Take Care Of Your Knees, Part 2
By Dr Giles P Croft | Wednesday, August 27, 2008 9.00am
In the first part of this health item we talked about the inner workings of the knee, and how cycling overuse injuries can lead to problems that stem from three broad categories. Here we look at the areas of the knee where pain might be felt, and the speciﬁc conditions that can lead to this.
All of them will have contributory factors from these three problem domains : changes in training intensity (cycling-speciﬁc); changes in equipment (bike-speciﬁc) and our intrinsic anatomical and biomechanical make-up (cyclist-speciﬁc). The key is to identify which of them is most relevant to you and make a change.
There are four areas of knee pain - anterior, posterior, medial/lateral, illiotibial band syndrome
1] Anterior knee pain. Pain at the front of the knee – on and around the knee-cap (patella) – is the most common presentation of cycling overuse injuries, in part due to the anatomy of this area. The large quadriceps muscles attach to the shin bone via the patella, so the forces of pedalling are transmitted across the patello-femoral joint whenever we bend our knees, essentially squashing it back against the thigh bone.
Although more common in explosive sports, the part of the tendon attaching the patella to the bony prominence below the knee-cap can become inﬂamed (patellar tendonitis). If this area is persistently sore to the touch it’s deﬁnitely worth seeking medical help. It should respond to ice, anti-inﬂammatories and physiotherapy, with or without strapping.
However, if you’re reading this and you have anterior knee pain from cycling, chances are you’ve got what’s known as a 'patellar compression syndrome'. The scourge of cyclists and runners alike, it can completely ﬂoor you, causing pain when off the bike and ride-stopping agony when on it.
During the push phase of pedalling, we seldom complete the last 35˚ of knee extension; a movement which is largely under the control of the vastus medialis oblique (VMO) muscle (see 'Stabilising forces on the knee' diagram). This means that over a long period of time, and often in spite of outward appearances, the muscles down the outside of the thigh become much stronger and tighter than these less-used medial muscles.
The patella is pulled subtly off-kilter and forces through the patello-femoral joint increase, causing diffuse pain anywhere around the knee-cap. The soft tissues around the lateral aspect of the patella slowly shorten over time, and make strengthening exercises of the VMO muscle alone largely ineffectual.
Ways you can look after anterior knee pain
The key to treating such a condition is to loosen off the lateral structures before attempting to redress the balance and concentrating on building medial muscle bulk.
The diagram [Four strategies for loosening tight lateral muscles of the thigh, below] outlines various methods for doing just this, all of which aim to reduce the forces through the patello-femoral joint. These should be undertaken in conjunction with the general 'cycling-speciﬁc' and 'cyclist-speciﬁc' solutions outlined in Part 1.
Try to keep your leg out straight, if you’re troubled with anterior knee pain of this type, whenever you have the choice.
Bike-speciﬁc problems to be aware of: a saddle that’s too low or too far forwards; big gears and long cranks.
Building up the vastus medialis oblique muscle can also help. After a week or so of regular stretching and self-massage, work on building up the vastus medialis oblique muscle to balance out the stabilising forces on the patella. It’s slow and can feel pointless initially, but persist with loosening the lateral side then strengthening the medial side, and in a couple of weeks you’ll feel a difference.
There’s not much point in taping up the patella as the forces generated when cycling are too great and the taping just won’t hold. Particularly resistant cases can be tackled by a sports physio, who can work speciﬁcally on mobilising the tight lateral tissues around the patella.
It’s also worth pointing out that cycling isn’t the only time we bend our knees and stress the patello-femoral joint. Crouching down to pick something up and tackling stairs are more obvious activities, but sitting at a desk with feet underneath the chair (or in a cinema seat) for prolonged periods will produce the same effect.
2] Posterior knee pain. Pain behind the knee is far less common, and much more straightforward. It’s almost always due to over-extending the knee.
Bike-speciﬁc problems to look for: a saddle that’s too high or too far back, although these are just as likely to cause pain further up the hamstrings.
Persistent pain behind the knee should be looked at medically to exclude a Baker’s Cyst. Named after the chap originally describing them and nothing to do with making bread, they’re a harmless bulging of synovial ﬂuid into the space behind the knee. Your doctor can discuss treatment options with you.
3] Medial and lateral knee pain. Pain at the sides of the knees is fairly common and the culprits here are almost always the feet, or more speciﬁcally, pedal cleats. To this end, such pain is often noticed during or after the ﬁrst ever ride with cleats, or with a new pair of shoes or replacement cleats.
The structures causing the pain are most often the collateral ligaments which sit on the outsides of the knee joint, stopping them from bending the wrong way.
Bike-speciﬁc problems are usually to blame here: badly placed cleats will either affect the Q angle (how far apart your feet are positioned) or cause excessive rotation of the knee joint, stressing one or other of the collaterals. The Cleat Position and Knee Pain diagram (below) describes the usual culprits and what to do with them.
Ways to avoid medial and lateral knee pain
Check cleats for excessive wear regularly. Always make sure you draw round cleats with a felt tip pen to mark position before replacing them, and experiment with different cleat types until you ﬁnd one with the right amount of ﬂoat for you (too much or too little can both cause problems).
Get off on the right foot. If you’re new to cleats, one tip for getting a good starting position is to sit on the edge of a table with hips, knees and ankles relaxed at 90 degrees. Look down: whatever angle your feet naturally dangle at should be replicated by the cleats.
4] Iliotibial band syndrome
Another painful condition that’s very closely related to patellar compression syndrome is called 'iliotibial band syndrome'. The iliotibial band is a thick ﬁbrous strap of tissue that runs all the way down the lateral thigh, from the pelvis to just below the knee. It’s the structure that has a habit of tightening up over time and pulling the patella off centre if your vastus medialis oblique muscles aren’t strong enough to counteract.
Because of where it sits, as the knee is repeatedly bent and straightened, it moves back and forth over the knobbly end of the thigh bone just above the knee, cushioned by a ﬂuid-ﬁlled bursa. It’s at this point that inﬂammation can occur, which is then irritated each time the knee is bent.
Most commonly seen in runners, it’s an unpleasant condition thought to be exacerbated by weakness of the gluteus medius muscle – another essential core muscle that gets neglected by cycling – and also by wearing cleats that point the toes too far inwards.
How to manage iliotibial band syndrome
In the acute phase of the injury the mainstay of its treatment is the same as any for an inﬂammatory condition: rest, ice and regular anti-inﬂammatory medications such as Ibuprofen, if tolerated. Rehabilitation after this is very similar to that described above for patellar compression syndrome, but with a focus on building up the gluteus medius muscle instead of (or as well as) the vastus medialis oblique.
Near-religious stretching, especially of the iliotibial band, should precede strengthening exercises. A return to normal activities should be phased in gradually, being guided by (a lack of) pain. Incredibly resistant cases can be operated on, but it’s rarely required if the above regime is followed.
Gluteus medius strengthening exercises
The following exercises are all designed to strengthen the gluteus medius muscle – an important core abductor of the hip, oft neglected by cycling. It’s a smallish muscle which, when contracting, can be felt as a lump at the top of the “scoops” of your buttocks – it’s a good idea to place a hand on this area when doing the exercises, to make sure you’re exercising it.
An exercise performed by lying on your good side, with lowermost leg bent for balance. Keeping the uppermost leg straight, and with the foot rotated out to 45°, raise it up and slightly backwards, holding just for a couple of seconds. Lower the leg and repeat, feeling for the contraction of the muscle with your uppermost hand.
Stand sideways on to a wall, balancing on the affected leg, with the unaffected leg lifted just off the ground and pressed against the wall for support. Now slightly bend the knee, dip down by a few inches and hold this position. Keeping your weight on the outside of your foot, now try and twist the knee outwards, stabilising yourself against the wall with your other (raised) leg. This is an excellent way to build the gluteus medius, has the added advantage of also indirectly stretching the fibres of the ITB and what’s more can be done while cleaning your teeth!
Remember the golden rule for knee pain
While this may give you some basic strategies for getting out of trouble when plagued by knee pain, the old adage rings true: stay out of trouble in the ﬁrst place!
- Many problems with the knee can be avoided by not making sudden increases in your training regime or drastic changes in bike set-up.
- Look after your legs and they’ll look after you: stretch all the big muscle groups after each ride and treat them to the odd massage.
- Lastly, don’t neglect core muscle strength – smaller core muscles can relieve much bigger limb muscles of surprisingly large loads.
The scope of this article is limited to some of the more common overuse injuries, so if you’ve sustained an acute injury or experience sudden pain, or if your symptoms don’t improve with this very general advice, please seek appropriate medical help.
Four strategies for loosening tight lateral muscles of the thigh
As well as the usual stretches for quads and hamstrings – always a good idea – there are two stretches that target the lateral structures, in particular the iliotibial band. Contrary to popular belief, it is possible to stretch the lower end of the iliotibial band.
1 Lower Iliotibial band stretch
- Lie on your good side, in a straight line along the edge of a bed so you're looking across the bed.
- Hold on to the end of the bed with your lower arm for support.
- Reach behind you with your upper arm and pull your foot to your bottom, as if you were doing a regular quads stretch.
- Keeping your foot against your bottom, gently increase the quads stretch by pulling your leg backwards. You'll feel it along the front of your thigh – let yourself relax into this stretch.
- Still holding this stretch, and making sure you don't tilt your hips backwards, now very gently push your knee down towards the floor.
At a certain point you should feel quite a sharp stretch down near the knee – perfect for lengthening those tight soft tissues around the lateral aspect of the patella. It's important to keep your whole body in line and perpendicular to the bed during the stretch. If you['re lucky enough to be able to enlist the help of a patient friend, then ask them to place one hand on your hips (to stop them from rocking backwards) and push down – very gently! – on your knee with the other. This produces a better stretch, since you can completely relax the leg as it's being pushed down.
2 Upper Iliotibial band stretch
- Standing upright, cross your bad leg behind your good one, making sure you keep it locked straight.
- Then, without bending forwards, gently lean sideways from the waist over to the good side.
- You can support yourself against a wall by leaning away from it. You should feel this stretch over the outside of the hip and upper thigh.
3 Massage: You can do this yourself, after a ride or a hot bath. With the leg locked out straight, rub with firm pressure all along the outside of the thigh. This is most easily achieved by using the palm of your hand to rub a squash ball in a circular motion over the muscles. Alternatively, use a little oil and the flats of your fingers or thumb. If you're really lucky, you'll have a willing helper to do it for you.
4 Trigger points: This doesn't work for everyone, but applying deep, sustained pressure (for up to 30 seconds) with a thumb over particularly tight or painful areas along the lateral thigh can sometimes work wonders. Sit down, lock your leg out straight to relax all the quads and find problem areas by massaging.
Pressing hard can cause your eyes to water if you're feeling particularly tender, but persist with it and you'll often feel tight spots twitching in submission and relaxing under the pressure. An indirect and effective way of pinpointing these trigger points is to lie on your side and gently lower the weight of your leg on to a tennis ball. Be warned though, it's not for the faint-hearted!
Stabilising forces on the knee
Vastus Muscles and Rectus Femoris – the medical names for separate parts of the quadriceps (front of thigh) muscles. Iliotibial Band (ITB) – a thick, ﬁbrous strap of tissue running all the way down the outside of the thigh. Can get very tight, pulling strongly on the kneecap.
Lateral retinaculum – short, tough ligaments tethering the kneecap to the ITB. Can shorten over time, compounding problems of a tight ITB.
Medial Retinaculum – similar to lateral retinaculum but less ﬁbrous, exerting less of a pull on the kneecap.
Patellar Ligament – a continuation of the tendon coming from the quads muscles. It's how they attach to the shin bone.
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