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Purpose Properly planned road illumination systems are collectively a public wealth and the commissioning of such systems may require extensive planning, simulation and testing. The purpose of this simulative work is to offer a simple approach to facilitate luminance-based road lighting calculations that can be easier to comprehend and apply to practical designing problems when compared to complex multi-objective algorithms and other convoluted simulative techniques. Design/methodology/approach Road illumination systems were photometrically simulated with a created model in a validated software platform for specified system design configurations involving high-pressure sodium (HPS) and light-emitting diode (LED) luminaires. Multiple regression analyses were conducted with the simulatively obtained data set to propound a linear model of estimating average luminance, overall uniformity of luminance and energy efficiency of lighting installations, and the simulatively obtained data set was used to explore luminaire power–road surface average luminance characteristics for common geometric design configurations involving HPS and LED luminaires, and four categories of road surfaces. Findings The six linear equations of the propounded linear model were found to be well-fitted with their corresponding observation sets. Moreover, it was found that the luminaire power–road surface average luminance characteristics were well-fitted with linear trendlines and the increment in road surface average luminance level per watt increment of luminaire power was marginally higher for LEDs. Originality/value This neoteric approach of estimating road surface luminance parameters and energy efficiency of lighting installations, and the compendia of luminaire power–road surface average luminance characteristics offer new insights that can prove to be very useful for practical purposes.

The extensor tendon system of the hand includes the forearm-based extrinsic extensors that power wrist and finger extension as well as the hand-based intrinsic extensors that stabilize the digits in extension. The anatomy and interaction of these tendons are described with reference to the topographic classification system of Verdan’s zones. The injuries of the extensors can be either closed or open and the treatment is injury and site specific. The approaches to the individual injuries and treatment are described.

It has been estimated that approximately 15000 to 20000 hours are required to train a surgeon.1 However, several time-constrains imposed globally2 have significantly reduced training time in the Operating Room (OR) posing a significant challenge for surgical educators and creating an impetus for the development of new educational methods.3 Since August 2005, all medical graduates in the United Kingdom must enter a 2 year postgraduate programme prior to commencing training in their chosen medical or surgical specialty.4 What is the problem? Despite this two-year programme being a good introduction to duties as a doctor there have been some concerns that the trainees do not gain significant experience in surgical procedures leading to reduced confidence.5 Which can make transition from a second year postgraduate (Foundation) doctor (PGY2) to a surgical resident particular difficult. To gain more experience a large number of doctors undertaking additional posts, which are not part of the recognised training scheme, in the UK and abroad, or roles such as anatomy demonstrators, in order to broaden their skills and relevant knowledge prior to progressing to surgical training.6