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

Bionic Knee Support Brace Black Medium

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HK$1325

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Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

STAY PUT TECHNOLOGY - Anti-migration system eliminates slippage, so your brace stays exactly where you need it during activity.
CUSTOMIZABLE PRECISION FIT - Top and bottom stretch webbing closures with TPR pull tabs ensure a tailored, secure fit every time.
VISIBILITY MEETS PERFORMANCE - Reflective elements boost low-light visibility, combining safety with high-performance support.
UNMATCHED STABILITY SUPPORT - Bi-directional hinges with hyperextension stops protect against knee instability and lateral forces.
EFFORTLESS COMFORT WEARABILITY - Wraparound design allows quick on/off without removing shoes, perfect for busy professionals on the move.

The DonJoy Performance Bionic Knee Support Brace in black (medium) offers advanced knee stability with bi-directional polycentric hinges and hyperextension stops. Designed for active adults, it features breathable neoprene, anti-migration technology, and a wraparound design for easy wear and precise fit via stretch webbing closures with TPR pull tabs. Reflective accents enhance safety during low-light activities, making it a top choice for sports and everyday knee protection.

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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