Fourcepoint ™ Hinge Research
ACL (GRAFT) PROTECTION Reducing the risk of ACL reinjury to the reconstructed knee
FourcePoint hinge decreases posterior ground reaction forces 24,25,26
FourcePoint hinge increases knee flexion angles 23,24,25,26
FOURCEPOINT STUDY : KNEE FLEXION ANGLE AT LANDING
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The patellar tendon-tibial shaft (PTTS) angle is the angle between the patellar tendon and the longitudinal axis of the tibia and is a linear function of knee flexion. 27
PGRF generates a knee flexion moment that must be resisted by a knee extension moment generated by the quadriceps muscles through the patellar tendon. 24
No Brace With Brace
Male
Female
Increasing the knee flexion angle decreases the PTTS angle. Decreasing PTTS angle decreases the quadriceps and patellar tendon forces. 24,27
Decreasing the PGRF decreases the required internal knee extension moment, thus decreasing the quadriceps and patellar tendon forces. 24
Wearing a fourcepoint brace significantly increased knee flexion angle at landing in a stop-jump task with an average of 5.1° in males and 5.3° in females.
* Significant: p = 0.001
Reducing the anterior shear forces applied on the tibia by the quadriceps & patellar tendon decreases ACL (graft) loading
FourcePoint hinge protects patients after ACL reconstruction from excessive ACL loading and reduces the reinjury risk
Using a brace with FourcePoint ™ hinge technology in conjunction with a 4-Point-of-Leverage ™ frame design:
• Significantly increases knee flexion angle by up to 9° at landing in a stop-jump task in healthy subjects 23,25,26 and at initial foot contact during walking, jogging and stair descent in ACL reconstructed patients 24 , when compared to standard braced and non-braced condition. • Significantly reduces the anterior shear force applied on the tibia during landing in a stop-jump task, by an average of 9% for females and 13% for males. 23 • Significantly decreases peak posterior ground reaction force (PPGRF) during walking, stop jump task landing and side-cutting activities 24,25,26 • Does not impede performance 23,25
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