Tackling the tackle 1: A descriptive analysis of 14,679 tackles and risk factors for high tackles in a community-level male amateur rugby union competition during a lowered tackle height law variation trial

Objectives: In rugby union (rugby), the tackle is the most frequent cause of concussion and thus a target for intervention to reduce concussion incidence. The aim of this study is to describe tackle characteristics and factors associated with illegal high tackles in amateur community-level rugby during a lowered (armpit level) tackle height law variation trial. Design: Prospective observational cohort study. Methods: Video surveillance of a single season, four-league competition with coding of video data according to a predefined coding framework. Descriptive statistics of tackle detail and logistic regression was performed to analyse factors associated with high tackles. Results: One hundred and eight matches with 14,679 tackles and a mean of 137 (± 30) tackles per match were analysed. High tackles (above armpit level) had significantly greater odds of occurring in the lower (2nd–4th) leagues (OR: 1.95; 95 % CI: 1.6–2.4; p < 0.001), front-on tackles (OR: 1.61; 95 % CI: 1.3–2.0; p < 0.001), arm tackles (OR: 1.65; 95 % CI: 1.3–2.1; p < 0.001), bent-at-waist ball carrier (OR: 1.93; 95 % CI: 1.6–2.4; p < 0.001), falling/diving ball carrier (OR: 2.21; 95 % CI: 1.6–3.1; p < 0.001), and an upright tackler (OR: 3.38; 95 % CI: 2.7–4.2; p < 0.001). A falling/diving tackler had significantly lower odds of being associated with a high tackle (OR: 0.44; 95 % CI: 0.3–0.6; p < 0.001). Conclusions: Overall mean tackles per match were similar to those of senior amateur and elite rugby. League, tackle type, tackle aspect, and player body positions were associated with high tackles. These findings reiterate the need for ongoing efforts to identify and implement mitigating strategies to reduce tackle-related injury risk.