Shin splints is not a specific injury itself but is the common name often given to pain at the front of the lower leg of which there may be a number of causes. The most common cause is medial tibial stress syndrome.
Here we explain the symptoms, treatment and rehabilitation of medial tibial stress syndrome to cure and prevent it recurring.
Shin splints symptoms
Symptoms of medial tibial stress syndrome often come on gradually and consist of pain over the inside lower part of the tibia or shin bone. There may be pain at the start of exercise which often eases as exercise continues only to come back worse later in the training session or afterwards.
Pain in the shin is often worse first thing in the morning but may ease off over time as the tissues warm up, only to become painful again later on in the day. When pressing in (palpating) along the shin, tenderness, swelling, lumps and bumps may be felt along the inside of the bone, particularly in more chronic cases. This is because new bone growth has occurred in response to repeated trauma. Occasionally in severe cases reddening of the skin over the inside of the leg from acute inflammation may be seen.
Stress fracture - Symptoms of a tibia stress fracture are similar to medial tibial stress syndrome, however, pain is acute or sharp and along the inside of the shin bone and stays the same or gets worse with exercise. Again it will be very tender when pressing in along the inside of the shin bone.
Chronic compartment syndrome - A compartment syndrome occurs when the muscle becomes too large for the sheath that surrounds it causing increased pressure and pain. Typically symptoms will not include pain at rest. An aching type pain gradually gets worse with exercise. Pain comes on at a specific point into a run and is relieved with rest. There will be little or no tenderness at rest, unless it affects the large muscle on the outside of the shin.
Popliteal artery entrapment - Symptoms of popliteal artery entrapment consist of pain mostly in the calf muscles at the back of the shin bone. The pain gets worse with exercise, especially going up on your toes or jumping. The athletes pulse is diminished when plantar flexing the foot (pointing the foot downwards).
Read more on assessment and diagnosis of shin pain.
Causes & anatomy
The lower leg consists of tibia and fibula bones. The tibia is the larger weight bearing bone and the fibula is the thinner one to the outside of it. The function of the smaller fibula bones is mostly for muscles attachment to aid movement. The tibia or shin bone bears the bodies weight when running and jumping. Large forces are transmitted thought the tibia bone and the soft tissues attached to it.
The tibia bone has a thin sheath on the outside of the bone called the periostium. Medial tibial stress syndrome or medial tibial traction periostitis occurs when the soft tissues (muscles and tendons) pull on the periosteum or sheath surrounding the shin bone causing pain and inflammation.
It is an over use injury resulting from too much running or jumping and not enough recovery time. Although too much running, jumping or sprinting is the obvious cause, there are a number of factors which can increase the likelihood of shin pain developing such as increasing running mileage too quickly, excessive training on hard surfaces or running on your toes such as in sprint training. Certain biomechanical factors can also increase the risk of developing medial tibial stress syndrome:
Overpronation occurs when the foot rolls inwards too much flattening the arch of the foot and causing the lower leg to rotate inwards. This in turn increases the stress on the soft tissues of the lower leg resulting in pain and inflammation.
Over supination is where the foot rolls outwards too much. If you think you have suspected biomechanical issues then a professional can do gait analysis tests either with a treadmill or using force plates to determine this and whether corrective orthotic inserts for your shoes are needed.
Inadequate footwear such as the wrong type of shoe for your running style or running shoes that are just too old and have lost their support and cushioning can cause injury. Over pronators may require a running shoe with a firmer midsole on the inside to reduce the amount of rolling in (known as a stability shoe or motion control shoe). Supinators usually require a neutral shoe with plenty of cushioning. A specialist running shop can advise.
Increasing training too quickly is one of the more common causes of shin splints. Running on hard surfaces or on your toes as in sprinting and generally doing too much too soon will increase the risk of injury.
Poor flexibility (tight calf muscles) at the ankle can cause increased stress on the soft tissues, muscles and tendons of the lower leg when running. The calf muscles and in particular the tibialis posterior muscle may need stretching.
Shin splints treatment
Treating shin splints involves reducing pain and inflammation, identifying and correcting training errors and biomechanical problems and restoring muscles to their original condition through stretching, exercises and massage. The full rehabilitation process may take anywhere from 3 weeks to 12 weeks.
Self help treatment
Apply the PRICE principles of protection, rest, ice, compression and elevation to reduce initial pain and inflammation. Apply a cold therapy and compression wrap to the painful area of the shin for 10 minutes every hour initially for the first 24 to 48 hours, reducing frequency to 3 or 4 times a day as symptoms improve. The tissues are very superficial so ice does not need to be applied for longer than 10 minutes. Do not apply ice directly to the skin as it may burn. Either wrap ice in a wet tea towel or use a commercially available cold pack.
Rest is important and often overlooked. This means resting from any activity that makes the condition worse such as running, jumping and other high impact sports. Very severe shin splints may require complete rest for a few days but you should aim to maintain an exercise routine by switching to swimming, cycling, cross trainer, rowing machines, step machines and other non impact equipment.
Taping - as most people have to be on their feet during the day it may not be possible to rest the tissues of the lower leg as much as required. Shin splints taping can instantly relieve symptoms in most patients can be applied all the time until pain has gone and then occasionally during exercise as activities levels are built up. The simple taping technique supports the muscles of the lower leg by pulling them towards the shin bone reducing traction forces at the most painful part and allowing the soft tissues (muscle, tendon etc) to rest.
Protect and support the area with a shin splint sleeve or compression support. This will help keep the muscles warm and supple as well as providing support to the inflamed tissues. Wearing shock absorbing insoles in shoes particularly if you run or walk on hard surfaces in poorly cushioned shoes will help reduce the shock on the lower leg. Switch to wearing softer training shoes rather than hard leather work shoes if possible until symptoms go.
Stretching exercises - If not painful to do so, stretch the muscles of the lower muscles of the lower leg. In particular calf stretching exercises to release tension in the calf and peroneal muscles.
Identify possible causes - It is a common complaint that athletes will rest until their shin pain goes only for it to return once training resumes again. This is often because the underlying causes are not addressed. Keep a training diary so you can look back and assess if the training load is too high. Get a full biomechanical assessment to identiy any problems with the feet which may be contributing and make sure you have the right shoes in good condition.
What can a professional do?
Medication - A doctor may prescribe anti-inflammatory medication e.g. ibuprofen to help reduce pain and inflammation. Although this should not be relied on as a long term solution or excuse not to rest. Asthmatics should not take Ibuprofen.
Sports massage & myofascial release - After the first 3 days massage can be used to reduce tension in the muscles of the lower leg which may be causing traction on the bone. Removing any tight lumps, bumps and knots as well as encouraging blood flow may aid the healing process. This should initially be quite light and avoid the inflamed periostium close to the bone. Gradually become deeper over subsequent treatments as pain eases.
Massage techniques should include sustained pressure along the length of the muscles as well as transverse frictions. It is important the massage therapist avoids the bone as this can make symptoms worse. However, it is important to avoid the bone as massage for shin pain done incorrectly may increase inflammation and pain.
Surgery - If all conservative treatment fails then surgery is an option, although this is rare.
Stretching exercises should be done both with the knee straight and bent to target both the gastrocnemius muscle and the deeper soleus muscle. Shin stretches should also be done if pain allows.
Strengthening exercises may also be required although being an overuse injury it is rest and stretching which should be the priority. A gradual return to full fitness is important. Calf raises and toe raise exercises can help get the muscles of the lower leg working again. Read more on exercises for shin splints.
When walking has been pain-free for 2 weeks, you can begin running, building up gradually. Apply tape to the shin to support it for the first few runs and apply ice afterwards. Stretch properly before and after each training session.