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M84.0 – Malunion of Fracture ICD-10
M84.0 is the ICD-10 code for malunion of fracture. It refers to a bone fracture that has healed in an incorrect position or alignment after treatment.
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M84.0 is the ICD-10 code for malunion of fracture. It refers to a bone fracture that has healed in an incorrect position or alignment after treatment.
What is ICD-10 Code M84.0?
The ICD-10 code M84.0 stands for malunion of fracture. This term describes a bone fracture that has healed, but in an incorrect position or alignment. As a result, the bone may appear deformed, and the patient may experience pain, reduced mobility, or other functional limitations.
Causes
A malunion can occur due to a variety of reasons, including:
- Inadequate immobilization of the bone during the healing process
- Improper reduction of bone fragments during initial treatment
- Premature weight-bearing or use of the injured limb
- Underlying bone disorders such as osteoporosis
- Poor blood supply to the fracture site
- Infection interfering with the healing process
- Metabolic conditions such as diabetes mellitus or vitamin D deficiency
Symptoms
Symptoms of a malunion depend on the affected bone and the degree of malalignment. Common signs include:
- Visible deformity or angulation of the affected limb or bone
- Pain during activity or movement
- Reduced range of motion in the adjacent joint
- Leg length discrepancy in fractures of the lower extremities
- Gait disturbances or an altered walking pattern
- Increased stress on neighboring joints, potentially leading to osteoarthritis over time
Diagnosis
Diagnosis of a malunion is typically established through:
- X-ray imaging: The primary method for assessing bone alignment and position
- Computed tomography (CT): Used for complex fractures or surgical planning
- Magnetic resonance imaging (MRI): To evaluate soft tissue damage and vascular compromise
- Clinical examination: Assessment of deformity, range of motion, and functional limitations
Treatment
Treatment of M84.0 depends on the severity of the malalignment and its impact on function and quality of life.
Conservative Treatment
In cases of mild malalignment with minimal functional impairment, conservative management may be sufficient and can include:
- Physiotherapy and targeted exercises to improve joint mobility
- Pain management with analgesics or anti-inflammatory medications
- Orthopedic aids such as insoles or orthoses
Surgical Treatment
For significant deformities or functional limitations, surgical correction (corrective osteotomy) is often required. This procedure involves surgically cutting the malunited bone, realigning it into the correct position, and stabilizing it with plates, screws, or an intramedullary nail. Goals of surgery include:
- Restoration of correct bone axis and alignment
- Improvement of joint function and mobility
- Pain relief
- Prevention of long-term complications such as osteoarthritis
Prognosis
The prognosis for M84.0 depends on the bone involved, the extent of the deformity, and the age and general health of the patient. Following a successful corrective osteotomy, good functional outcomes are achievable in many cases. Consistent post-operative rehabilitation and physiotherapy are essential for recovery.
References
- World Health Organization (WHO): International Statistical Classification of Diseases and Related Health Problems, 10th Revision (ICD-10), Code M84.0 – Malunion of fracture.
- Einhorn TA, Gerstenfeld LC: Fracture healing: mechanisms and interventions. Nature Reviews Rheumatology, 2015; 11(1): 45–54.
- Rockwood CA, Green DP (eds.): Rockwood and Green's Fractures in Adults. 9th edition, Wolters Kluwer, Philadelphia, 2020.
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