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M77.5 Plantar Fasciitis – Causes, Symptoms & Treatment
M77.5 is the ICD-10 code for plantar fasciitis, a painful inflammation of the plantar fascia on the sole of the foot. It typically causes sharp heel pain, especially with the first steps in the morning.
Add as Preferred SourceThings worth knowing about "M77.5"
M77.5 is the ICD-10 code for plantar fasciitis, a painful inflammation of the plantar fascia on the sole of the foot. It typically causes sharp heel pain, especially with the first steps in the morning.
What is M77.5 – Plantar Fasciitis?
M77.5 is the ICD-10 diagnosis code for plantar fasciitis (also referred to as plantar fasciopathy). It is an overuse condition affecting the plantar fascia – a thick band of connective tissue running from the heel bone to the base of the toes, supporting the arch of the foot. Inflammation most commonly occurs at the attachment point of the fascia on the calcaneus (heel bone), causing characteristic pain in the heel and sole of the foot.
Causes
Plantar fasciitis develops due to chronic overload and repeated micro-trauma to the plantar fascia. Common causes and risk factors include:
- Overweight and obesity: Increased pressure on the foot arch
- Prolonged standing or walking: Especially on hard surfaces (occupational risk)
- Sports activities: Running, jogging, and jumping sports place significant strain on the fascia
- Foot deformities: Flat feet, high arches, or altered gait mechanics
- Inappropriate footwear: Insufficient cushioning or lack of arch support
- Tight calf muscles: Increased tension on the Achilles tendon and plantar fascia
- Age: Most commonly affects people between 40 and 60 years of age
Symptoms
The hallmark symptom of plantar fasciitis is a sharp or burning pain at the heel, which typically occurs in the following situations:
- Start-up pain: Intense pain with the first steps in the morning or after prolonged sitting
- Pain often decreases after a few minutes of movement, but may return with prolonged activity
- Tenderness on palpation of the inner heel
- Occasional pain along the entire sole of the foot
In some cases, a heel spur (bony outgrowth of the calcaneus) may develop, although it does not always cause symptoms.
Diagnosis
The diagnosis of M77.5 is typically made clinically. The physician takes a detailed medical history and examines the foot for characteristic pressure-pain points. Additional diagnostic tools may include:
- X-ray: Detection of heel spurs or exclusion of bony changes
- Ultrasound: Visualization of the plantar fascia to assess thickening or tears
- MRI (Magnetic Resonance Imaging): Used in unclear cases or when other causes are suspected (e.g., stress fracture)
Treatment
Treatment of plantar fasciitis is predominantly conservative and requires patience, as healing can take several months.
Conservative Measures
- Rest and activity modification: Avoiding activities that trigger pain
- Orthotic insoles and supportive footwear: Arch support and heel cushioning
- Stretching exercises: Targeted stretching of the plantar fascia and calf muscles
- Physiotherapy: Strengthening of the foot and lower leg muscles
- Night splints: Hold the foot in slight dorsiflexion during sleep to reduce morning start-up pain
- NSAIDs (non-steroidal anti-inflammatory drugs): Ibuprofen or naproxen for short-term pain relief and reduction of inflammation
Additional Treatment Options
- Corticosteroid injections: Local injections for persistent pain; prolonged use is discouraged due to risk of tissue damage
- Extracorporeal shock wave therapy (ESWT): Stimulates healing through acoustic waves; effective for chronic cases
- PRP therapy (platelet-rich plasma): Injection of growth factor-rich plasma to promote tissue regeneration
- Surgical treatment: Reserved for rare, treatment-resistant cases; involves partial release of the plantar fascia
Prognosis
The prognosis for plantar fasciitis is generally good with consistent treatment. Approximately 90% of patients experience resolution of symptoms within 6 to 12 months. Early intervention and regular exercise significantly improve the healing process.
References
- Plantar Fasciitis. In: StatPearls. National Library of Medicine (NLM) / NCBI, 2024. Available at: https://www.ncbi.nlm.nih.gov/books/NBK431073/
- Goff JD, Crawford R. Diagnosis and Treatment of Plantar Fasciitis. American Family Physician. 2011;84(6):676-682.
- Rhim HC, Kwon J, Park J, Borg-Stein J, Tenforde AS. A Systematic Review of Systematic Reviews on the Epidemiology, Evaluation, and Treatment of Plantar Fasciitis. Life (Basel). 2021;11(12):1287.
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