Sports
On February 2, the groundhog told us that spring will arrive soon. But don’t fear – the sledding days are not yet over. If you are looking to maximize your snowmobiling adventures or to try the activity for the first time before the snow disappears, then this is for you.
Like any other activity, it is important to understand the risks and how to prevent injury. In this case I’m not talking about injuries from accidents, although that is still very important to take precautions to avoid. My focus is instead on the aches and pains you may experience throughout your body.
Snowmobiles have come a long way from the original 20 ton machine that was first designed for log hauling, with most modern machines weighing over 500 lbs and able to reach speeds of 110 mph (Heisler 2010). With prolonged time on the machine you are exposed to awkward positions for your upper body, long periods of sitting with a forward bent posture, and vibration stresses. Not to mention the heavy lifting, pulling, and pushing when you need to get out of a jam. Common aches and pains from riding are the low back, neck, shoulder and the occurrence of white-finger syndrome (Heisler 2010).
I’m not suggesting you quit your sport! There are certain factors that can be modified to prevent you from injury, and to keep you more comfortable.
A factor to the aches and strains is the ergonomics of a snowmobile. One of the most important parts to adjust is the steering bar (Rehn et al. 2005). Ideally it should be close enough to your body and have the grips oriented in a way so that your wrists aren’t bent, your shoulders aren’t hiked up and you do not have to reach so far forward. This will put you in a more comfortable posture for your upper limbs and your lower back, as well as lowering the grip force you need to use. Specific positions are to have your wrists neutral, elbows bent 60-70 degrees and if you have a seat back, for it to be tilted back 45 degrees (Heisler 2010). Grips should ideally be about 1.5” in diameter to lessen the grip strength required to steer (Heisler 2010). When looking at buying a snowmobile, also consider its seat suspension. Whole-body vibration, which will occur even on groomed trails, puts the discs in your back at risk for injury (Bovenzi and Hulshof 1999).
There are other factors to consider beyond just the ergonomics of your sled. Here are things you can do to prevent injuries:
Avoid sitting too long in poor posture: When you sit, you lose the normal curve in your low back. This is made worse by bending forward. The posture in combination with the machine’s vibration puts the discs at risk of injury. When possible, alter how you sit so that you back isn’t arched so much.
Wear appropriately warm mitts: Vibration of the upper limb, along with cold exposure, can contribute to the occurrence of “white-finger syndrome” which increases the chances of frostbite. It will also affect your ability to grip properly (Heisler 2010). To minimize this risk, stay warm!
Keep strong: Think of sledding as you would another sport – one that requires strength and endurance. Keep your body fit, and flexible, during the week to prepare you for the weekend adventures.
Listen to your body: If you’re getting fatigued, it’s time for a break. That is when you have a greater chance of adopting poor postures, or hurting yourself with the sudden jolts and turns.
And of course, listen to your body if you’re experiencing pain. Delayed onset of muscle soreness, DOMS, has been reported to last about 1-3 days after snowmobiling (Heisler 2010), but if it extends beyond that, or if you’re finding you’re getting weak (a loss of grip strength is commonly reported) – seek out care from a health professional.
Enjoy the rest of the sledding season, have fun, and stay injury-free!
Foot and Ankle
There are four main ligaments that provide stability of the knee joint – the medial and lateral collateral ligaments on either side of the knee, and criss-crossing deep inside the joint are the posterior and anterior cruciate ligaments. The anterior cruciate ligament (ACL) is a thick ligament that attaches from the lower surface of the femur (thigh bone) onto the upper surface of the tibia (shin bone) in a way that will resist the tibia from slipping too far forward or rotating too far inwards on the femur. If – as can happen during sports that involve twisting, jumping, or pivoting – the knee twists too far with a lot of force, then part of all of the ACL can be torn.
ACL injuries are one of the most common knee injuries and they are managed in different ways depending on the severity of the injury and the age and activity level of the person.
Non-operative management consists of physiotherapy treatment with focus on reducing the inflammation and working through a strengthening protocol in order for the muscles around the knee to support the knee joint as much as possible. In these cases the surrounding muscle support is crucial as the knee will be lacking some stability if the ACL hasn’t been repaired. A knee brace may also be useful to provide extra support once the person is taking on more activity at the end of the rehab and beyond.
In many cases surgery will be required. The repair is normally made with a graft taken from the persons own hamstring or patellar tendon. Once the surgery is done, the rehab begins immediately. Whereas in the past the knee might have been put in a cast and rested, current protocols involve early weight bearing and range of motion exercises. It is very important to regain the knee range of motion early on otherwise it can be hard to progress and achieve goals further down the line.
A strengthening program, developed by your physiotherapist, will be started post operatively in order to begin to regain some of the knee strength and stability. The strengthening program for ACL reconstruction rehab is quite specific because the exercises need to strengthen all of the important muscles without placing too much stress on the healing ACL graft. A gradual progression of strengthening is done, beginning with simple light exercises and building up until eventually more complex exercises that are specific to your sport can be achieved.
By the end of the rehab the goal is to have sufficient strength in the muscles and ACL graft to give the knee the functional stability it needs to cope with the demands placed on it during activity. A return to sport is typically achieved in around 9-12 months following surgery.
Foot and Ankle
You wake up, the sun is shining, you climb out of bed and realize that your knee feels stiff. Again. After about ten minutes the stiffness eases and you head out for your morning walk. You notice that you can’t walk as fast as you could a couple months ago, and you have started shortening your walking distance due to the pain in your knee. Over the last month you have also noticed weakness in the muscles around the knee, reduced balance and grinding in the knee joint with movement.
Does any of that sound familiar? If so, you may have knee osteoarthritis. Osteoarthritis is a common degenerative condition that often involves the spine, hip and knee joints. When the articular cartilage between two bones breaks down, the underlying bone becomes exposed, which can be painful. An x-ray of the knee can help confirm the diagnosis of osteoarthritis, although symptoms do not always correlate with the degree of degenerative change seen on x-ray.
While it is usually not possible to identify the exact cause of this condition, factors which increase the risk of osteoarthritis include increasing age, a family history of osteoarthritis, obesity, a previous injury that has caused trauma to the joint and a sport or occupation that has involved repetitive stress on the knee joint over an extended period of time.
There are a wide range of physiotherapy treatments that can be quite effective at alleviating pain, reducing stiffness and improving range of motion, flexibility, muscle strength, balance and overall function. These treatments may include education, manual therapy, exercise prescription, modalities and use of a gait aid, such as a cane.
Exercise can be quite beneficial to help reduce symptoms and improve function. Consider your physiotherapist your exercise expert who can put together a home exercise program for you which includes specific exercises for range of motion, stretching, strengthening, aerobic exercise and balance training. As well, swimming and/or cycling are often well tolerated and help improve aerobic conditioning, joint lubrication and can help with weight management.
Manual therapy involves different hands on techniques performed by your physiotherapist which can help reduce stiffness and improve range of motion. We will often measure knee range of motion before and after treatment and between physiotherapy visits to determine how effective the treatment is for you. Modalities, which include heat, cold, electrical stimulation, ultrasound and acupuncture may also help to reduce symptoms. Ultimately, our goal is to reduce pain and improve function and the treatment you choose will depend on your goals, the severity of your symptoms and your current level of function.
Shoulders
It’s well known that pain in your neck, radiating down the arm can be a result of an irritated nerve root in your neck. What’s often overlooked, is that compression can occur further down the nerve continuum as they bundle together and exit the neck. These nerve bundles are partnered with major blood vessels as they travel through the shoulder and further into the upper arm. As they exit the neck, these neurovascular structures become susceptible to compression. Knowing this, we now consider the possibility of compression of not just the nerves, but the blood vessels too.
Thoracic Outlet Syndrome (TOS) is a complex presentation of signs and symptoms that result from compression of the neurovascular bundle as it emerges from the thorax and enters the upper limb. The thoracic outlet is the space bordered by the scalene muscles, first rib, and clavicle. The neurovascular structures pass from the neck and thorax into the axilla (arm pit region), and continue to branch further into the upper arm, to forearm, and hand. TOS is more common in women, particularly those with poor muscular development, poor posture, or both.
In the office, we assess and diagnose injuries related to repetitive upper extremity use or trauma. Swimming, baseball, tennis, and volleyball, are common sports that may bring on symptoms of TOS. Functional and biomechanical assessment of these patients who engage in repetitive and extreme abduction (out to side) and external rotation (outward rotation) of the shoulder, often demonstrate TOS signs and symptoms. Other patient populations who may develop TOS include those who are in sustained poor postures in their activities of daily living and work, and tend to develop shortened chest and shoulder structures, and weak/lengthened neck and upper back structures.
Anatomically, TOS can be a result of bony and soft tissue factors. Bony causes often involve rudimentary or “extra” ribs which increases the risk of compression, e.g. cervical rib. Soft tissue factors can include muscular tightness or hypertrophy related to sport. Trauma or mechanical stress to the neck, shoulders, upper back, or upper extremities can bring on signs and symptoms.
The common presentation of TOS includes a high degree of variability. Most people describe a vague and often confusing source. Pain can originate from the root of the neck and radiate to the entire arm. Strength loss can occur. Depending on the structures being compressed, people can also experience numbness, swelling, tingling in the arm and hand, heaviness in the arm, loss of movement, rapid fatigue, dull aching, cold and discolouration.
Our challenge as physical therapists is to distinguish by specific testing, whether or not you present with a true TOS. From the comprehensive list of signs and symptoms above, we can easily see how TOS can mimic neck injury (disc, nerve root pain), and even shoulder and elbow injury.
Physical therapy treatment addresses postural abnormalities and muscle imbalance, in order to assist in alleviating symptoms by relieving pressure on the thoracic outlet. We work to minimize tension directly around the nerve entrapment points. Manual therapy and exercise strategies would assist in correcting muscles that have shortened or lengthened because of poor posture. It is also important to take into consideration a patient’s activities of daily living, work environment, sleep positions, etc. Surgical intervention is often considered in severe cases of blood vessel compression and compromise.
Symptoms often resolve with conservative physical therapy in 90% of individuals, with good ability to return to previous lifestyle with little difficulty.
Vince Cunanan is a registered physiotherapist and associate at Sun City Physiotherapy. He can be contacted at our Downtown St. Paul Street location or email downtown@suncityphysiotherapy.com
Shoulders
Ever had pain radiating from your neck to your shoulder and down your arm? Perhaps losing strength in your arm or a feeling of numbness or tingling in the fingers? Chances are that you have irritated a nerve in your neck and that nerve is sending these painful or distressing symptoms down your arm.
The neck, or cervical spine, is comprised of the top seven vertebrae of the spine. These vertebrae form a solid yet fluid structure – solid to encase the spinal cord which runs down the centre of the spine, and fluid as the vertebrae move on each other as the neck bends and rotates. In between each vertebrae there is a opening called the intervertebral foramen, and it is here where the nerves that branch off the spinal cord exit the spine. These are called the nerve roots and the ones from the lower half of the cervical spine combine to form a group of nerves that travel into the arm, giving us sensation and muscle power.
Each nerve will follow a specific pathway from the neck to the arm, and nerves like to have space to slide and glide along that pathway. If at any point the nerve is compressed or pinched, then the nerve signal can be affected and as a result we can experience some of the symptoms mentioned above – pain, altered sensation, or reduced power in the arm.
There are certain areas where the nerve is more likely to become pinched in the neck. The intervertebral foramen that it travels through to exit the spine is the first. Anything that encroaches on the foramen such as a disc bulge or a bone spur can reduce the space available for the nerve causing compression. Then once it is through the foramen, the nerve travels between some tightly packed muscles in the neck so any increase in tension in these muscles can also cause compression of the nerve as it moves through this area.
If these symptoms ring a bell with you, a physiotherapist can perform a series of tests that will determine exactly which nerve is irritated and exactly where it is getting pinched. The location of your symptoms or the specific muscles that have lost power will help to determine the area of your neck that needs to be treated. There are several treatment options to resolve your symptoms, and which treatment will be most effective for you will depend on the findings from the assessment. Some common techniques used to treat cervical radiculopathy are manual therapy to create more space for the nerve, traction to take the pressure off the nerve, and acupuncture to stimulate the nerve in order to fully restore the nerve signal. Once there is no compression on the nerve and any inflammation around it has settled, then your arm symptoms should subside and full function should be restored.
