between surface hardness and injury occurrence.
A non-significant trend was observed towards an increased risk of ACL injury on harder grounds in Australian Football, as well as an increased risk for injury in low/ normal hardness (30-69 g) and unacceptably high hardness (> 120 g) in community-level Australian football. Our within-field hardness levels varied from 39 to 123 g during months when injuries occurred. However, the observed proportion of ground-derived injuries that occurred in hot and cold spots was not different than the expected proportion, indicating there was not a higher or lower injury occurrence in areas of significantly high or low hardness values within the fields.
In this study, soil moisture hot spots and turfgrass quality cold spots suggests that further exploration is necessary to determine the impact of these field properties on ground- derived injuries. Our observed proportion of ground- derived injuries was significantly higher than the expected proportion in soil moisture hot spots and turfgrass quality cold spots, indicating there was a higher injury occurrence in these areas. Te observed and expected proportions for turfgrass shear strength were not different, indicating there was not a higher or lower injury occurrence within hot or cold spots of this field property. Te highest proportion of injuries occurred within a hot or cold spot of turfgrass quality (15/19; 79 percent), followed by soil
...And (b) a hot spot map (red and blue cells represent significantly high and low values within the field, respectively, and yellow cells are considered “average” values).
lower extremities (17/23; 74 percent), but some were to the upper extremities (4/23; 17 percent) and the head or face (2/23; 9 percent). Athletes returned to play the same day 65 percent (15/23) of the time and only 17 percent (4/23) sought medical attention after being injured. Te majority of athletes that reported an injury had experienced the same injury at some point prior to the study (14/23; 61 percent), and three of them suffered multiple injuries during the study.
Tere were no significant differences between observed and expected proportions with respect to surface hardness and turfgrass shear strength hot and/or cold spots. Other ground- related studies have primarily considered the causation of injury related to surface hardness and traction but did not consider within-field variations of individual fields. Tose studies provide minimal evidence of a significant relationship
TPI Turf News July/August 2018
The Turf-Tec Shear Strength Tester is used for measuring turfgrass shear strength.
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