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M17.0 – Primary Bilateral Gonarthrosis

M17.0 is the ICD-10 code for primary bilateral gonarthrosis (knee osteoarthritis). It is a degenerative joint disease causing cartilage loss and pain in both knees.

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Things worth knowing about "M17.0"

M17.0 is the ICD-10 code for primary bilateral gonarthrosis (knee osteoarthritis). It is a degenerative joint disease causing cartilage loss and pain in both knees.

What is M17.0?

M17.0 is a diagnostic code from the International Classification of Diseases (ICD-10) that refers to primary bilateral gonarthrosis – osteoarthritis affecting both knee joints without an identifiable underlying disease as the cause. Gonarthrosis is the most common form of joint osteoarthritis and one of the most prevalent musculoskeletal conditions in older adults.

Causes

In primary gonarthrosis (M17.0), no specific underlying disease is responsible. The condition develops due to multiple contributing factors:

Age: The ability of cartilage to regenerate decreases with advancing age.
Body weight: Excess weight significantly increases the mechanical load on the knee joints.
Genetic predisposition: A familial tendency is well recognized.
Sex: Women are more frequently affected, particularly after menopause.
Malalignment: Valgus (knock-knee) or varus (bow-leg) deformities can increase cartilage stress.
Physical overload: Prolonged heavy manual labor or intensive athletic activity over many years.

Symptoms

Symptoms of M17.0 typically develop gradually and worsen over time:

Start-up pain: Pain at the beginning of movement after a period of rest.
Activity-related pain: Pain during walking, climbing stairs, or prolonged standing.
Rest pain: In advanced stages, pain may occur at rest or during the night.
Morning stiffness: A feeling of stiffness after waking up, usually lasting less than 30 minutes.
Swelling: Joint effusion (fluid accumulation) in the knee may occur.
Crepitus: A grinding or crackling sensation in the joint during movement.
Reduced range of motion: Limitation of flexion and extension of the knee.

Diagnosis

The diagnosis of M17.0 is established through clinical assessment and imaging:

Medical history and physical examination: Assessment of pain characteristics, location, and duration, as well as evaluation of joint mobility.
X-ray: Standard imaging method to assess joint space narrowing, bony outgrowths (osteophytes), and bone structure.
MRI (Magnetic Resonance Imaging): Detailed visualization of cartilage, ligaments, and menisci, particularly in early stages.
Ultrasound: Detection of joint effusions and soft tissue changes.
Laboratory tests: To rule out inflammatory arthritis (e.g., rheumatoid arthritis, gout).

Treatment

Conservative Treatment

Management of gonarthrosis (M17.0) initially focuses on non-surgical approaches:

Physiotherapy: Strengthening of the muscles surrounding the knee, stretching, and balance training.
Weight reduction: Reducing body weight decreases mechanical load on the knee joints.
Pain management: Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or diclofenac, paracetamol, and topical agents.
Intra-articular injections: Corticosteroids for acute inflammatory flares, or hyaluronic acid injections to improve joint lubrication.
Orthopedic aids: Insoles, orthoses, or walking aids to relieve joint stress.
Heat and cold therapy: Depending on symptoms, to reduce pain and inflammation.

Surgical Treatment

If conservative treatment is insufficient or symptoms are severe, surgical options may be considered:

Arthroscopy: Joint inspection and removal of loose bodies or cartilage smoothing (now recommended only in specific indications).
Osteotomy: Correction of malalignment (e.g., bow legs) to redistribute weight-bearing forces across the joint.
Total knee arthroplasty (TKA): Partial or complete replacement of the knee joint with a prosthesis in advanced osteoarthritis.

Prognosis

Gonarthrosis is a chronic, progressive condition. A complete cure is not possible; however, targeted treatment can significantly reduce pain and preserve quality of life over the long term. Early measures such as weight loss, muscle strengthening, and exercise therapy can slow the progression of the disease.

References

World Health Organization (WHO): International Statistical Classification of Diseases and Related Health Problems, 10th Revision (ICD-10). Geneva: WHO.
Kolasinski SL et al.: 2019 American College of Rheumatology / Arthritis Foundation Guideline for the Management of Osteoarthritis of the Hand, Hip, and Knee. Arthritis Care & Research 2020; 72(2): 149–162.
Hochberg MC et al.: Osteoarthritis – Diagnosis and Medical/Surgical Management. 4th ed. Lippincott Williams & Wilkins, 2011.

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