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   42292篇
  免费   2402篇
  国内免费   1682篇
耳鼻咽喉   159篇
儿科学   157篇
妇产科学   65篇
基础医学   2474篇
口腔科学   2055篇
临床医学   3913篇
内科学   1424篇
皮肤病学   32篇
神经病学   819篇
特种医学   2625篇
外国民族医学   2篇
外科学   18276篇
综合类   7788篇
现状与发展   1篇
预防医学   1319篇
眼科学   202篇
药学   2480篇
  65篇
中国医学   2221篇
肿瘤学   299篇
  2024年   184篇
  2023年   738篇
  2022年   1440篇
  2021年   1822篇
  2020年   1781篇
  2019年   1306篇
  2018年   1224篇
  2017年   1383篇
  2016年   1577篇
  2015年   1502篇
  2014年   3289篇
  2013年   3040篇
  2012年   2929篇
  2011年   3134篇
  2010年   2700篇
  2009年   2437篇
  2008年   2111篇
  2007年   2204篇
  2006年   1899篇
  2005年   1727篇
  2004年   1448篇
  2003年   1195篇
  2002年   915篇
  2001年   785篇
  2000年   558篇
  1999年   574篇
  1998年   403篇
  1997年   384篇
  1996年   268篇
  1995年   237篇
  1994年   189篇
  1993年   175篇
  1992年   125篇
  1991年   87篇
  1990年   59篇
  1989年   59篇
  1988年   55篇
  1987年   55篇
  1986年   50篇
  1985年   42篇
  1984年   31篇
  1983年   39篇
  1982年   48篇
  1981年   36篇
  1980年   24篇
  1979年   29篇
  1978年   21篇
  1977年   14篇
  1976年   16篇
  1975年   16篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
目的:探讨老年人桡骨远端C型骨折的手术治疗与非手术治疗的疗效差异,评价两种方法的优缺点。方法回顾性分析2009-12—2011-12收治的老年桡骨远端C型骨折68例,按照治疗方法分为A组(手术组)及B组(非手术组),统计分析两组患者的临床资料。结果 A组33例, B组35例,平均随访21.5个月。两组患者的年龄、骨折类型均无差异(P>0.05);术后影像学指标A组优于B组,骨折愈合时间B组优于A组,治疗成本A组大于B组(P<0.05);Cooney评分早期A组优于B组,1年后两组无差异,两组的并发症无差异(P>0.05)。结论老年人桡骨远端C型骨折手术治疗较非手术治疗可获得更好的复位及早期功能,但远期功能恢复无差异。  相似文献   
4.
5.
6.
目的 探讨复杂跟骨骨折治疗方法及AO钢板内固定价值.方法 应用AO钢板治疗累及距下关节的跟骨骨折24例,术中注意关节面复位和Bohler角的恢复.结果 24例病人经12~24个月随访,按照Fernandez评定标准:24例跟骨SandersⅡ-Ⅳ型骨折病人有18足评为优良.结论 距下关节面的复位和Bohler角的恢复,牢固的内固定和术后足够长时间的负重限制是成功的关键.  相似文献   
7.
The results of lumbar fusion in chronic low back pain (LBP) patients vary considerably, and there is a need for proper patient selection. Lumbosacral orthoses have been widely used to predict outcome, however, with little scientific support. The aim of the present study was to determine the value of a pantaloon cast test in selecting chronic LBP patients for lumbar fusion or conservative management. First, a systematic review of the literature was carried out in which two independent reviewers identified studies in Medline, Cochrane and Current Contents databases. Three papers met the selection criteria. In the only study with a control group, a significantly better outcome after fusion compared to conservative treatment was found in patients who reported significant pain relief while in a cast (i.e. a positive cast test). The results of lumbar fusion, however, were not significantly different for patients with a positive and those with a negative cast test. In addition to the review, a clinical cohort study of 257 LBP patients, who had been allocated to either lumbar fusion or conservative management by a temporary external transpedicular fixation trial, was performed. Prior to allocation, all had undergone a pantaloon cast test. Patients with no history of prior spine surgery and with a positive pantaloon cast test had a better outcome after lumbar fusion than those treated conservatively (P = 0.002, χ 2 test). In patients with previous spine operations the outcomes were poor and the test was of no value. From the literature and the present patient cohort, it was concluded that only in chronic LBP patients without prior spine surgery, a pantaloon cast test with substantial pain relief suggests a favorable outcome of lumbar fusion compared to conservative management. The test has no value in patients who have had previous spine surgery.  相似文献   
8.
9.
Introduction The associations between vitamin D receptor (VDR) Bsm I and Fok I genotypes, parity, and risk of osteoporotic hip fracture were evaluated in a statewide population-based case-control study in Utah.Methods Women age 50–89 years with hip fracture (n=882) were ascertained via surveillance of 18 Utah hospitals from 1997 to 2001. Age-matched controls were randomly selected (n=897). Participants were interviewed in their homes, and blood samples were collected for genotyping.Results In logistic regression analyses that controlled for multiple confounders, Bsm I VDR genotype but not Fok I genotype was associated with risk of osteoporotic hip fracture (OR bb vs. BB genotype: 0.68; 95% CI: 0.50, 0.95). In similar analyses, no overall association was observed between parity status and risk of osteoporotic hip fracture. However, the effect of VDR genotype was modified by parity status. Among nulliparous women (n=140), Bsm I genotype was not associated with risk of hip fracture (OR bb vs. BB: 0.82; 95% CI: 0.28, 2.4); among primiparous women (n=133), bb genotype was associated with increased risk of hip fracture (OR bb vs. BB: 3.30; 95% CI: 0.96, 11.29); among multiparous women (n=1,400), bb genotype was associated with decreased risk of hip fracture (OR bb vs. BB: 0.59; 95% CI: 0.42, 0.84).Conclusion VDR Bsm I genotype was associated with risk of hip fracture in Utah women, and this effect was modified by parity status. Hormonal or lifestyle factors related to parity may underlie this interaction.  相似文献   
10.
Sciatic nerve injury and dysfunction is not an uncommon cause of lower extremity symptoms in a musculoskeletal practice. We present the case of a man who presented with lower extremity weakness, pain, and cramps, and was initially diagnosed at an outside institution with bilateral S1 radiculopathies and recommended for spine surgery. He came to us for a second opinion. Electrodiagnostic testing revealed an isolated sciatic neuropathy and the patient was referred for imaging, which showed a sciatic nerve sheath tumor. Review of the literature on sciatic neuropathies shows that there can be many possible etiologies of sciatic nerve dysfunction, but that hip arthroplasty continues to be the leading risk factor. Sciatic nerve tumors are not commonly described in the literature and their definitive management remains unclear.  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