"Triple-Fix" Arthroscopic Biceps Tenodesis: Indications and Technique.

Pathology of the long head of the bicep tendon is a common cause of anterior shoulder pain and frequently is treated surgically using either tenodesis or tenotomy. Tenodesis often is the preferred technique for younger, more active patients and laborers, especially when cosmesis and preservation of function are clinical priorities. However, the security of the tenodesis varies with fixation methods and techniques, and failure of the tenodesis can have both cosmetic and symptomatic consequences. Traditional arthroscopic tenodesis also can be technically challenging, as it usually requires extra-articular identification of the bicep tendon within the bicipital groove. The arthroscopic surgical technique described is an approach that has been routinely employed by the senior author for approximately 8 years that allows for accurate and reproducible exposure of the biceps tendon within the bicipital groove along with secure, anatomic tenodesis of the long head of the bicep tendon.

Arthroscopically Assisted Humeral Head Decompression for Avascular Necrosis: Lateral Cortical Perforation Technique.

Avascular necrosis (AVN) of the humeral head is debilitating condition that, when left untreated, can progress to humeral head collapse and end-stage arthritis of the glenohumeral joint. Core decompression is widely regarded as a first-line surgical treatment for early-stage AVN, and when performed on the appropriate patient, core decompression is an effective treatment for improving symptoms and preventing progression and humeral head collapse. This article discusses operative indications and presents a relatively simple and effective arthroscopic method for core decompression of humeral head avascular necrosis.

Bradford's law: identification of the core journals for neurosurgery and its subspecialties.

OBJECTIVE: Bradford's law describes the scatter of citations for a given subject or field. It can be used to identify the most highly cited journals for a field or subject. The objective of this study was to use currently accepted formulations of Bradford's law to identify core journals of neurosurgery and neurosurgical subspecialties. METHODS: All original research publications from 2009 to 2013 were analyzed for the top 25 North American academic neurosurgeons from each subspecialty. The top 25 were chosen from a ranked career h-index list identified from previous studies. Egghe's formulation and the verbal formulation of Bradford's law were applied to create specific citation density zones and identify the core journals for each subspecialty. The databases were then combined to identify the core journals for all of academic neurosurgery. RESULTS: Using Bradford's verbal law with 4 zone models, the authors were able to identify the core journals of neurosurgery and its subspecialties. The journals found in the most highly cited first zone are presented here as the core journals. For neurosurgery as a whole, the core included the following journals: Journal of Neurosurgery, Neurosurgery, Spine, Stroke, Neurology, American Journal of Neuroradiology, International Journal of Radiation Oncology Biology Physics, and New England Journal of Medicine. The core journals for each subspecialty are presented in the manuscript. CONCLUSIONS: Bradford's law can be used to identify the core journals of neurosurgery and its subspecialties. The core journals vary for each neurosurgical subspecialty, but Journal of Neurosurgery and Neurosurgery are among the core journals for each neurosurgical subspecialty.

Image-guided convection-enhanced delivery into agarose gel models of the brain.

Convection-enhanced delivery (CED) has been proposed as a treatment option for a wide range of neurological diseases. Neuroinfusion catheter CED allows for positive pressure bulk flow to deliver greater quantities of therapeutics to an intracranial target than traditional drug delivery methods. The clinical utility of real time MRI guided CED (rCED) lies in the ability to accurately target, monitor therapy, and identify complications. With training, rCED is efficient and complications may be minimized. The agarose gel model of the brain provides an accessible tool for CED testing, research, and training. Simulated brain rCED allows practice of the mock surgery while also providing visual feedback of the infusion. Analysis of infusion allows for calculation of the distribution fraction (Vd/Vi) allowing the trainee to verify the similarity of the model as compared to human brain tissue. This article describes our agarose gel brain phantom and outlines important metrics during a CED infusion and analysis protocols while addressing common pitfalls faced during CED infusion for the treatment of neurological disease.