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When your knee has real ligament involvement, a soft support won't provide the control you need. The medi Protect.4 Evo is a functional knee brace that applies a four-point leverage principle: the rigid aluminum frame pushes at four contact points around the knee to control anterior and posterior tibial translation, rotational instability, and varus/valgus forces that ligament-deficient knees can't manage alone.
Whether you're recovering from ACL reconstruction, managing PCL instability conservatively, or returning to sport after a complex ligament injury, the Protect.4 Evo delivers maximum off-the-shelf structural knee protection with adjustable ROM stops and a polycentric hinge that tracks your knee's natural arc.
Four-point aluminum frame creates a lever system that actively resists abnormal tibial movement in ACL/PCL-deficient knees
Adjustable flexion and extension stops cover the full spectrum of post-surgical ROM protocols, from immobilization through advanced sport clearance
Polycentric hinge replicates the natural rolling-and-gliding motion of the knee, preventing binding at end range
Numbered straps eliminate inconsistent fitting, ensuring the same reliable mechanical control every time you apply the brace
Lightweight construction supports extended wear during daily activities, physical therapy, and sports
Slide the brace into position with the hinge centered at your knee joint. Secure straps in numbered order, adjusting tension until the frame feels stable without excessive pressure. Your surgeon or physical therapist should set your initial flexion and extension limits. As your rehabilitation progresses, those limits can be advanced to match your protocol.
Frequently asked questions
FAQ 1: Can the Protect.4 Evo be used as a preventative knee brace during sports?
FAQ 2: What ligament injuries is the Protect.4 Evo indicated for?
FAQ 3: Does the Protect.4 Evo use a plastic or aluminum frame?
FAQ 4: How do I choose the right size?
Can the Protect.4 Evo be used as a preventative knee brace during sports?
Yes. The four-point aluminum frame provides preventative stabilization for athletes at elevated ACL, PCL, or collateral ligament injury risk. Confirm the fit with your healthcare provider before using it during high-intensity activity.
What ligament injuries is the Protect.4 Evo indicated for?
Indicated conditions include isolated or combined ACL and PCL ruptures, MCL/LCL collateral ligament tears with meniscus involvement, and conservative or post-operative management of combined knee instability.
Does the Protect.4 Evo use a plastic or aluminum frame?
The frame is rigid, lightweight aluminum, not hard plastic. Aluminum delivers shell-equivalent rigidity with less bulk, and the polycentric hinges replicate natural knee motion for comfort during extended wear.
How do I choose the right size?
Measure your thigh circumference at the point indicated in the sizing chart. Available in small through extra-large. Contact Doc Ortho's support team at (855) 363-0156 if you need help selecting the correct size and side.
Overall rating: 4.25 / 5 from 4 reviews.
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Review topics: ["brace"].
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Reviews
Warranty, broken brace after less than a week
"Is there a warranty on the brace's. My so hasnt even worn his for a week and it broke already."
— Eric B. (2/5)
Took a while to get
"Took a while to get here, due to the back order, but they got it shipped to me as fast as they could and kept me updated. The brace fits perfect. I use this brace to play volleyball, and it makes me feel safe with the great support."
— Valerie T. (5/5)
Great mobile brace!
"Took quite awhile to arrive but that was a back order issue from the manufacturer NOT Doc Ortho. Doc Ortho kept me up to date about my order and always answered back within 12 hours. Service was great! Brace over all is a game changer for me. I can do pretty much everyday normal skills and it does not budge."
— Regina S. (5/5)
Great product
"Great product"
— Carlos T. (5/5)
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