Fig. 36.1
MRI, sagittal view: partial plantar fascia rupture with bone edema
Fig. 36.2
MRI, sagittal view; plantar fasciitis with thickened fascia
Electromyography may be helpful if a neurogenic cause is suspected such as S1 nerve root entrapment, tarsal tunnel syndrome, or entrapment of the lateral plantar nerve.
Blood tests, such as a white cell count, human leucocyte antigen B27, antinuclear antibodies, and uric acid, may be needed, particularly in younger patients or with those patients who have bilateral heel pain to distinguish rheumatoid arthritis, Reiter syndrome, ankylosing spondylitis, and so on.
36.6 Conservative Treatment
36.6.1 Nonsteroidal Anti-Inflammatory Drugs (NSAIDs)
Histologically, PF is not an inflammatory disease but mainly degenerative change. However, NSAIDs are sometimes an effective treatment. In a meta-analysis study, it was found that the NSAIDs group had improved pain relief and disability compared with placebo in short to midterm (Donley et al. 2007).
36.6.2 Stretching
Stretching is an easy treatment option. A randomized controlled trial has investigated the role of specific Achilles tendon versus plantar fascia stretching exercises in patients with established chronic plantar fasciitis. (DiGiovanni et al. 2003) This involved an eight-week program supplemented by celecoxib for the first three weeks. The short-term outcome demonstrated superior results relating to pain using the Foot Function Index in the plantar fascia-specific stretching group compared with the Achilles stretching group. The 2-year follow-up via questionnaire demonstrated 94% of respondents reported decreased pain, and 92% reported total satisfaction or satisfaction with minor reservations except late stage (DiGiovanni et al. 2006).
36.6.3 Low Dye Taping
Low dye taping is often an effective treatment modality in mild to moderate cases. The strapping uses adhesive tape to immobilize the foot and decreases the distance between the origin and insertion of the plantar fascia, thus relieving plantar strain. Tape will loosen in time, often quickly, and may prove less effective in severe cases. Relief with plantar support by strapping often gives a good indication of the efficacy of orthosis in PF patient (Yale 1974).
36.6.4 Orthotic Devices
Night splints hold the foot in a neutral position, preventing the contracture of the fascia during sleep, which helps to alleviate symptoms in the morning. However, there has been no randomized controlled trial to prove that symptoms are alleviated. Heel inserts are quite popular and can be beneficial in relieving heel pain. Wolgin et al. showed that after six months, 82% of patients had responded to time and conservative therapy (Snook and Chrisman 1972; Wolgin et al. 1994). Orthosis is very good treatment for PF, it is reported that only 1–2% of PF required surgical intervention (Furey 1975).
36.6.5 Extracorporeal Shockwave Therapy (ESWT)
ESWT in the treatment of PF has reported success rate ranging from 34 to 88% (Chen et al. 2001; Weil et al. 2002). Mechanism of ESWT is still unclear, but it is believed that the shockwaves cause micro-disruption of the thickened plantar fascia, resulting in an inflammatory response, revascularization, and recruitment of growth factors and therefore a soft tissue reparative response (Ogden et al. 2004). Before, ESWT was considered as an end-stage treatment for those patients who have failed conservative measures and are reluctant to have open surgery (Hammer et al. 2002; Wang et al. 2002). However, double-blind randomized controlled trial showed radial ESWT to be better than placebo in recalcitrant patients (Gerdesmeyer et al. 2008). Moreover meta-analysis revealed that the short-term pain relief and functional outcomes of this treatment are satisfactory (Yin et al. 2014). Radwan et al. reported that the clinical results of ESWT are comparable with those of endoscopic plantar fasciotomy for resistant PF at 3 weeks, 3 months, and 1 year postoperation (Radwan et al. 2012). Thus, ESWT can be a useful noninvasive treatment for resistant PF and leads to reduce the necessity for surgical intervention. Further studies focused on the medium-and-long term are necessary to make sure the importance of ESWT.
36.7 Injection Therapy
- 1.
Steroid injections
Steroid injections are often effective in the short term (Crawford et al. 1999) although they have risks of fat pad atrophy and occasionally, rupture of the plantar fascia (Acevedo and Beskin 1998). One case series of six athletes with rupture of the plantar fascia noted five had previously received steroid injections (Leach et al. 1978).
- 2.
Platelet-rich plasma (PRP)
PRP has been proposed as a potential treatment for PF. A prospective randomized study revealed that PRP was more effective and durable than steroid injection for the treatment of resistant PF (Monto 2014). PRP is also effective in long term; however, the indication must be considered with its cost-effectiveness.
- 3.
Botulinum toxin
The effect of botulinum toxin injection for PF has shown apparently good effect; however, actually it seems not to be often used clinically (Tsikopoulos and Vasiliadis 2016).
- 4.
Dehydrated human amniotic membrane
Konstantinos et al. reported a systematic review and network meta-analysis of 22 randomized controlled trials of injection therapy for PF (Tsikopoulos and Vasiliadis 2016). The injection therapies included as follows: corticosteroids, BTX-A, autologous whole blood, placebo, platelet-rich plasma, cryopreserved human amniotic membrane, micronized dehydrated human amniotic/chorionic membrane, dextrose prolotherapy, sham dry needling, and polydeoxyribonucleotide. This report concluded that the dehydrated amniotic membrane injection was the highest probability of being superior to placebo injection over 8 weeks and that for pain relief. Hall et al. reported the efficiency to inject guided by echography because the accuracy of US guidance is greater than that of palpation guidance; therefore, injection therapy may have more effective possibility (Hall 2013).
36.8 Surgical Treatment
When conservative management fails, which occurs in approximately 1–10% of patients, surgical options should be considered. Symptoms should be present for more than 6 months before surgery should be discussed. It is still unclear that which procedures should be selected, because there are many reports about surgical intervention for PF, but there is no evidence from randomized control trials to support surgery.
36.9 Open Plantar Fasciotomy
Open plantar fasciotomy allows for release of the tight plantar fascial bands. Open surgery has risks; approximately 25% of patients will still experience heel pain after the surgery (Buchbinder 2004). Over-release of the plantar fascia may lead to flatfoot complications. Nerve entrapments can occur, as well as pain along the scar. Contompasis (1974) performed a 3 year retrospective study of 126 surgeries for PF. Plantar fascial release provided 36% satisfactory relief (Contompasis 1974). A combination of fascial release and spur resection allowed 44.3% to have complete resolution of pain and 45.2% to have improvement in pain, whereas 10.5% had no relief.
36.10 Endoscopic Plantar Fasciotomy
The first report about endoscopic plantar fasciotomy (EPF) is by Barrett SL et al. (Barrett and Day 1991), and after that, EPF has become more popular because of its minimally invasive nature and visualization of the fascia. Basically it minimizes complications and recovery time compared with open procedures.
There are two approaches of EPF, superficial and deep fascia approach. The first method Barret et al. reported was superficial fascia approach; after that, Blanco et al. reported deep-fascia approach which has comparative results with superficial approach (Blanco et al. 2001). Komastu et al. reported that deep-fascia approach had advantages to visualize calcaneal spurs and resection of them (Komatsu et al. 2011). Whichever taking the approach, the superficial and deep layers of the medial band of the plantar fascia are released, and the width of resection is approximately halfway across the fascia (Hogan et al. 2004). Satisfaction in relief of heel pain and clinical results are superior to open procedures.
36.11 Echo-Guided Plantar Fasciotomy
Cadaveric preliminary studies proved that plantar fasciotomy can be efficiently and safely performed under US control. The portal has to be medial at the end of the plantar skin on the alignment of the sonograph. The US control has the advantage to be based on the soft tissue (to the opposite of the fluoroscan) and allow also to see structures that are not dissected like the nerve and the artery (to the opposite of the endoscopic technique) (Figs. 36.3, 36.4, and 36.5).
Fig. 36.3
Landmarks and portals for plantar fasciotomy under ultrasonographic control
Fig. 36.4
Ultrasonographic plantar fascia visualization and fasciotomy
Fig. 36.5
Control of the quality of plantar fasciotomy under US control
36.12 Gastrocnemius Resection
Isolated gastrocnemius tightness has been associated with failure of conservative treatments (Patel and DiGiovanni 2011). Plantar fascia tension was directly proportional to Achilles tendon tension on cadavers in dynamic gait stimulator (Erdimir et al. 2004). Carlson et al. found that increasing tension within Achilles tendon caused increase in plantar fascia tension at four different angles of MPJ dorsiflexion (Erdimir et al. 2004). Biomechanics is believed to contribute to the onset of increasing plantar fascia tension through a decreased ankle joint range of motion. Reduced dorsiflexion of the ankle is the most important risk factor for the development of recalcitrant PF (Riddle et al. 2003). In a prospective study, the gastrocnemius resection has shown excellent results in the treatment of recalcitrant PF. Abbassian et al. reported that 17/21 patients diagnosed with PF experienced significant or total pain relief (Abbassian et al. 2012). Monteagudo et al. reported that the mean VAS pain score for a cohort of patients with PF that underwent proximal medial gastrocnemius release improved from 8.2 to 0.9. AOFAS scores improved and from 46 to 90 in this cohort as well. Moreover, open plantar fasciotomy compares poorly to PMGR about patient satisfaction (Monteagudo et al. 2013).
36.13 Radiofrequency Microtenotomy
As radiofrequency microtenotomy leads good results for Achilles tendinosis and other fasciitis, it has been proposed as a minimally invasive treatment modality for chronic PF (Akhtar et al. 2009; Shibuya et al. 2012). Radiofrequency microtenotomy induces epidermal destruction with minimal thermal damage, resulting in improved healing through controlled inflammation and focal angiogenesis (Shibuya et al. 2012). Radiofrequency microtenotomy was as effective at relieving pain, improving function, achieving patient satisfaction, and meeting patient expectations as plantar fasciotomy at 1 year follow-up (Chou et al. 2016).
36.14 Percutaneous Cryosurgery
Percutaneous cryosurgery uses subfreezing temperatures to produce analgesic effects. In a study by Cavazos et al., 77.4% of the patients were considered to have successful results after surgery. This procedure is still being studied for the effects on nerve and soft tissue after the freeze-thaw cycles (Cavazos et al. 2009).