Knee Pain and Bicycle Position

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01/1/2003| 0 comments
by Chad Asplund, MD

Knee Pain and Bicycle Position

Fine-tune your bike position to avoid early season injuries.

Wintertime is here.   Many of us are indoors on stationary trainers wishing the snow would melt and dreaming of the first early season ride.   Many common cycling injuries are due to poor bike positioning.   Time spent on an indoor trainer can be a useful way to fine-tune your bike position and potentially avoid early season injuries.

 

Knee and hip pain are the most common cycling injuries, especially in the early season.   The most common cause of knee and hip pain in cyclists is iliotibial band (IT band) syndrome.   The IT band is a thick fibrous band of tissue, which runs on the outside of the leg from the hip to the knee.   Pain is caused when the band becomes tight and rubs over the bony prominences of the hip (greater trochanter) and/or the knee (lateral epicondyle).   Tight inflexible lower extremity muscles may worsen the condition. Pain may also be caused by inappropriate seat position, saddle position, cleat alignment, or by individual cyclist anatomy.

 

A simple seat height adjustment may ease the forces placed on the knee.  If the seat is too low, too much stress is placed on the knee from the patellar and quadriceps tendons. If the seat is too high, pain may develop behind the knee.  Therefore, proper seat height is essential.


 

There are several different ways to determine proper seat height.   The easiest way to do this is to allow one pedal to drop to the 6 o'clock position and observe the angle of flexion in the knee joint.   There should be a 25-30 degree flexion in the knee when the pedal is at the bottom most point.   Another method is to measure your inseam (in centimeters) and multiply this measurement by 0.883.   This should be your distance from the top of the seat to the center of the bottom bracket.   Your hips should not rock back and forth when you pedal ? that means your legs have to stretch to far to reach the bottom of the pedal stroke.  If your hips rock when pedaling, lower your saddle until you achieve a smooth pedal stroke.

 

Seat fore/aft position and cleat position may also contribute to knee pain.   Saddles that are too far back cause the cyclist to reach for the pedal and stretch the IT band with resultant knee pain.   Saddle position can be evaluated with the ?plumb bob technique?.   Seated with the pedal in the 3 o?clock position, a ?plumb? hung from the most forward portion of the knee, should intersect the ball of the foot and the axle of the pedal.  

 

Cleats that are too far internally rotated may cause increased stress to the IT band as it crosses the outside of the knee. Cleats should be positioned fore/aft so that the ball of your foot is directly over the axle of the pedal.   Rotational cleat position can be evaluated by use of a commercial/bike shop ?fit kit? or rotational adjustment device ? this

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