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S93.4 – Sprain and Strain of the Ankle
S93.4 is an ICD-10 code for sprain and strain of the ankle joint. It describes ligament injuries at the ankle without a bone fracture.
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S93.4 is an ICD-10 code for sprain and strain of the ankle joint. It describes ligament injuries at the ankle without a bone fracture.
What Does ICD-10 Code S93.4 Mean?
The ICD-10 code S93.4 stands for sprain and strain of the ankle joint. The ankle connects the lower leg to the foot and is stabilized by a complex system of ligaments. In a sprain, these ligaments are overstretched or partially torn without any bone being broken. This is one of the most common injuries in everyday life and in sports.
Causes
A sprained ankle typically occurs due to a sudden, uncontrolled movement of the foot that forces the joint beyond its normal range of motion. Common causes include:
- Rolling or twisting the foot while walking, running, or jumping
- Sports activities such as football, basketball, or volleyball
- Uneven ground or inappropriate footwear
- Falling on stairs or stumbling
- Muscle weakness or fatigue
Symptoms
The symptoms following an ankle sprain can vary greatly depending on the severity of the ligament injury. Typical symptoms include:
- Pain around the ankle, especially under load
- Swelling and edema formation around the joint
- Bruising (hematoma) in the ankle region
- Restricted range of motion in the ankle joint
- A feeling of instability when stepping or standing
Diagnosis
The diagnosis of an ankle sprain (S93.4) is usually made clinically through a medical examination. The physician assesses:
- The exact location of pain through targeted palpation
- The stability of the ligaments via specific stress tests
- The degree of swelling and any bruising present
To rule out a bone fracture, an X-ray is often performed. If a more serious ligament injury is suspected, a magnetic resonance imaging (MRI) scan may additionally be ordered.
Grades of Severity
Ankle ligament injuries are classified into three grades of severity:
- Grade I: Stretching of the ligaments without tearing – mild swelling, minimal instability
- Grade II: Partial tear of one or more ligaments – noticeable swelling, moderate instability
- Grade III: Complete rupture of a ligament – severe swelling, significant instability
Treatment
Treatment depends on the severity of the injury. In the acute phase, the RICE protocol is the standard of care:
- Rest – immediate relief of the injured joint
- Ice – cooling to reduce pain and swelling (not directly on the skin)
- Compression – application of a compression bandage
- Elevation – raise the injured leg to promote fluid drainage
Further treatment options include:
- Physiotherapy to restore strength, mobility, and coordination
- Braces or taping to stabilize the joint
- Pain medication such as ibuprofen or paracetamol for significant pain
- In cases of complete ligament rupture (Grade III), surgical intervention may occasionally be required
Prognosis and Recovery Time
Most ankle sprains heal well with consistent treatment. Recovery time varies by severity:
- Grade I: a few days to 1–2 weeks
- Grade II: 2–6 weeks
- Grade III: 6–12 weeks or longer
Without adequate treatment and rehabilitation, there is a risk of chronic joint instability, which can lead to recurring sprains.
References
- World Health Organization (WHO): International Statistical Classification of Diseases and Related Health Problems, 10th Revision (ICD-10), Code S93.4 – Sprain and strain of ankle.
- Kannus P. - Immobilization or mobilization after acute ankle distortion? - Archives of Orthopaedic and Trauma Surgery, Springer, 1991.
- Kerkhoffs GM et al. - Diagnosis, treatment and prevention of ankle sprains: an evidence-based clinical guideline - British Journal of Sports Medicine, 2012; 46(12):854–860.
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