will this fit left or right knee?

It should fit both knees. It is designed for both of them. The sleeve knee braces are where you have to select which knee if I'm not mistaken.

My thigh 19, knee 15.5, calf 15.1. thigh n calf meets m size, but knee is an l. which one should i ordr?

My knee support has a surprising range of adjustability. That said, my choice would be the large; I hope that helps with your decision. My brace is working very well for alpine skiing and has made it possible to continue in a sport I enjoy.

What are the butterfly strap measurements per size? Got a small and outer straps fit, but inner butterfly straps do not.

I’m not sure what you mean by butterfly straps there are 2 straps that you have to put through a little buckle and bring back around so it adheres to the Velcro. It is stretchy.

Does this knee brace have an opening behind the knee?

No only opening is area around knee cap

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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DonJoy Performance Bionic Knee Brace – Hinged, Adjustable Patella Support, Lateral / Medial Ligament (ACL, MCL, LCL), Meniscus, Knee Sprains for Soccer, Basketball, Skiing, Hockey, Running, Water

Product ID: 109763928

Details

Age range (description)
Adult
Brand
DonJoy
Size
M
Specific uses for product
Knee Support
Use for
Knee

🎯Top & bottom stretch webbing closure with TPR pull tabs

🦾Bilateral polycentric hinges with hyperextension stops

🌬️Perforated neoprene for max breathability

51.31 OMR

Duties & taxes included

In stock

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Description

🦵 Elevate your knee game with pro-level support and comfort!

SMART STORAGE - Built-in stash pocket for keys and cards means you stay hands-free and focused on your game.
ALL DAY COMFORT - Wrap-around design with breathable perforated neoprene ensures you stay cool and comfortable, no matter the intensity.
UNMATCHED STABILITY - Bilateral polycentric hinges with hyperextension stops protect your knee from lateral forces and instability.
VISIBILITY MEETS SAFETY - Reflective elements enhance your visibility during low-light training or evening runs.
PRECISION FIT ZERO SLIP - Advanced stretch webbing and anti-migration tech keep your brace locked in place during every move.

The DonJoy Performance Bionic Knee Brace delivers industry-leading knee stability with bilateral polycentric hinges and hyperextension stops, combined with breathable neoprene and anti-slip technology. Designed for athletes in soccer, basketball, skiing, and more, it offers a precision fit, enhanced visibility, and convenient storage, making it the ultimate choice for active professionals seeking reliable knee protection.

Specifications

ASIN	B00YBSL8MG
Age Range Description	Adult
Best Sellers Rank	112,335 in Health & Personal Care ( See Top 100 in Health & Personal Care ) 856 in Knee Braces 8,859 in Over-the-Counter Medication
Brand Name	DonJoy Performance
Closure Type	Hook & Loop
Colour	Black
Customer Reviews	4.1 4.1 out of 5 stars (537)
Global Trade Identification Number	00888912066402
Included Components	Medical Brace
Item Dimensions	36.8 x 14.7 x 6.9 centimetres
Item Weight	0.45 Kilograms
Manufacturer	DJO Global
Material	Neoprene
Model Number	DP151KB04-BLK-M
Number of Items	1
Part Number	DP151KB04-BLK-M
Product Care Instructions	Hand Wash Only
Size	M
Specific Uses For Product	Knee Support
Sport Type	Walking
Target Use Body Part	Knee
UPC	888912066402
Unit Count	1.0 count

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