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M16.0 – Primary Bilateral Coxarthrosis
M16.0 is the ICD-10 code for primary bilateral coxarthrosis (hip osteoarthritis). The cartilage of both hip joints gradually breaks down, causing pain and limited mobility.
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M16.0 is the ICD-10 code for primary bilateral coxarthrosis (hip osteoarthritis). The cartilage of both hip joints gradually breaks down, causing pain and limited mobility.
What is M16.0?
The ICD-10 code M16.0 refers to primary coxarthrosis, bilateral – meaning osteoarthritis affecting both hip joints without an identifiable underlying disease as the primary cause. Coxarthrosis is a degenerative joint condition in which the protective cartilage within the hip joint progressively deteriorates. In advanced stages, the underlying bone can also become affected.
Causes
In primary coxarthrosis (M16.0), no single clear cause is identified. Multiple contributing factors are typically involved:
- Age: The ability of cartilage to regenerate declines with age.
- Genetic predisposition: A family history of osteoarthritis increases the risk.
- Body weight: Excess weight places increased mechanical stress on the hip joints.
- Sex: Women are more frequently affected, particularly after menopause.
- Physical inactivity or chronic overloading: Both extremes can accelerate cartilage damage.
Symptoms
Symptoms typically develop gradually and worsen over time:
- Hip pain that may radiate to the groin, thigh, or knee
- Start-up pain: Pain at the beginning of movement that eases after a short time
- Load-related pain: Pain during walking, climbing stairs, or prolonged activity
- Rest pain in later stages, including at night
- Stiffness and reduced range of motion in the hip joint
- Audible clicking or grinding in the joint
- Altered gait pattern (limping)
Diagnosis
The diagnosis of bilateral primary coxarthrosis (M16.0) is established through:
- Medical history and physical examination: Assessment of range of motion, pain localization, and gait
- X-ray imaging: Typical findings include joint space narrowing, osteophyte formation (bone spurs), and subchondral sclerosis
- MRI or CT scan: Used in cases of diagnostic uncertainty or for surgical planning
- Laboratory tests: To rule out inflammatory causes such as rheumatoid arthritis
Treatment
Conservative Treatment
In early to moderate stages, non-surgical approaches are the first-line option:
- Physiotherapy and exercise therapy: Strengthening of the muscles surrounding the joint and improving mobility
- Pain medication: Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or diclofenac
- Weight management: Reducing body weight to relieve joint load
- Heat or cold therapy for symptom relief
- Assistive devices: Walking aids or orthotic insoles
- Intra-articular injections: Corticosteroids or hyaluronic acid injected directly into the joint
Surgical Treatment
When osteoarthritis is advanced and conservative measures are insufficient, surgery is recommended:
- Total hip arthroplasty (THA): Full replacement of the damaged hip joint with a prosthetic implant – one of the most common and successful orthopedic procedures worldwide
- In bilateral coxarthrosis, surgery on both hips may be required, typically performed as two separate procedures
Prognosis
Primary bilateral coxarthrosis is a chronic, progressive condition that cannot be cured. However, with appropriate treatment, disease progression can be slowed and quality of life significantly improved. Total hip arthroplasty provides substantial pain relief and functional improvement in the majority of patients.
References
- World Health Organization (WHO): ICD-10 International Classification of Diseases, 10th Revision, Code M16.0. Geneva: WHO.
- National Institute for Health and Care Excellence (NICE): Osteoarthritis: care and management. Clinical guideline CG177, 2014 (updated 2022). Available at: www.nice.org.uk.
- Felson D.T.: Osteoarthritis of the hip. New England Journal of Medicine, 2006; 354(8): 841–848.
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