Rabbit common calcanean tendon as an animal model: ultrasonographic anatomy and morphometry

Background: The aim of the present study was to evaluate usefulness of ultrasonography in assessment of rabbit common calcanean tendon, to describe its ultrasonographic anatomy and to perform morphometric analysis of this structure.   Materials and methods: Fifteen skeletally-matured New Zealand rabbits were used in the study. Ultrasonographic examinations of common calcanean tendon (CCT) were performed in longitudinal and transverse planes from caudal approach. Sagittal diameters of superficial digital flexor tendon and CCT were measured on longitudinal scans. Sagittal and transverse diameter, cross-sectional area and perimeter of the CCT were assessed on transverse scans. Statistical analysis was performed using StatisticaPL software (StatSoft®, Poland).   Results: In longitudinal images structure of CCT was clearly visualised. Its superficial hypoechoic part corresponds to superficial digital flexor tendon and deeper hyperechoic to gastrocnemius tendon. In transverse images cross-sectional area presented varied echotexture. Proximally, CCT was rounded in transverse section and became slightly wider and flattered distally. Statistical analysis showed no differences between results obtained from right and left hindlimb (p > 0.05). Measurements of sagittal diameter of CCT obtained in transverse planes were significantly higher than sagittal diameter measurements obtained in longitudinal plane in corresponding locations (p < 0.001). All performed measurements showed a growing trend with the increasing distance from the calcaneal tuber.   Conclusions: Ultrasonography is suitable technique for assessment of CCT in a rabbit model and provides satisfactory images for morphometrical evaluation.

The influence of breed, age, gender, training level and ambient temperature on forelimb and back temperature in racehorses

Abstract A previous thermographic study of racehorses identified thirteen regions of interest (ROIs) for monitoring the impact of training. However, that investigation did not consider the influence of breed, age, gender, or training intensity level on the temperature of ROIs. The present study adopted a multivariate analysis approach to determine whether the aforementioned factors, along with ambient temperature, significantly influenced ROI temperature in the key body regions. Thermography measurements were obtained from 53 racehorses of three breeds. Horses were in regular training for over ten months, having 13 thermographic examinations in each racing season. Backward stepwise multiple linear regression indicated that ambient temperature and breed contributed significantly to the model for predicting ROI temperature at all 13 ROIs. Training intensity level contributed significantly to the model only at the thoracic vertebrae, the left third metacarpal bone, and left fetlock joint. Neither gender nor age contributed to the model significantly at any ROI. Our data suggest that ambient temperature, breed and training level affect racehorse body surface temperature in some areas of the distal parts of the forelimbs and the back. This contributes to a better understanding of the normal range of thermographic findings in racehorses undergoing intensive training

Anatomical and Biomechanical Aspects of the Horse Spine: The Interpretation of Vertebral Fusion in a Medieval Horse from Wroclaw (Poland)

The investigation were carried out on the medieval horses thoracic and lumbar spine excavated between 2009-2011 by the Institute of Archaeology, University of Wroclaw at New Market Square in Wroclaw (Wratislavia, Breslau), capital city of the Polish province of Lower Silesia. The pathological changes, like: ankylosis of the zygapophyses, fusion of the vertebral bodies and arches and the interspinal space calcification were observed. The X-ray examination was done. During medieval artefact interpretation the biomechanical aspect of horse's locomotor system was taken into consideration. The archaeozoological material was compared with modern horse's spine (with similar pathological changes and known history of disease). The analysis proved, that the observed osseous reaction was a result of the long-lasting inflammation. Such a disease appearance accompanies chronic inflammatory state of errector muscles of the spine. It is typical for those horses utilised for the saddle. Copyright (c) 2012 John Wiley & Sons, Ltd