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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Bionic Knee Brace (Black, Medium)

Product ID: 21158372

Details

Age Range (Description)
Adult
Brand
DonJoy
Size
Medium
Specific Uses For Product
MCL and LCL
Use for
Legs

🎯TPR pull tabs & stretch webbing for precision fit

🦾Bilateral polycentric hinges for dynamic support

🌬️Perforated neoprene ensures max breathability

£80.98

Duties & taxes included

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Description

🦵 Power your stride with precision-engineered knee support!

ALL DAY COMFORT - Wrap-around design combined with anti-migration tech keeps the brace comfortably in place without slipping.
BREATHE PERFORM - Perforated neoprene fabric maximizes airflow, keeping your knee cool and dry during intense activity.
CUSTOM PRECISION FIT - Top and bottom stretch webbing closures with TPR pull tabs deliver an adjustable, secure fit tailored to your movement.
ENGINEERED STABILITY - Bilateral polycentric hinges with hyperextension stops protect against knee instability and injury.
STAY VISIBLE STAY SAFE - Reflective elements enhance low-light visibility, perfect for early morning or evening workouts.

The DonJoy Performance Bionic Knee Brace (Black, Medium) is a high-performance orthopedic support designed for adults with MCL/LCL instabilities, knee hyperextension, and meniscus support needs. Featuring bilateral polycentric hinges, adjustable stretch webbing with TPR pull tabs, anti-migration technology, breathable perforated neoprene, and reflective accents, it offers a secure, comfortable fit that enhances stability and visibility during physical activity.

Specifications

ASIN	B00YBSL8MG
ASIN	B00YBSL8MG
Age Range Description	Adult
Best Sellers Rank	#44,871 in Health & Household ( See Top 100 in Health & Household ) #185 in Knee Braces
Brand Name	DonJoy Performance
Closure Type	Hook & Loop
Color	Black
Customer Reviews	4.2 4.2 out of 5 stars (539)
Date First Available	May 27, 2015
Department	Unisex-Adult
Global Trade Identification Number	00888912066402
Included Components	Medical Brace
Item Dimensions	14.5 x 5.8 x 2.7 inches
Item Weight	0.45 kg
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 Dimensions	14.5 x 5.8 x 2.7 inches; 15.87 ounces
Size	Medium
Specific Uses For Product	MCL and LCL Instabilities, Knee Hyperextension, General Meniscus Support
Target Use Body Part	Legs
UPC	888912066402
Unit Count	1 Count

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