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Association between the Functional Movement Screen and Noncontact Lower Extremity Injury in Collegiate Football Players: 3520 Board #281 May 30, 9

METHODS: Six (age= 27.4±1.3 years; weight= 58.9±7.8 kg; height= 1.6±0.1 m) healthy, experienced dancers with an average 22.6±2.1 years of dance training performed 5 saut de chat leaps; these leaps involve taking off from one leg, quickly rotating the legs in opposite directions toward a 180° split position in the air, and landing on the opposite leg. A three-dimensional motion analysis system and force plates were used to collect kinematic and kinetic data. Ground reaction force (GRF) impulse and sagittal plane kinematics and kinetics of the hip, knee, ankle, and metatarsophalangeal (MTP) joints were calculated for the takeoff and landing phases of each leap. GRF impulse and net joint moments were compared between takeoff and landing using paired t-tests. RESULTS: Saut de chat takeoffs demonstrated greater braking (posterior) GRF impulse (+.67 N/kg*s p=.002), while landings demonstrated greater vertical GRF impulse (+5.58 N/kg*s p=.038). During takeoff, greater kinetic demands were placed on the MTP (+.18 N/kg p=.038) and ankle (+.49 N/kg p=.004) joints, while during landing greater kinetic demands were placed on the knee (+.56 N/kg p=.04) and hip (+.81 N/kg p=.039) joints. CONCLUSIONS: Both takeoff and landing phases of saut de chat leaps place significant demands on a dancer’s body. Takeoff involves greater demands on the more distal joints and requires more braking forces, while the landing phase involves greater demands on the more proximal joints of the lower extremity and requires the dancer to absorb more vertical force. These demands, combined with extensive repetition of movements during training, may contribute to the high number of chronic injuries seen in dance.