Plantar fasciitis is one of the most common causes of heel pain. It is defined as inflammation of the plantar fascia due to repetitive micro-trauma from excessive traction and/or loading forces. Plantar fasciitis is also typically not just an acute inflammatory condition. It is now recognised as more of a chronic degenerative condition and as such could be renamed plantar fasciopathy.
Your plantar fascia is on the underside of your foot and is shaped like bow string. It is a thick aponeurosis (a strong fibrous tissue) that connects the heel to the toes. The orientation of the plantar fascia helps maintain the medial longitudinal arch of the foot when walking. It also helps to maintain the appropriate timing of pronation and supination.
Pronation is the normal movement that occurs at your foot whenever you walk or run. As you take a step, your heel strikes the ground first, then your foot naturally ‘rolls over’ from the outside portion of your foot to the inside portion of your foot. Sometimes people over pronate, others under-pronate (also known as excess supination).
Plantar fasciitis typically causes a stabbing like pain in the bottom of your foot near the heel. The pain is usually at its worst with the first few steps after rising from sleep. It can also be triggered by long periods of standing or when you get up after sitting for lengthy periods. The pain is usually worse after exercise, not during it.
Your plantar fascia supports the arch of your foot and absorbs shock when you walk and run. If tension and stress on this bowstring shaped fascia becomes too great, small tears can occur. Repeated stretching and tearing can irritate or inflame the fascia. Often, the specific cause of plantar fasciitis can remain unclear.
Most commonly, individuals report plantar fasciitis pain after a period of increased or unaccustomed activity. Especially after a period of inactivity. It can happen after completing a more vigorous activity than you are accustomed to or increasing your running/walking mileage. It can simply be increasing the time spent on your feet every day at work. Wearing shoes with soft soles and poor arch support can also be a factor.
Even though plantar fasciitis can develop without a known cause you are at higher risk if you fit into the following categories.
Plantar fasciitis is diagnosed via your history and physical examination. Imaging is usually not necessary. Your GP may suggest an X-ray or MRI to rule out other factors such as a stress fracture. Especially if you are not responding to conservative treatment. Imaging will sometimes reveal a bone spur on the heel. This can be due to excessive tension from the plantar fascia causing periosteal lifting of the bone. That is, the body is responding to the strain by laying down extra bone.This is often a symptom of the plantar fasciitis and not a cause.
It is worth noting that many people who have bone spurs on their heels have no heel pain.
The good news is that the vast majority of those diagnosed with plantar fasciitis will recover in 6-12 months with conservative treatment such as rest, icing, anti-inflammatories, exercises and stretching as described below.
Easy to do and have been shown to provide short-term pain relief. Calf stretching is important because not only do tight calves limit ankle range of motion but there is also a soft tissue connection between the Achilles tendon and the plantar fascia. So tight claves can lead to tight a plantar fascia. You should stretch at least two to three times per day for around 20-30 seconds. The following videos show how to stretch both your calf muscles and how to stretch and massage your plantar fascia.
Physiotherapists can help with improving ankle range of motion, stretching and releasing tight calf muscles as well as taping and shock wave treatments.
Physios can also assist with orthotics or can refer you to a podiatrist. Night splints can help if you have had symptoms for longer than 6 months. When you sleep, your toes are often in a slightly pointed down position; meaning your calf muscles are in a shortened position. This is counterproductive to the stretching that you are supposed to be doing during the day. Night splints therefore can help because they keep the foot in a neutral position, helping to limit shortening of the calf muscles. They may also decrease the pain that is common with the first steps in the morning.
For difficult cases of plantar fasciitis a corticosteroid injection may help alleviate symptoms related to inflammation and pain for a short period of time. Bear in mind that repeated injections are generally not recommended to address your heel pain.
Platelet-rich plasma (PRP) injections are obtained from your own blood. They can then be injected into the plantar fascia to promote tissue healing. Again, this procedure has mixed results.
Maintain a healthy weight and choose supportive shoes, remembering to replace old sneakers before they stop supporting and cushioning your feet.
Make calf and foot exercises and stretches part of your exercise routine. Ice if you start to feel heel pain and reduce your weight bearing activity to give the plantar fascia time to heal. Swimming and other low-impact activities can let you exercise without worsening your heel pain. See your Physio for further advice or assistance with your exercises.