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

DonJoy Performance Bionic Knee Support Brace: Black, Medium

Product ID: 727809766

Details

Age Range (Description)
Adult
Brand
DonJoy
Color
Black
Material
Neoprene
Size
M

🎯TPR pull tabs & stretch webbing for precision fit

🦾Bi-directional polycentric hinges for dynamic stability

🌬️Breathable neoprene with anti-migration tech

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€ 192.66

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Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🦵 Unlock your knee’s full potential with pro-grade support and comfort!

STAY DRY STAY SECURE - Breathable neoprene fabric wicks moisture while anti-migration technology prevents slippage all day long.
VISIBILITY MEETS SAFETY - Reflective elements enhance low-light visibility, keeping you safe during early morning or late evening workouts.
CUSTOMIZABLE PRECISION FIT - Top and bottom stretch webbing closures with TPR pull tabs ensure a snug, personalized fit that stays put.
ENGINEERED FOR ELITE SUPPORT - Bi-directional polycentric hinges with hyperextension stops deliver unmatched knee stability during intense activity.
EFFORTLESS COMFORT MOBILITY - Wraparound design allows quick on/off without removing shoes, perfect for busy professionals on the move.

The DonJoy Performance Bionic Knee Support Brace is a premium, medium-sized knee brace designed for adults seeking advanced joint stability and comfort. Featuring bi-directional polycentric hinges with hyperextension stops, it supports knee instability caused by injuries or sports activities. Its wraparound design with stretch webbing closures and TPR pull tabs offers a precise, secure fit, while breathable neoprene and anti-migration technology ensure all-day comfort without slippage. Reflective accents boost safety during low-light conditions, making it ideal for active professionals who demand both performance and style.

Specifications

ASIN	B00YBSL8MG
Age Range Description	Adult
Amazon Bestseller	#359,488 in Health & Personal Care ( See Top 100 in Health & Personal Care ) #2,275 in Knee Braces
Brand Name	DonJoy Performance
Closure Type	Hook & Loop
Color	Black
Customer Reviews	4.2 4.2 out of 5 stars (419)
Global Trade Identification Number	00888912066402
Included Components	Medical Brace
Item Dimensions	36.8 x 14.7 x 6.9 cm
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
Sport Type	Baseball, Tennis
UPC	888912066402
Unit Count	1.00 Count

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