Shin Pain causes

Understanding Shin Pain 

The shin, or front of the lower leg, includes the tibia (shinbone), the fibula, muscles, tendons, and other connective tissues. Shin pain often develops due to overuse, excessive strain, or injury.

Common Shin Pain Causes

• Medial Tibial Stress Syndrome (MTSS)—“Shin Splints”. MTSS, commonly known as shin splints, results from repetitive stress on the tibia from nearby muscles. This overuse injury causes pain along the inner edge of the tibia. Generally, pain worsens at the beginning of exercise, warms up, and reduces as activity continues. 

• Stress Fractures of the tibia and fibula. Shin stress fractures are tiny hairline cracks in the tibia caused by repetitive impact. This injury results in sharp, localised pain that intensifies with activity. More severe stress fractures cause rest and night pain with limping. Stress fractures of the anterior cortex of the tibia are particularly problematic and need urgent attention. 

• Exertional Compartment Syndrome (ECS) occurs when muscles swell during exercise. This pressure restricts blood flow within the muscle compartments of the leg, resulting in pain, tightness, and sometimes numbness. Generally, pain only occurs during running and settles almost immediately when running stops. Other activities, such as walking and cycling, don’t cause pain in ECS. 

• Acute calf muscle tear. Tears of the medial gastrocnemius or soleus muscles can cause acute pain in the shin and calf. Generally, pain is acute and occurs during running. Gastrocnemius and soleus tears behave differently, so a precise diagnosis is critical. We also know that the location of a calf tear determines how long it takes to heal. 

• Tibialis Posterior Tendinopathy. This condition involves the overuse of the tibialis posterior muscle and tendon, which stabilises the foot arch. It can lead to pain along the lower leg, often radiating toward the inner ankle and foot.

• Peripheral Nerve Entrapment. Peripheral nerve entrapment, such as compression of the common peroneal, saphenous, superficial peroneal or sural nerve, can cause shin pain and numbness, tingling, or burning sensations along the outer or inner side of the shin and foot.

Less Common Shin Pain Causes

Less common conditions, such as knee or superior tibiofibular joint osteoarthritis, vascular narrowing like popliteal artery entrapment or iliac artery endofibrosis, referred pain from the lumbar spine, or calf muscle disease like McArdle’s disease, can cause shin pain.

Diagnosing Shin Pain

Your doctor will conduct a thorough assessment, including a comprehensive medical history, a physical examination, and relevant investigations. The following investigations can be helpful:

• X-rays help detect fractures or advanced bone stress.

• MRI is preferred for identifying stress fractures, muscle tears, compartment syndrome, or soft tissue injuries.

• Compartment Pressure Testing can be performed to measure pressure in the muscle compartments before and after exercise. Exertional compartment syndrome is diagnosed if pressures in the compartments are greater than 15 mmHg at rest or 20 mmHg post-exercise. 

• Duplex ultrasound helps detect blood vessel occlusions such as popliteal artery entrapment. 

Management and Treatment of Shin Pain Causes

The appropriate management and treatment for shin pain depend on the underlying cause and severity. Apart from simple treatments such as modified activity, rest and anti-inflammatory medication, more specialised treatments include :

Orthotics and Supportive Footwear

Proper footwear and custom orthotics help correct biomechanical issues, providing better support to reduce shin stress and alleviate pain. Orthotics are beneficial for shin splints and exertional compartment syndrome. 

Physiotherapy

Physiotherapists guide patients through exercises to correct their gait, improve flexibility, and strengthen the lower leg muscles. For ECS, physical therapy can help improve muscle flexibility and reduce the need for surgical intervention.

Low-Intensity Pulsed Ultrasound (LIPUS) Therapy

LIPUS therapy is a non-invasive treatment that uses low-intensity ultrasound waves to stimulate bone healing. In the case of shin pain caused by stress fractures, LIPUS has been shown to accelerate bone regeneration and healing by enhancing cell activity at the fracture site. LIPUS therapy is typically applied daily for about 20 minutes and has shown promising results for faster recovery from stress fractures and bone stress injuries.

Shockwave Therapy

Shockwave therapy uses acoustic waves to stimulate healing in chronic shin pain. It can treat MTSS or shin stress fractures by increasing blood flow, promoting healing, and reducing inflammation in the affected area.

Surgical Intervention

Surgery is a last resort for shin pain, but may be necessary for cases of exertional compartment syndrome. Fasciotomy, a procedure where the fascia around the muscle is cut to relieve pressure, can be performed if conservative treatments do not relieve symptoms.