The effect of player positional groups on the nature of tackles that result in tackle-related injuries in professional rugby league matches

AIM

The aim of this study was to describe the effect of player positional groups on the nature of tackles that result in tackle-related injuries in professional rugby league matches.

METHODS

Prospective observational epidemiology analyses for tackle-related injuries and video analyses for the nature of tackles were conducted for a single team in the National Rugby League (NRL) throughout the 2007 and 2008 competitions for a total of 48 games. Risk ratios (RR) were calculated for comparisons between positional groups (adjustable, hit-up forwards or outside backs).

RESULTS

The total missed match tackle-related injury rate was 57.8 per 1 000 player hours. Hit-up forwards recorded significantly more total tackle-related injuries than outside backs (RR: 1.3; P=0.049), but not more than adjustables (RR: 1.0; P=0.922). Hit-up forwards recorded significantly more chest-back tackle-related injuries than adjustables (RR: 6.0; P=0.008). Outside backs recorded significantly more tackle injuries as the ball carrier than the tackler (RR: 2.4; P=0.015) while adjustables recorded significantly more tackle injuries as the tackler than the ball carrier (RR: 1.8; P<0.001). Hit-up forwards had a higher incidence of contusions, and sprains while adjustables had a higher incidence of fracture/dislocations. There were no differences in injury severity between the positional groups.

CONCLUSION

Player positional group had an effect on tackle-related injury type and injury site. Hit-up forwards and outside backs recorded more tackle-related injuries as a ball carrier than as a tackler, while in contrast, adjustables recorded more tackle-related injuries as the tackler than the ball carrier.

Future tools for association mapping in crop plants

Association mapping currently relies on the identification of genetic markers. Several technologies have been adopted for genetic marker analysis, with single nucleotide polymorphisms (SNPs) being the most popular where a reasonable quantity of genome sequence data are available. We describe several tools we have developed for the discovery, annotation, and visualization of molecular markers for association mapping. These include autoSNPdb for SNP discovery from assembled sequence data; TAGdb for the identification of gene specific paired read Illumina GAII data; CMap3D for the comparison of mapped genetic and physical markers; and BAC and Gene Annotator for the online annotation of genes and genomic sequences.

A retrospective review over 1999 to 2007 of head, shoulder and knee soft tissue and fracture dislocation injuries and associated costs for rugby league in New Zealand

King et al. reported that of 5 941 moderate to serious claims resulting in medical treatment for rugby league injuries, the knee, shoulder, and head and neck body sites and soft tissue and fracture-dislocation injuries were most frequent and costly in the New Zealand national no-fault injury compensation corporation database during 1999 to 2007. However, additional analyses of knee, shoulder and head and neck body sites by soft tissue and fracture-dislocation injury types was required to enable a greater understanding of the nature of injuries most likely to be seen by sports medical personnel dealing with rugby league players. From 1999 to 2007 the injury claims and costs for head and neck soft tissue, fracture-dislocations, shoulders soft tissue significantly increased. Knee soft tissue injury claims and costs significantly decreased from 1999 to 2007. There was no significant difference in knee fracture-dislocation injury claims but there was a significant increase in knee fracture-dislocation injury costs from 1999 to 2007. Changes in the nature of injuries may be related to changes in defensive techniques employed in rugby league during this time. Sports medical personnel dealing with rugby league players should focus their injury prevention strategies on reducing musculoskeletal injuries to the head and shoulder. There should be a focus on increasing awareness of correct tackling technique, head injury awareness and management of suspected cervical spine injuries.

A patient and relative centred evaluation of treatment escalation plans: a replacement for the do-not-resuscitate process

The Treatment Escalation Plan (TEP) was introduced into our trust in an attempt to improve patient involvement and experience of their treatment in hospital and to embrace and clarify a wider remit of treatment options than the Do Not Resuscitate (DNR) order currently offers. Our experience suggests that the patient and family are rarely engaged in DNR discussions. This is acutely relevant considering that the Mental Capacity Act (MCA) now obliges these discussions to take place. The TEP is a form that the doctor completes, ideally with the competent patient or close relative, documenting what treatment options would be appropriate if that patient were to become acutely unwell. Ventilation of the lungs, cardiac resuscitation, renal replacement therapy, intravenous fluids and antibiotics are all discussed. The study evaluated patient and relative experiences with the TEP. 55 patients or their relatives were interviewed regarding their experience of the TEP and thoughts regarding the process. 96% of patients and relatives evaluated thought that the TEP was a good idea. Free text comments were all positive and only 34% of patients claimed to feel anxious when completing the form. Following this study, the TEP has been expanded hospital wide and into the community within our trust. Discussions are currently taking place in hospitals within our region to introduce the TEP form into other local trusts.

Targeted identification of genomic regions using TAGdb

BACKGROUND

The introduction of second generation sequencing technology has enabled the cost effective sequencing of genomes and the identification of large numbers of genes and gene promoters. However, the assembly of DNA sequences to create a representation of the complete genome sequence remains costly, especially for the larger and more complex plant genomes.

RESULTS

We have developed an online database, TAGdb, that enables researchers to identify paired read sequences that share identity with a submitted query sequence. These tags can be used to design oligonucleotide primers for the PCR amplification of the region in the target genome.

CONCLUSIONS

The ability to produce large numbers of paired read genome tags using second generation sequencing provides a cost effective method for the identification of genes and promoters in large, complex or orphan species without the need for whole genome assembly.

AutoSNPdb: an annotated single nucleotide polymorphism database for crop plants

Single nucleotide polymorphisms (SNPs) may be considered the ultimate genetic marker as they represent the finest resolution of a DNA sequence (a single nucleotide), are generally abundant in populations and have a low mutation rate. Analysis of assembled EST sequence data provides a cost-effective means to identify large numbers of SNPs associated with functional genes. We have developed an integrated SNP discovery pipeline, which identifies SNPs from assembled EST sequences. The results are maintained in a custom relational database along with EST source and annotation information. The current database hosts data for the important crops rice, barley and Brassica. Users may rapidly identify polymorphic sequences of interest through BLAST sequence comparison, keyword searches of annotations derived from UniRef90 and GenBank comparisons, GO annotations or in genes corresponding to syntenic regions of reference genomes. In addition, SNPs between specific varieties may be identified for targeted mapping and association studies. SNPs are viewed using a user-friendly graphical interface. The database is freely accessible at http://autosnpdb.qfab.org.au/.

Velocity-dependent fatigue crack paths in nanograined Pt films

Studies of crack growth in nanograined films assert that mechanical damage accumulates at grain boundaries irrespective of the crack velocity and loading conditions. This work shows that crack advance in nanograined Pt films involves a dislocation-slip mechanism that is a function of the crack growth rate and mode of loading. Crack paths in Pt were initially intergranular, but transitioned to a transgranular mode that persisted until catastrophic failure. This research demonstrates that crack growth mechanisms modeled for nanograined Ni cannot be generalized to other pure, metallic systems.

QSAR studies using the parashift system

A novel way of describing molecules in terms of their surfaces and local properties at the surfaces is described. The use of these surfaces and properties to explain chemical reactivity and model simple molecular properties has already been demonstrated. This study reports an examination of the use of these descriptions of molecules to model a simple chemical interaction (complex formation) and a diverse set of mutagens. Both of these systems have been modelled successfully and the results are discussed.

Gene conversion in the rice genome

Background

Gene conversion causes a non-reciprocal transfer of genetic information between similar sequences. Gene conversion can both homogenize genes and recruit point mutations thereby shaping the evolution of multigene families. In the rice genome, the large number of duplicated genes increases opportunities for gene conversion.

Results

To characterize gene conversion in rice, we have defined 626 multigene families in which 377 gene conversions were detected using the GENECONV program. Over 60% of the conversions we detected were between chromosomes. We found that the inter-chromosomal conversions distributed between chromosome 1 and 5, 2 and 6, and 3 and 5 are more frequent than genome average (Z-test, P < 0.05). The frequencies of gene conversion on the same chromosome decreased with the physical distance between gene conversion partners. Ka/Ks analysis indicates that gene conversion is not tightly linked to natural selection in the rice genome. To assess the contribution of segmental duplication on gene conversion statistics, we determined locations of conversion partners with respect to inter-chromosomal segment duplication. The number of conversions associated with segmentation is less than ten percent. Pseudogenes in the rice genome with low similarity to Arabidopsis genes showed greater likelihood for gene conversion than those with high similarity to Arabidopsis genes. Functional annotations suggest that at least 14 multigene families related to disease or bacteria resistance were involved in conversion events.

Conclusion

The evolution of gene families in the rice genome may have been accelerated by conversion with pseudogenes. Our analysis suggests a possible role for gene conversion in the evolution of pathogen-response genes.

Bioinformatics process management: information flow via a computational journal

This paper presents the Bioinformatics Computational Journal (BCJ), a framework for conducting and managing computational experiments in bioinformatics and computational biology. These experiments often involve series of computations, data searches, filters, and annotations which can benefit from a structured environment. Systems to manage computational experiments exist, ranging from libraries with standard data models to elaborate schemes to chain together input and output between applications. Yet, although such frameworks are available, their use is not widespread-ad hoc scripts are often required to bind applications together. The BCJ explores another solution to this problem through a computer based environment suitable for on-site use, which builds on the traditional laboratory notebook paradigm. It provides an intuitive, extensible paradigm designed for expressive composition of applications. Extensive features facilitate sharing data, computational methods, and entire experiments. By focusing on the bioinformatics and computational biology domain, the scope of the computational framework was narrowed, permitting us to implement a capable set of features for this domain. This report discusses the features determined critical by our system and other projects, along with design issues. We illustrate the use of our implementation of the BCJ on two domain-specific examples.

Palliative radiotherapy improves pain and reduces functional interference in patients with painful bone metastases: a quality assurance study

AIMS

To characterise the effect of palliative radiotherapy treatment outcomes as evaluated by the Brief Pain Inventory within a radiotherapy clinic, as a quality assurance initiative.

MATERIALS AND METHODS

Tumour and treatment parameters of patients with painful bone metastases treated through a dedicated bone pain radiotherapy clinic have been prospectively recorded since 2002. One hundred and nine ambulatory patients provided pre- and post-treatment pain assessments at 4-6 weeks after palliative radiotherapy. The self-administered Brief Pain Inventory questionnaire was completed by patients during their visits. Changes in pain and seven-item functional interference scores were analysed.

RESULTS

Most of the patients had prostate (n=42) or breast (n=42) cancer. The mean Karnofsky performance score was 70 before palliative radiation therapy. Sixty-eight per cent of patients were treated with a single fraction (6-8 Gy) and 25% received 20 Gy/five fractions. The overall response (reduction in worst pain by > or = 2/10) was 72%. Sixty-one per cent of patients had stable or reduced consumption of opioid analgesics. A significant reduction for all seven functional interference items was seen after treatment, the greatest improvement being general activity (-2.4/10). There was significant correlation between pain reduction and improvement in functional interference.

CONCLUSION

This quality assurance initiative showed that palliative radiotherapy reduced both pain and its interference on function among ambulatory patients with symptomatic bone metastases. The reduction in pain was correlated with reductions in functional interference. Clinical trials of palliative radiotherapy should provide data that allow an evaluation of various domains of chronic pain.