Table 1.

Potential RTS Factors as Independent Variables for Model-Building

Potential Pool of Independent Variables
Clinical measures at RTS:  •  QF strength (isometric and isokinetic;   LSI; involved limb peak torque)  •  HS strength (isometric and isokinetic;   LSI; involved limb peak torque)  •  Hip abduction strength (LSI; involved limb peak torque)  •  Involved knee ROM (flexion,extension)  •  Involved knee effusion (0,1)  •  Involved knee laxity (involved knee,30 pounds)	Potential demographic and surgical covariates:  •  Age at RTS  •  Gender (0,1)  •  Meniscus injury (0,1)  •  ACLR graft type (dummy coded)  •  BMI  •  Time from ACLR to RTS (time in rehab)  •  Pediatric ACLR modification (0,1)  •  Pre-injury activity level

QF – quadriceps femoris; LSI – limb symmetry index; HS – hamstring; ROM – range of motion; ACLR – anterior cruciate ligament reconstruction; BMI – body mass index