The huddle-technique app - a new instrument imaging knee-instability of young high performance football players. Comparison of measured angles, KT1000, KLT and subjektiv instability.

Aims and Objectives:Is there a correlation between measured frontal plane projection angle, KT1000, KLT and subjektiv instability recognized by player or examiner in a cohort of 101 young high performance football players. We want to establish a reproducible tool that recognizes knee instability in a dynamic movement to prevent knee injury in young high performance athletes.Materials and Methods:Rupture of anterior cruciate ligament (ACL) is a serious knee injury. Several epidemiological studies have shown a correlation between coordination, neuromuscular control and incidence of ACL injuries. In a prospective study of 101 young high performance football players we measured the frontal plane projection angle (FPPA) in drop test with the huddle-technique app. Furthermore we captured subjektiv instability in drop test, single hop test and figure of eight test as well as basic instability criteria as lachmann test, pivot shift test, KT 1000 and KLT.Results:Low FFPA angles (valgus knee) in drop test correlate...