Instruction: Given a question and the related document, predict if the question is answerable based on the information provided in the document. Output only yes or no.

Input:
Question: i had lower back surgery 10 yrs. ago.can i use it
Document: I am a medical doctor who has suffered from chronic back pain for over twenty years. I have had surgery on L5  (discectomy), but was left with lower back pain and sciatica. Physical therapy did not provide any benefit. I have tried the chiropractor, and his traction routines were helpful, but the relief never lasted more than a day or two,  The theory behind inversion therapy is logical - utilize gravity in favor of decompressing and extending the spine.
I have suffered from lower back and sciatic condition for forty years. Ever since I purchased the Teeter Hang Ups, I exercise, and as part of the cool down, I get on the machine for 10 minutes while listening to relaxation music. The next day when I wake up, there is no pain, no inflamation and I have not had to stop any workout due to back problems.
I have had lower back problems for quite a while. But had a resurfaced hip about 5 years ago so I was a little concerned about whether the table would cause damage to the hip socket area. Well, the table actually helps my hip area! It stretches the ligaments and tendons and my gait is much more natural than it was. I no longer feel the tightness that I've had for so many years.As for my back?
Once I fully relaxed and spent about 10 minutes at 20 degrees I could tell that things were pretty stretched out when I went back to an upright position. Standing on the floor, I felt like I was standing up straighter and my lower back felt a little better.I've read many reviews where people say that it may take several weeks of constant frequency of some kind. I think I tend to agree with this.
Began having once a year lower back issues that would immobilize me for a week. Then 8 months ago after a 50 mile bike race my back went out and never recovered fully. I had pain constantly that prevented normal movement and sleep. I watched a snow ski season pass me by as it was to painful to ski two days in a row. Then this spring when I got on my bike for the first ride I was unable to straighten up after a short 15 mile ride.
But, keeping it on 60 degrees, I think it's fantastic.When I first received it, I had so much pain running down my legs, I had trouble walking. Now, after 5 months, I have very little and sometimes no pain at all. I don't use it every day, only when my back hurts and then for 5 to 10 minutes.I really wish I have used this prior to the steroid injections, which worked on me for about a month.
I should have bought this 20 years ago. If you adjust the leg length correctly (I'm 5'10" and use the 6' mark), getting back up is as easy as putting your hands at your sides. And no, you don't have to go completely upside-down. It is all run from an incredibly natural pivot. The relief of back pain received from stretching your back is pretty amazing. My neighbors are buying them now after I let them try it too.
We had an older Teeter (probably ~ 10 years old), but to be honest never really used it much because my wife found it difficult to use and it was sore on her ankles.This newer model (EP-960) was fairly simple to assemble in approx 45 mins - 1 hours.
I do a lot of  yard work in a bent over position; and there are days when I can barely straighten up. Now, after a day of yard work, I use my table for about 10 minutes. When I get off, I feel like a new person.This has probably been the most used purchase I have made in years (other than my 55&#34; SONY!). As for putting it together - simple!
The product itself is solid and easy to use, the hesitatation to rate this a 5 out of 5 is because of the downside if you have a back problem. When you are inverted your spine opens up and will feel much better if you have back problems especially lower back problems. Regrettably when you come upright again and with upright gravity the pain in your back is worse. When discussing this with medial professionals they confirmed their understanding of this reaction.
Answer: yes