What kind of knee brace is good to prevent a sports knee injury?

None. There are no proven braces that help prevent knee injuries. However, we feel that a hinged knee brace may offer some support for the knee. Hinged knee braces can be found at most sporting goods stores.
No brace. Unless you are playing the position of a football lineman, the knee brace is not generally found to have an large affect on knee injuries. In linemen, the carbon fiber braces prevent mcl injuries by spreading the load across the thigh and leg. Most other athletes actually get a quadriceps inhibition from use of the braces and in some cases can facilitate an injury.

Related Questions

Will wearing a knee brace while playing sports make it less likely to have an injury or more likely?

Stability. The thought is that wearing a knee brace helps to stabilize the knee and associated ligaments and tendons when you are experiencing pain or minor injury. I see the brace as a protective factor while playing sports if you are dealing with knee tendon or ligament strain/pain. I doubt if it would really benefit or protect you to wear one if no injury exists however. . Read more...

I went to the orthopedic np for knee pain. My MRI and x-rayshowed patellar tilt and hematoma. Treatment suggested:knee brace/warm compress. Should I go to a sports med or an orthopedic md for second opinion?

See below please. To have patellar tilt and hematoma this mean you acute and chronic problem. The acute one is the hematoma. The chronic problem is the tilt. I think going to sport medicine is a good idea but will solve your problem. I personally prefer orthopedic surgeon with sport medicine subspecialty. Read more...
Patellar tilt. Both can be good so long as they listen & do a good exam. Consider transverse ct to evaluate tilt. Also evaluate medial patellofemoral ligament integrity and patellar surface integrity. Read more...
Need good exam. If the tilt was the only problem, fixing the mechanics that caused it would be the first step. In most athletes, this is working on the quad to hamstring strength ratio and strengthening the gluteus medius (many accidently over strengthen the itb/tfl, the other hip abductors, which can worsen the problem). Reasonable to start with non-op sports med, and if hematoma needs to be drained, see ortho. Read more...

Any suggestions on the type of knee brace that should be bought for injuries and support related to knock knees?

Unloading. Yes. The scientific name for "knock knees" is genu valgum. There are braces known as "offloading" braces that can help with the increased mechanical load placed on the inner knee. If it is severe, a high tibial osteotimy is another option that is pretty successful. Read more...

I fell on ice and saw my doc and said it's a bad sprain on my right knee and said to buy a knee brace what kind would be good to get?

A slip on neoprene s. A slip on neoprene sleeve would be inexpensive and reasonable. Read more...
Hinged brace. If you truly have a severe or"bad" ligament sprain treatment depends on the ligament injured. Typically with an acute sprain a hinged brace will give the best support but the actual type should be based on the ligament injured. Therefore you need a more extensive workup by an orthopedic surgeon to determine if there is any instability. Read more...
Knee injury brace. Not enough info for me to answer, so ask the doctor who made diagnosis. Knee braces can prevent medial lateral motion, stop rotation, elevate the patella (knee cap), prevent forward or backward motion, and off load the weight bearings races. The wrng brace won't help and may cause pain. There are specialized orthotic shops which will help you choose the best one, but diagnosis is mandatory. Read more...
Different braces. Each brace is indicated for a different purpose. Each has their strengths and limitations. You will need to be evaluated by a professional to get the best brace for your condition. Read more...
Many types.... If your doctor did not recommend a specific type, then i would go to medical surgical supply store and view the different braces. Read more...