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I've noticed some knee pain arising recently from cycling. a throbbing around and below the kneecap, while I sit at my desk during work. To try and counteract this I've been increasing the height of my seat. This has gotten to the point where my hips slightly rock during cycling.

I know there is a few things I do that do not help.

I ride a fixie: I've tried taking the starts and stops slower in order to minimise tension in my knees. Also I always use the front brake to slow down.

What steps can be taken to eliminate knee pain. It's causing some concern considering my daily cycle is <15mins of urban cycling.

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What is your gearing? –  Vincent Agnello Jan 14 '12 at 5:48
    
Did you recently start cycling again? Probably patellar tendinitis... –  dotjoe Jan 14 '12 at 16:11
    
@VincentAgnello 44/16 –  Will Jan 31 '12 at 19:17
    
That's steep. My knees complain loudly with gearing comparable to that. I would recommend trying a 22t ring in the rear. Gear Inches data: 44x16 = 74.3, 44x17 = 69.9, 44x18 = 66.0, 44x19 = 62.5, 44x20 = 59.4, 44x21 = 56.6, 44x22 = 54.0 –  Vincent Agnello Feb 2 '12 at 18:27
    
@VincentAgnello I'm kinda concerned about spinning wildly on that gearing, I've a mellow enough hill to go down on the maybe a 40o-ish incline. I'm not sure of that rpm I'd need to keep for that. I gravitating towards a 19t gear, how much spinning will there be on 22t ring? dotjoe if this is the case what is the best method of shifting this over two weeks later and still off the bike the pain continues. and I have book an appointment with the physio –  will Feb 3 '12 at 9:12
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5 Answers

It might also help to work out your leg muscles in the gym. There are many muscles that are useful that aren't easily trained just on the bike. Stabilizer muscles and quads. On the topic of fixed gear, there is a reason the top track guys are all hitting the gym.

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But this is where a good physical therapist is needed -- to advise on which muscles to strengthen. Depending on the specific knee problem you need to strengthen different muscles, and doing the wrong ones can make things worse. –  Daniel R Hicks Jan 14 '12 at 4:01
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I am a physician (not practicing anymore), a biker, and an office worker. And I ride fixie. And I sometimes have knee discomfort. So, my few cents:

  • Depending on HOW YOU SIT DURING WORK, specially how you rest your legs/feet, your knee might be twisted for a long time (hours a day). Watch yourself if it is happening or not.
  • Take a rest on the fixie. I noticed it is only nice when you are "energized". Sometimes we are a bit tired or "low mood". These are not good times to ride fixed, I think. So, take an abundantly-geared beater or something, until you get better.
  • If you don't get the rest, try not to accelerate or decelerate too fast. If you ride in traffic, give up riding faster than motor vehicles, for a while, until your knee gets better. I think speed is not so important (spinning is winning, Stephen said), but bursts of acceleration or deceleration put a stress on the knees.
  • Watch yourself while pedalling. If you notice some movements reproduce the pain you feel, change your habit, avoid them as much as you can. But try to keep efficient. If you have to create an anti-natural position so as not to feel pain, things are starting to get ominous!

Other factor: you mentioned your cycle is short, less than 15min (so is mine). I found this to be a problem, because you always ride "cold". Perhaps you could warm-up and stretch, at home (learn how to stretch thigh and calf properly, first), or even take a LONGER way to work, so you can ride lightly for more time, thus pumping some nutrients inside your joints' tissues instead of just hammering'em cold.

At last, seeing a doctor (preferrably specialized in sports medicine) and doing some physical therapy is always something to consider. But don't think that is more important than self-observation, self-knowledge and self-control.

Hope it helps.

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Yep, the warmup is important. But most authorities now recommend against "stretching", as that doesn't really warm you up, and can even lead to injury. Better to chose a route that lets you take it easy for the first 5 minutes or so, to get the juices flowing. –  Daniel R Hicks Jan 13 '12 at 21:40
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I like your first point best. It's probably work that's doing it. Work less, cycle more! –  James Bradbury Apr 12 '13 at 7:49
    
I noticed that moving the chair around using leg flexion (pulling you closer to the desk by your feet pulling the ground back) can cause specific discomfort if you do that often... –  heltonbiker Apr 12 '13 at 14:07
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Yep, three points:

  1. Don't ride a fixie. (Not what you wanted to hear.) The knee is the weakest part of the human body, and riding in too high of a gear puts enormous stress on it. A fixie has you riding in the wrong gear most of the time.
  2. Raise your seat. (Though it sounds like you've done this.) Having your seat too low amplifies the stress on the knee. The seat should be as high as reasonably possible without causing you to slip side-to-side as you pedal.
  3. Use toe clips. I don't know exactly why, but toe clips help relieve stress on the knee. (And it may be that old-fashioned strap-type clips are better than "clipless", as they don't stress the knee sideways, and don't require knee stress to unclip.)

Visit a orthopedist or at least a medically-qualified physical therapist to find out which variety of knee pain you're experiencing (there are several different knee pain syndromes) and what therapy you should use for it. Very often the right exercises (eg, straight leg lifts) can make a world of difference.

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I think the toe clips might help sometimes because they keep you from sometimes ending up with an odd angle that puts strain on your knee in a way it doesn't like. I've also heard people allege that they increase chances of repetitive stress injuries, though, so I'm not sure! –  Jefromi Jan 13 '12 at 20:08
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Seek professional medical advice, either a physiotherapist or a sports doctor. Also, have your bike fit checked (see this question).

Cycling in too high a gear, particularly uphill is a pretty good way to hurt your knees, so you may want to get a bike with multiple gears.

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Lower your gear ratio. Spinning is winning.

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