1 CYCLING PROBLEMS IN THE KNEE Mr D Raj FRCS (Tr & Orth) Consultant Lower Limb Orthopaedic Surgeon Bostonian Private Wing Pilgrim Hospital, Boston Lincolnshire PE21 9QS Tel: Website: Bostonkneeandhipservice.org.uk
2 1 Introduction Cycling is a great low-impact aerobic activity. Cyclists are usually more efficient on both hills and flat terrain when they pedal quickly (at about rpm) rather than at slower cadences. Although cycling is considered a knee-sparing exercise because it does not require impact with the ground, the repetitive motion of pedalling can lead to a variety of overuse knee injuries. The majority of cycling injuries are indeed caused by overuse, which leads to cumulative tissue microtrauma and consequent symptoms. In overuse injuries the problem is often not acute tissue inflammation, but chronic degeneration. Cycling is obviously very repetitive: during one hour of cycling a rider may average up to 5000 pedal revolutions. But which cyclists sustain overuse knee injuries? Basically, cyclists of every ability level are at risk: riding too hard, too soon and too far is the usual recipe for numerous knee problems. Touring cyclists often develop a knee overuse injury during or after one specific usually long ride. These sporadic high-mileage riders often do not train adequately. Patellar pain is the most frequent problem (for more information see our Patellofemoral problems page), followed by Iliotibial Band Syndrome (see Overuse Injuries page and scroll down to ITBS section for further information). Bicycle maladjustments are also frequent in this group and amongst recreational cyclists.
3 Cyclists vs. Runners Cycling and Running are two very popular sports, but compared to cycling, running seems to be a better way do build up leg bone density, while cycling regularly will improve on upper limb bone density. This is very important when you consider that osteoporosis causes 310,000 fractures in the UK every year. Runners have a bit less developed arm muscles. Apart from that, it seems that cycling and running have similar effects on body composition: participants in both have approximately 10% more leg muscle than the exercise abstainers. Knee Pain The knee is the most common site of overuse injury in the cyclist, with an estimated 40% to 60% of riders experiencing knee pain. Like other cyclists, mountain bikers can suffer overuse injuries. Such injuries have been studied little in mountain bikers. In one study involving 265 off-road cyclists, 30% had recently experienced knee pain associated with mountain biking, and 37% reported low-back pain while riding; wrist pain and hand numbness were each reported by 19% (4). Overuse injuries: in chronic cases, continued activity produces degenerative changes that lead to weakness, loss of flexibility, and chronic pain. Thus, in overuse injuries, the problem is often not acute tissue inflammation, but chronic degeneration (hence, for example, patella tendinosis instead of tendinitis). Pain in overuse injuries typically has insidious onset, but it may have an acute-on-chronic presentation. Overuse injuries most likely occur when an athlete changes the mode,
4 intensity, or duration of training. Biomechanic (intrinsic) factors and equipment or training (extrinsic) issues are the main contributors to overuse injuries (3). When evaluating knee pain it is very important to consider cyclists and bicycle anatomy, seasonal variations (early cycling season), training distance and intensity, and numerous human anatomical factors such as inflexibility, muscle imbalance, patellofemoral malalignment, leg-length discrepancy, etc. Do check the leg length: if the difference is up to 10 mm you can correct it by putting spacers under one cleat. If one leg is shorter by more than 10 mm you should try a shorter crank arm on the short leg side. Generally using shorter cranks keeps pedal speed up and knee stress down. Too long crank arms increase forces on the entire knee, but patellar and quadriceps tendons are most affected. For information on special bicycle adaptations see Chris Bell's website: Highpath Engineering Specialist Services. Causes of Knee Pain in Bicycling Factor Anatomy Leg-length discrepancy Wide pelvis Pes planus and/or pronation Internal tibial rotation Muscle weakness of quadriceps, hamstrings, hip flexors, gluteus Leg inflexibility Bike Fit Saddle too high Saddle too low Saddle too far forward Saddle too far back Crank arms too long Internally rotated cleats Externally rotated cleats Training Rapid increase in distance or intensity Excessive hill work (on bike) Pushing high gear ratio Hill running (on foot) Deep leg squats Possible Result ITB stretch on shorter leg, posterior knee str Lateral knee stress (increased Q angle) Medial knee pain Patellar malalignment Fatigue-induced alterations in pedaling techn that transfer stress to other parts of the kine ITB syndrome Knee extension that irritates the ITB, stress biceps tendon, patellofemoral loading, hips s by rocking while pedaling, posterior knee pa Stress on patellar and quadriceps tendons Stress on anterior knee from pedaling in hyp position ITB stretch from excessive forward reach for pedal, stress on biceps tendon Increased forces on the entire knee; patellar and quadriceps tendon are most affected Patellar tendinosis, tibial rotation stress on a knee Medial knee stress Muscle tightness, microtrauma Cartilaginous breakdown, chondromalacia Medial knee stress Medial knee stress (uphill), tight quadriceps Increased stress on entire knee ITB = iliotibial band Source: Chad Asplund and Patrick St Pierre: Knee Pain and Bicycling. The Physician and Sportsmedicine, April 2004.
5 Further information on cycling knee problems: 1. Tony Wanich, et al.: Cycling Injuries of the Lower Extremity. J Am Acad Orthop Surg, December 2007;15: Michael J Callaghan: Lower body problems and injury in cycling. Journal of Bodywork and Movement Therapies (2005) 9, Chad Asplund and Patrick St Pierre: Knee Pain and Bicycling. The Physician and Sportsmedicine, April Please note that free access to this article is no longer available from the PSM. However, try this link: 4. Robert L Kronisch: Mountain Biking Injuries: Fitting Treatment to the Causes. The Physician and Sportsmedicine, March Please note that free access to this article is no longer available. 5. Emma Colson: Knee Pain - Anterior Anguish. PDF download. Topbike Physio, March - April 2006 Bike Fit Proper bike fit is essential in reducing the incidence of knee and numerous other injuries. Frame size, seat height and position, handlebar height and position, crank length, and foot position are the primary fit-related adjustments that must be made for each cyclist. A comfortable, perfectfitting bike means your skills will improve immeasurably as you go out and enjoy each ride. And it all starts with the frame. Handlebars, stems and saddles can be swapped out or adjusted to create a better-fitting bike. But getting the frame right is the important first step (2). And again, correct positioning and set-up of all components are extremely important in achieving optimum power output and avoiding overuse knee and other injuries. Further information: 1. Robert L Kronisch: How to Fit a Mountain Bike. The Physician and Sportsmedicine, March Please note that free access to this article is no longer available. 2. REI staff: The Perfect Fit - Bike Fit Basics. REI Expert Advice. 3. Guy Andrews: Andy Pruitt's Fit Tips. Gear News, 23 January RoadCyclingUK.com. 4. Matt Russ: Correcting Knees-out Pedalling. Active.com Cycling. 5. Rob Coppolillo: Love Thy Knees: Get the Right Fit. Active.com Cycling. 6. Edmund R Burke: Knees Among Most Vulnerable Joints for Cycling Injuries. Active.com Cycling. How to Choose Cycling Shoes REI staff. How to Choose Cyclinig Shoes. REI Expert Advice. Indoor Cycle Trainers The UK weather is not an excuse for giving up on cycling. If you have a bit of space at home, and a few pennies for a decent cycle trainer or a roller, or both, you can continue
6 to cycle, workout, build endurance, gain confidence, loose weight, etc. Indoor cycle training is not something reserved for winter months and bad weather. Rather, it is the most effective and rewarding exercise to do when conditions and circumstances will not allow you to get outside and ride a bike. Basically, if you want fitness training get a cycle trainer but if you want technical training get rollers. Rollers are less boring than cycle trainers, are nearly silent to operate and cause less tyre wear, but require a great deal more concentration than cycle trainers. Rollers are hands down the best way to maintain bike-handling skills and a fluid pedal stroke. Cycling for Knee Rehabilitation Exercise bikes, static bikes, stationary cycles, bicycle ergometers - these are all names for the bicycles that you find in virtually every physiotherapy clinic, gym or health club across the world. Many knee rehabilitation protocols include cycling so why is this exercise modality so popular for knee rehabilitation? In comparison with other exercises cycling is a relatively knee friendly activity that can help to improve knee joint mobility and stability. Cycling is frequently used as a rehabilitation exercise modality after knee injury or surgery as well as part of the management of chronic degenerative conditions such as osteoarthritis. This article will give you an insight into the use of a cycle for knee rehabilitation: Karen Hambly: Cycling for Knee Rehabilitation. Cartilage Health For specialist bicycle adaptations see Chris Bell's website: Highpath Engineering Specialist Services. Site last updated on: 11 Feb 2011 Disclaimer: This website is a source of information and education resource for health professionals a Neither Chester Knee Clinic nor Vladimir Bobic make any warranties or guarantees that the informat complete, and are not responsible for any errors or omissions therein, or for the results obtained Users of this information are encouraged to confirm the accuracy and applicability thereof with oth and treatment modalities are described on this website. The opinions and methods of diagnosis an rapidly as new information becomes available, and therefore the information in this website does n current thoughts or methods. The content of this website is provided for information only and is not i treatment or as a substitute for consultation with your own doctor or a specialist. address enquiries and should not be used for urgent or emergency requests, treatment of any knee inj confidential or medical information. If you have sustained a knee injury or have a medical c
7 seek appropriate medical advice from your local doctor. Any opinions or information, unle Vladimir Bobic, and in no way claim to represent the views of any other medical professionals or in and Spire Hospitals. Chester Knee Clinic will not be liable for any direct, indirect, consequential, spe loss or injury to persons which may occur by the user's reliance on any statements, information o Chester Knee Clinic is not responsible for the content of external websites.
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