   8398篇
  2017年   8038篇
  2016年   9140篇
  2015年   9193篇
  2014年   16623篇
  2013年   17490篇
  2012年   8287篇
  2011年   8490篇
  2010年   11878篇
  2009年   15597篇
  2008年   8402篇
  2007年   6646篇
  2006年   9043篇
  2005年   6301篇
  2004年   5364篇
  2003年   4076篇
  2002年   4077篇
  2001年   3981篇
  2000年   3158篇
  1999年   3432篇
  1998年   4029篇
  1997年   3756篇
  1996年   3585篇
  1995年   3388篇
  1994年   2139篇
  1993年   1755篇
  1992年   1491篇
  1991年   1506篇
  1990年   1134篇
  1989年   1263篇
  1988年   1094篇
  1987年   924篇
  1986年   959篇
  1985年   789篇
  1984年   638篇
  1983年   591篇
  1982年   600篇
  1981年   496篇
  1980年   428篇
  1979年   347篇
  1978年   359篇
  1977年   434篇
  1975年   300篇
  1972年   315篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
75.
76.
The effects of cervical bracing on swallowing function have not been evaluated in neurologically intact individuals. An 83-year-old woman fell, striking her head, and suffered C1, odontoid, and C3 fractures. She had no neurologic deficits and was placed in a Minerva brace. Subsequently, she developed coughing during her meals, a low-grade fever, and transient hoarseness, and complained of stiffness in the facial muscles. Aspiration pneumonia in the left lower lobe was diagnosed. In the absence of any neurologic condition, this was attributed to the Minerva brace. Less than 1 week later, the brace was replaced with a halo-vest, and the dysphagia resolved. This case shows that dysphagia and aspiration pneumonia may be caused by wearing a cervical brace and illustrates the importance of assessing swallowing in individuals who wear such braces. Particular attention should be paid to swallowing and cervical bracing in patients with additional risk factors for dysphagia such as advanced age or neurologic deficits.  相似文献   
77.
78.
79.
80.

Background

The trapeziometacarpal (TMC) joint’s unique anatomy and biomechanics render it susceptible to degeneration. For 60 years, treatment of the painful joint has been surgical when nonoperative modalities have failed. Dozens of different operations have been proposed, including total or subtotal resection of the trapezium or resection and implant arthroplasty. Proponents initially report high levels of patient satisfaction, but longer-term reports sometimes fail to support initial good results. To date, no one procedure has been shown to be superior to another.

Questions/purposes

This review sought to identify factors responsible for the development of many different procedures to treat the same pathology and factors influencing whether procedures remain in the armamentarium or are abandoned.

Methods

I performed a nonsystematic historical review of English-language surgical journals using the key words “carpometacarpal arthritis”, or “trapeziometacarpal arthritis”, and “surgery” in combination with “history” using the PubMed database. In addition, bibliographies of pertinent articles were reviewed.

Results

The factors that led to many surgical innovations appear to be primarily theoretical concerns about the shortcomings of previously described procedures, especially about proximal migration of the thumb metacarpal after trapezial resection. Longevity of a particular procedure seems to be related to simplicity of design, especially for prosthetic arthroplasty. The evolution of surgery for TMC joint arthritis both parallels and diverges from that in other joints. For example, for most degenerated joints (even many in the hand), treatment evolved from resection arthroplasty to implant arthroplasty. In contrast, for the TMC joint, the 60-year-old procedure of trapezial resection continues to be performed by a majority of surgeons; many modifications of that procedure have been offered, but none have shown better pain reduction or increased function over the original procedure. In parallel, many differently designed prosthetic total or hemijoint arthroplasties have been proposed and performed, again with as yet unconvincing evidence that this technology improves results over those obtained by simple resection arthroplasty.

Conclusions

Many procedures have been described to treat TMC joint arthritis, from simple trapezial resection to complex soft tissue arthroplasty to prosthetic arthroplasty. In the absence of evidence for the superiority of any one procedure, surgeons should consider using established procedures rather than adopting novel ones, though novel procedures can and should be tested in properly designed clinical trials. Tissue-engineered solutions are an important area of current research but have not yet reached the clinical trial stage.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号