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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🦵 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 workouts or daily wear.
UNMATCHED JOINT STABILITY - Bi-directional hinge with hyperextension stop protects against knee instability and injury during intense 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 enhance safety during low-light runs or evening activities, blending function with style.
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) combines advanced bi-directional polycentric hinge technology with breathable neoprene and anti-migration features to deliver superior knee stability and comfort. Designed for active professionals, its wraparound design and precision fit closures make it easy to wear all day, while reflective accents boost visibility in low light. Engineered by the global leader in sports medicine, this brace protects against hyperextension and lateral forces, helping you stay active and confident.

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Manufacturer	DJO Global
Part number	DP151KB04-BLK-M
Item Weight	450 g
Product Dimensions	36.83 x 14.73 x 6.86 cm; 450 g
Is Discontinued By Manufacturer	No
Size	M
Color	Black
Style	Right Leg (Black)
Material	Neoprene
Number Of Pieces	1
Included Components	medical braces
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	36.8 x 14.7 x 6.9 cm

DonJoy Performance Bionic Knee Support Brace: Black, Medium

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