Protect.4 Evo Knee Brace

Functional Four-Point Knee Brace for ACL/PCL Instability, Ligament Injuries, and Active Return to Sport

When the knee has real ligament involvement — an ACL or PCL tear, multi-ligament instability, or complex injury — a soft brace isn't the answer. The Protect.4 Evo applies the four-point leverage principle: the frame pushes on four points around the knee joint to control anterior and posterior tibial translation, rotational instability, and the varus/valgus forces that ligament-deficient knees can't manage on their own. Adjustable flexion and extension stops, numbered straps for consistent fitting, and a polycentric hinge that tracks with the knee.

Product Details

Support Level: Maximum

Best For:

•       ACL and PCL ligament ruptures — conservative management or post-surgical protection

•       Collateral ligament ruptures with combined instability

•       Complex multi-ligament knee injuries requiring maximum structural control

•       Conservative management of knee instability where surgery is deferred or declined

•       Return to sport after knee ligament reconstruction

Why the Protect.4 Evo Knee Brace Works

Four-Point Leverage — Structural Knee Control

The brace frame creates four contact points around the joint — two above and two below — using the mechanical leverage between them to resist the abnormal tibial translation that occurs when the ACL or PCL is torn. This is the same engineering principle used in custom functional knee orthoses, applied in a prefabricated format.

Adjustable Extension and Flexion Stops

Extension can be limited at 0°, 10°, 20°, 30°, and 45°. Flexion can be set from 0° through 90° in 10–15° increments — covering the full spectrum of post-surgical ROM protocols from initial immobilization through advanced return to sport.

Numbered Straps for Consistent, Error-Free Application

Each strap is numbered in the sequence it should be applied — eliminating inconsistent fitting that reduces brace effectiveness when patients self-apply. Correct, consistent application means consistent mechanical control.

Polycentric Hinge Tracks the Knee's Natural Arc

The polycentric hinge replicates the natural rolling-and-gliding motion of the tibiofemoral joint through the full arc of flexion and extension — preventing the binding and pressure that single-axis hinges create at end range during sport and rehabilitation.

Built for Your Active Life

Ideal activities while wearing:

•       Sport and athletic activity following ACL or ligament reconstruction clearance

•       Return to golf, pickleball, tennis, and recreational sport after knee ligament injury

•       High-demand physical work — construction, landscaping, active occupations

•       Hiking, trail use, and outdoor activity with an unstable or reconstructed knee

•       Any activity where your surgeon has cleared you but knee protection remains important

The Protect.4 Evo provides maximum off-the-shelf functional knee bracing. It is not a substitute for a custom functional brace in severe or complex instability cases. Work with your orthopedic surgeon or orthotist to confirm this brace is appropriate for your specific injury and activity level.

Is the Protect.4 Evo Knee Brace Right for You?

This might be the right brace for you if:

•       You have ACL, PCL, or complex ligament instability that requires maximum structural support

•       Your surgeon prescribed a functional hinged knee brace for post-surgical return to activity

•       You're managing ligament instability conservatively and need the strongest off-the-shelf option

•       You've returned to sport or high-demand activity after knee injury and need reliable protection

Consult your healthcare provider for personalized guidance.