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.

ASIN	B00YBSL8MG
Age Range Description	Adult
Age range (description)	Adult
Best Sellers Rank	#62,772 in Health ( See Top 100 in Health ) #364 in Knee Braces
Brand	DonJoy Performance
Brand Name	DonJoy Performance
Closure Type	Hook & Loop
Color	Black
Colour	Black
Customer Reviews	4.2 out of 5 stars 1,476 Reviews
Global Trade Identification Number	00888912066402
Included Components	Medical Brace
Item Dimensions	36.8 x 14.7 x 6.9 centimeters
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	MCL and LCL Instabilities, Knee Hyperextension, General Meniscus Support
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
Use for	Legs

DonJoy Performance Bionic Knee Support Brace: Black, Medium

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