The Science of Knee Protection: Polycentric Kinematics, ACL Defense & Carbon Exoskeletons
The human knee is not a simple hinge—it performs a simultaneous roll-and-glide motion. When an off-road rider hooks a foot in a deep rut while under throttle, the knee is subjected to violent hyperextension and internal rotation that snaps the Anterior Cruciate Ligament (ACL). Discover how geared 4-point polycentric hinges mirror true anatomy, how carbon fiber frames transfer torsional loads to the femur, and why soft knee pads cannot prevent ligament tears.
Hyperextension Lockout
0° - 20° Stops
Interchangeable stops arresting extension before ACL tears
Carbon Frame Modulus
> 120 GPa
Rigid torsional load transfer directly into femur and tibia
Patella Impact Defense
< 15.0 kN
CE EN 1621-1 Level 2 certified floating patella shield
Kinematic Hinge Type
Polycentric 4-Pt
Continuous tracking of natural femoral roll-and-glide
Interactive Mechanical Dissection
The 5 Critical Systems of an Articulated Carbon Knee Brace
Orthopedic Kinematics • Zone 1 ActiveTracks moving Instantaneous Center of Rotation (ICR)
ZONE 1Replicating Femoral Roll-and-Glide Kinematics
Polycentric 4-Point Geared Hinge
Material Chemistry
CNC-Machined 7075-T6 Billet Aluminum Geared Plates with Stainless Pivot Pins
Biomechanical Function
Unlike a simple single-pivot hinge, the polycentric geared mechanism continuously shifts its pivot axis to match the human femur's simultaneous rolling and sliding over the tibial plateau, preventing brace slippage and joint pinching.
Kinematic RatingTracks moving Instantaneous Center of Rotation (ICR)
Biomechanical Simulator
Hyperextension Mechanics: Extension Angle vs. ACL Tensile Strain
Analyze what occurs when a boot hooks in a rut and drives the leg past 0° into hyperextension. The Anterior Cruciate Ligament (ACL) tears at > 8% elongation strain. See how the rigid carbon frame and lockout stops prevent the knee from exceeding 0°.
Applied Knee Hyperextension Angle
10° Past Straight (Effective Knee Joint Angle: 0°)
Continuous carbon fiber filaments pre-impregnated with toughened epoxy resin and cured in pressurized autoclaves. Offers the highest stiffness-to-weight ratio available, creating a structural exoskeleton that will not deflect under high rotational twist.
Flexural Rigidity
Flexural Modulus: 135 GPa
Mass Density
1.55 g/cm³ (Ultra-Lightweight)
Thermal Stability
Stable to 250°C
Micro-Structure Matrix
Bidirectional 12K carbon yarn woven in high-density matrix to resist torsional shear.