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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DonJoy Performance Bionic Knee Support Brace: Black, Medium

Product ID: 273540040

Details

Age range (description)
Adult
Brand
DonJoy
Size
M
Specific uses for product
MCL and LCL
Use for
Legs

🎯Top & bottom stretch webbing closure with TPR pull tabs

🦾Bilateral polycentric hinges with hyperextension stops

🌬️Perforated neoprene for max breathability

S$179

Duties & taxes included

In stock

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Description

🦵 Elevate your knee game—support that moves with you, not against you!

STAY COOL STAY VISIBLE - Perforated neoprene maximizes breathability while reflective accents boost your visibility in low-light conditions.
PRECISION FIT ZERO SLIP - Top and bottom stretch webbing with TPR pull tabs ensure a custom, secure fit that stays put during intense activity.
DYNAMIC STABILITY IN MOTION - Bilateral polycentric hinges with hyperextension stops provide unmatched support for unstable or injured knees without restricting natural movement.
ALL DAY COMFORT EFFORTLESS WEAR - Wrap-around design allows quick on/off without removing shoes, combined with asymmetrical hems for a glove-like feel.
TRUSTED SPORTS MEDICINE INNOVATION - From the #1 global sports medicine brand, engineered to protect and support MCL, LCL, and meniscus injuries during walking and sport.

The DonJoy Performance BIONIC Knee Support Brace delivers advanced lateral knee stability through bilateral polycentric hinges with hyperextension stops, combined with breathable perforated neoprene and a precision fit wrap-around design. Engineered for MCL, LCL, and meniscus support, it offers all-day comfort and enhanced visibility, making it the go-to brace for active professionals who refuse to let knee instability slow them down.

Specifications

ASIN	B00YBSL8MG
ASIN	B00YBSL8MG
Age Range Description	Adult
Best Sellers Rank	#100,975 in Health ( See Top 100 in Health ) #661 in Knee Braces
Brand Name	DonJoy Performance
Closure Type	Hook & Loop
Color	Black
Customer Reviews	4.1 4.1 out of 5 stars (1,544)
Customer reviews	4.1 4.1 out of 5 stars (1,544)
Department	Unisex-Adult
Global Trade Identification Number	00888912066402
Included Components	Medical Brace
Is Discontinued By Manufacturer	No
Item Dimensions	36.8 x 14.7 x 6.9 centimeters
Item Weight	0.45 Kilograms
Item model number	DP151KB04-BLK-M
Manufacturer	DJO Global
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
Product Dimensions	36.83 x 14.73 x 6.86 cm; 450 g
Size	M
Specific Uses For Product	MCL and LCL Instabilities, Knee Hyperextension, General Meniscus Support
Sport Type	Walking
Target Use Body Part	Legs
UPC	888912066402
Unit Count	1 Count

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