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M84.1 – Non-Union Fracture (Pseudarthrosis)
M84.1 is the ICD-10 code for a non-union fracture (pseudarthrosis). It describes a fracture that fails to achieve complete bony healing over an extended period.
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M84.1 is the ICD-10 code for a non-union fracture (pseudarthrosis). It describes a fracture that fails to achieve complete bony healing over an extended period.
Definition
M84.1 is a diagnostic code from the International Classification of Diseases (ICD-10). It refers to a non-union fracture, medically known as pseudarthrosis (from Greek: pseudo = false, arthron = joint). This condition occurs when a broken bone fails to heal completely over an extended period – typically more than six months. Instead of proper bone bridging, fibrous or cartilaginous tissue may form between the fracture ends, sometimes creating a false joint.
Causes
Pseudarthrosis develops when the natural bone healing process is disrupted. Common causes include:
- Inadequate immobilisation of the fracture (e.g., insufficient stabilisation with a cast or implants)
- Impaired blood supply to the bone or surrounding tissue
- Infection at the fracture site (infected non-union)
- Soft tissue interposition (soft tissue trapped between fracture ends preventing bony union)
- Systemic conditions such as diabetes mellitus, osteoporosis or renal dysfunction
- Smoking (significantly reduces bone vascularisation and healing capacity)
- Nutritional deficiencies, particularly calcium, vitamin D or protein
- Medications such as corticosteroids, non-steroidal anti-inflammatory drugs (NSAIDs) or certain chemotherapy agents
Symptoms
Patients with a non-union fracture commonly report:
- Persistent pain at the former fracture site
- Swelling and possible soft tissue changes
- Instability of the affected bone or joint – a feeling that the bone gives way
- Reduced weight-bearing capacity and limited mobility
- Visible or palpable deformity of the bone
Diagnosis
Several imaging and clinical methods are used to diagnose a non-union (M84.1):
- X-ray: Standard method to assess healing progress and visualise the fracture gap
- Computed Tomography (CT): Detailed assessment of bony structures and healing status
- Magnetic Resonance Imaging (MRI): Evaluation of soft tissue changes, blood supply and bone marrow involvement
- Bone scintigraphy: Assessment of metabolic bone activity to distinguish between active and inactive non-union
- Laboratory tests: To rule out infection, metabolic disorders or nutritional deficiencies
Treatment
Treatment depends on the underlying cause, the type of non-union and the overall health of the patient.
Conservative Treatment
- Immobilisation with a cast, orthosis or external fixator
- Physical therapy: Ultrasound or extracorporeal shockwave therapy to stimulate bone regeneration
- Electrical stimulation: Electric fields can promote bone growth
- Management of underlying conditions: Optimising blood sugar control, correcting nutritional deficiencies (vitamin D, calcium)
Surgical Treatment
- Osteosynthesis: Surgical stabilisation of the fracture using plates, nails or screws
- Bone grafting (cancellous bone graft): Transplanting autologous bone tissue to promote healing
- Bone substitutes or growth factors: Biological agents to support bone regeneration
- Cortical decortication: Freshening of bone surfaces to reactivate the healing process
Prognosis
With targeted treatment, non-union fractures can in many cases be successfully resolved. The outlook depends strongly on the underlying cause, the type and location of the non-union, and the general health of the patient. Early diagnosis and consistent treatment significantly improve the prognosis.
References
- World Health Organization (WHO): International Statistical Classification of Diseases and Related Health Problems, 10th Revision (ICD-10), Code M84.1 – Non-union of fracture [pseudarthrosis].
- Giannoudis P.V., Einhorn T.A., Marsh D.: Fracture healing: The diamond concept. Injury. 2007;38 Suppl 4:S3-6. PubMed PMID: 18224731.
- Zura R. et al.: Epidemiology of Fracture Nonunion in 18 Human Bones. JAMA Surg. 2016;151(11):e162775. PubMed PMID: 27580262.
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