I want to begin this article by going right into a new study that will help us understand injection treatments for Plantar fasciitis.
It is published in the The Journal of foot and ankle surgery and it comes from medical university researchers in Turkey.
Comparing the therapeutic effects of extracorporeal shock wave therapy, platelet-rich plasma injection, local corticosteroid injection, and prolotherapy for the treatment of chronic plantar fasciitis
There is so much here in this article we can share that can help you understand your treatment options. So let’s get to it.
- The researchers performed a randomized controlled prospective clinical study of 4 groups.
- The first group received extracorporeal shock wave therapy, (electric pulse therapy)
- the second group received prolotherapy,
- the third group received platelet-rich plasma injection,
- and the fourth group received a local corticosteroid injection.
- The study included 158 consecutive patients with a diagnosis of chronic plantar fasciitis with a symptomatic heel spur.
- The clinical outcomes were assessed using the visual analog scale (a pain scoring scale of 0-10) and Revised Foot Function Index (A questionnaire about foot disability and discomfort).
- The corticosteroid injection was more effective in the first 3 months but then its effectiveness all but disappeared
- The extracorporeal shock wave therapy was an effective treatment method in the first 6 months in regard to pain.
- The effect of prolotherapy and platelet-rich plasma was seen within 3 to 12 months; however, at the 36-month follow-up point, no differences were found among the 4 treatments.(1)
This study hits on many points that can help explain why cortisone and extracorporeal shock wave therapy are not long-term treatment options for chronic plantar fasciitis and how PRP and prolotherapy treatments provide longer relief. This study also gives us the ability to point out helpful treatment guidelines for you towards a more permanent solution to your foot pain.
Treatments with short-term or little relief value
It is easy to understand why a patient with chronic plantar fasciitis are frustrated. They are often given treatments that provide short-term relief but hurt their chances of long-term relief and the ability to return to activity.
- The first line of treatment is usually to recommend cutting back on the activity that is causing the pain.
- Massaging the foot with a tennis ball and application of ice are commonly recommended.
- Inject steroids (see above) into the foot or to prescribe anti-inflammatory medications in order to relieve the pain associated with the weakened plantar fascia.
- Shock wave therapy is often suggested.
- Often taping, orthotics, and night splints are used as well.
Cortisone shots and anti-inflammatory drugs have been shown to produce short-term pain relief benefit, but both result in long-term loss of function and even more chronic pain by actually inhibiting the healing process of soft tissues and accelerating cartilage degeneration. For example, cortisone will eventually weaken the fascia. If they are not strengthened, a painful heel spur will result.
Plantar Fasciopathy Research – Why is Cortisone still an option?
As in the study above, researchers are constantly trying to prove the effectiveness of one treatment over another to answer the simple question: What treatments work best for Plantar fasciitis and chronic plantar fasciopathy (disease of the plantar fascia)?
Researchers at the University of Northern Iowa wrote in the Journal of Sports Rehabilitation:
“For active individuals, plantar fasciitis is one of the most clinically diagnosed causes of heel pain. When conservative treatment fails, one of the next most commonly used treatments includes corticosteroid injections. Although plantar fasciitis has been identified as a degenerative condition, rather than inflammatory, corticosteroid injection is still commonly prescribed. . . “(2) They also concluded that PRP injections would be more effective a choice of treatment.
Doctors writing in the medical journal Rheumatology compared the effectiveness of a number of treatments. This included Platelet Rich Plasma Therapy, shock-wave therapy and corticosteroid injection.
The researchers discovered a trend that favored the PRP treatment. They noted that Platelet Rich Plasma Therapy, followed by shock-wave therapy, were best in providing relief from pain at 3 months over cortisone. Shock-wave therapy and PRP had similar probabilities of providing pain relief at 6 months.(3)
Doctors in the United Kingdom published comparative research for platelet-rich plasma versus corticosteroid injections in treating plantar fasciopathy. Writing in the journal International orthopaedics, the UK researchers noted: PRP injections are associated with improved pain and function scores at three-month follow-up when compared with corticosteroid injections.(4)
The beneficial effect of prolotherapy and platelet-rich plasma was seen within 3 to 12 months
Plantar Fasciopathy Research – Why are we still thinking PRP is a “one-shot wonder?”
Most times studies on PRP effectiveness even the favorable ones – rely on a single dose treatment and a hope for a “one-shot” wonder. For many suffering from chronic plantar fasciitis, one-shot wonders typically do not provide the more permanent relief the patient is looking for. But as this study points out the potential for PRP is great – when administered by an experienced provider.
As in the above study, doctors writing in British Medical Bulletin evaluated the evidence for platelet-rich plasma injection as a treatment for chronic plantar fasciopathy. What they found was PRP for treating chronic plantar fasciopathy shows promising results, and appears safe. However, the number of studies available is limited to give definite positive results and they would like to see more studies performed.(5)
In other research, doctors say they cant tell if PRP works because there is no standardized treatment and that based on “one-shot wonders” it doesn’t appear to be effective over other treatments.(6) Enough so that some researchers want cortisone under ultrasound guidance restored as the primary treatment for plantar fasciitis,(7) despite conflicting research as reported above and here:
Recent research contradicts that sentiment of restoring cortisone as a primary treatment for plantar fasciopathy. Doctors in the UK say “PRP is as effective as Steroid injection at achieving symptom relief at 3 and 6 months after injection, for the treatment of plantar fasciitis, but unlike Steroid, its effect does not wear off with time. At 12 months, PRP is significantly more effective than Steroid, making it better and more durable than cortisone injection.”(8)
Further research in the Singapore medical journal suggests it is evident that the effects of corticosteroid injections are usually short-term, lasting 4-12 weeks in duration. Complications and side effects such as plantar fascia rupture are uncommon, but physicians need to weigh the treatment benefits against such risks.(9)
Prolotherapy or PRP for plantar fasciitis?
Prolotherapy, like PRP, repairs plantar fasciitis by strengthening the fascia and providing support to the arch of the foot. Prolotherapy is a treatment that regenerates and strengthens the weakened structures, such as the weakened plantar fascia ligament.
When a patient comes in with plantar fasciitis, an evaluation is made as to what type of treatments will likely benefit the patient most. Often times we will look for the simplest treatment. In many cases, simple dextrose Prolotherapy will do the trick. Sometimes a stronger proliferant solution like PRP is required.
Korean doctors writing in PM & R : the journal of injury, function, and rehabilitation compared Prolotherapy to PRP in the treatment of chronic recalcitrant plantar fasciitis. Led by the Korea National Sport University, the researchers found all patients in both the Prolotherapy group and the PRP group showed significant improvements. They concluded: “Each treatment seems to be effective for chronic recalcitrant plantar fasciitis, expanding the treatment options for patients in whom conservative care has failed. PRP treatment also may lead to a better initial improvement in function compared with dextrose Prolotherapy treatment.”(10)
Prolotherapy treatments need to focus on the spring ligament which is also called the plantarcalcaneonavicular ligament. This is one of the most important ligaments in the arch that supports the arch. But whether someone has a high arch, normal arch, or flat arch, or pes planus, if they have pain and tenderness to palpation, typically they’ll respond great to Prolotherapy because Prolotherapy stimulates the repair of the injured areas. It causes the proliferation of injured soft tissue so they repair.
Plantar fasciitis is more of a misnomer since “itis” means inflammation, and most patients who have been diagnosed with plantar fasciitis actually have a weakened, degenerated plantar fascia.
True inflamed tissue is hot to the touch, red, and swollen. Thus, the anti-inflammatory treatments do not promote repair and healing of the fascia because most cases of this type of foot pain are not truly inflammatory.
Now that the evidence for PRP and Prolotherapy over cortisone has been presented, let’s go back and discuss the problem of plantar fasciitis.
What causes plantar fasciitis?
Plantar fasciitis is one of the most common causes of heel pain. Plantar fasciitis involves pain and inflammation of the plantar fascia, a flat band of tough tissue supporting the arch of the foot that runs from the heel to the base of the toes. It looks sort of like a series of fat rubber bands, but the plantar fascia is made of collagen which is rigid and non-stretchy. Plantar fasciitis is common in middle-aged people but also occurs in younger people who are on their feet a lot. When the plantar fascia is strained, it becomes weak, swollen, and irritated.
Repeated microscopic tears of the plantar fascia cause pain that is most notable in the morning after getting out of bed. Putting weight on the injured area after periods of rest (such as sleep) will cause stress on the area and a more sudden, aching pain. Once the foot loosens up, the pain generally decreases. The pain may return, however, after long periods of standing, or after another period of rest. Plantar fasciitis may also be called “heel spurs,” but this is not always accurate because bony growths on the heel may or may not be involved.
The relationship between plantar calcaneal spur (Heel Spurs) and Plantar fasciitis
In the medical journal Foot and Ankle Injury, doctors in the United Kingdom point out the confusion foot specialists face when understanding the relationship between a heel spur and plantar fasciitis. Here is what they write:
- Plantar fasciitis is a common diagnosis in patients presenting with heel pain.
- The presence of co-existing calcaneal spurs has often been reported but confusion exists as to whether it is a casual or significant association. (In other words, does plantar fasciitis cause heel spurs?)
So how did this research team come up with the answer? By comparing soft tissue ligament instability. Does weakness in the soft tissue cause bone formation. This website is filled with research that it does, of course, do so.
This is what the researchers did:
- They looked at lateral heel radiographs of nineteen patients with a diagnosis of plantar fasciitis and nineteen comparison subjects with a lateral ankle ligament sprain matched for age and sex, were reviewed independently by two observers.
- There was a significantly higher prevalence of heel spurs in the plantar fasciitis cases than the comparison group (89% versus 32%.)(11)
Studies like these give fantastic examples of the problems of joint instability and the body’s way of dealing with it at the point of the problem.
- Both the lateral ankle ligament sprain and the plantar fasciitis would cause pain and instability in the heel region.
- However, the way to stabilize the heel when plantar fasciitis was the problem was to grow a heel spur, albeit a painful one in 89% of the patients. When the ankle was the problem, the body grew a heel spur 32% of the time. The other two-thirds of incidence, the body figured out a different way of dealing with the chronic ankle sprain and instability – chronic inflammation.
Note: Heel spurs are due to weakened ligamentous support of the plantar fascia. Prolotherapy to strengthen the plantar fascia will eliminate chronic heel pain. There is generally not a need for heel spurs to be surgically removed after the supportive ligaments and plantar fascia have been repaired.
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