Squat form check, please.

[Inhyuk Eun]

Hello!
I'm Inhyuk.
29 year old male/ 5'8"/ 222 lbs
I have been running Texas Method about a year..

I want form check of my squat.
I attended SS Seminar in Seoul, Korea on July, 2014.
And Mr.Rippetoe gave me a cue 'Nipples to ground'.
I tried squat with that cue but It seems I'm much vertical than other guys.

https://youtu.be/zeeb0_FlB6U - side

https://youtu.be/yXePmOnxsSE - rear 45' angle.

Is it acceptable?
Since I feel like I'm having patella tendon and hip tendon on my left leg, I want to fix my squat form.

Thanks.

[Tom Campitelli]

The first movement you perform on your descent is to arch your back. Don't do that. That is not very good for it. Just take a big breath in and contract all of the muscles of the torso. Your back should not flex or extend while you are squatting. Other than that, your squat looks really good. I don't see anything that would injure your patellar tendon or your hip from the video.