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M17.1 – Primary Gonarthrosis One Knee | ICD-10
M17.1 is the ICD-10 code for primary gonarthrosis of one knee – a degenerative cartilage condition affecting a single knee joint with no underlying disease.
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M17.1 is the ICD-10 code for primary gonarthrosis of one knee – a degenerative cartilage condition affecting a single knee joint with no underlying disease.
What is M17.1?
M17.1 is a diagnostic code from the ICD-10 classification (International Classification of Diseases, 10th Revision) and stands for primary gonarthrosis of one knee. This refers to a degenerative joint disease of the knee (gonarthrosis) that affects only one knee and is not caused by another underlying condition.
Gonarthrosis is the most common form of knee osteoarthritis and one of the most prevalent orthopaedic conditions worldwide. In M17.1, only one knee joint is affected; when both knees are involved, the code M17.0 is used instead.
Causes
Primary gonarthrosis develops without a specific underlying disease. Several risk factors contribute to its onset:
- Age: The capacity of cartilage to self-regenerate declines with increasing age.
- Overweight and obesity: Excess body weight places disproportionate stress on the knee joint.
- Genetic predisposition: A familial tendency has been well documented.
- Malalignment: Bow legs (varus deformity) or knock knees (valgus deformity) cause uneven load distribution.
- Physical overuse: Prolonged intensive physical activity can damage articular cartilage over time.
- Female sex: Women are more frequently affected, especially after menopause.
Symptoms
The symptoms of M17.1 typically develop gradually and worsen over the years:
- Knee pain, particularly during activity (climbing stairs, prolonged walking)
- Start-up pain after periods of rest (e.g., in the morning upon rising)
- Stiffness in the affected knee joint
- Swelling and warmth around the joint
- Crepitus (grinding or clicking sounds during movement)
- Reduced range of motion of the knee
- In advanced stages: resting pain and night-time discomfort
Diagnosis
The diagnosis M17.1 is typically established through a combination of clinical assessment and imaging:
- Medical history and physical examination: Assessment of pain, mobility, and joint alignment
- X-ray: Identifies characteristic findings such as joint space narrowing, osteophytes (bone spurs), and subchondral sclerosis
- MRI (Magnetic Resonance Imaging): Detailed visualisation of cartilage, menisci, and ligaments
- Ultrasound: Assessment of joint effusion and soft tissue structures
- Laboratory tests: To exclude inflammatory arthritis conditions
Treatment
Conservative Management
In earlier stages, non-surgical measures are the primary approach:
- Physiotherapy: Muscle strengthening, maintaining joint mobility, and offloading the joint
- Pain management: Use of NSAIDs (e.g., ibuprofen, diclofenac) or paracetamol
- Weight reduction: Reducing body weight to relieve joint load
- Assistive devices: Orthotics, knee braces, or walking aids
- Intra-articular injections: Corticosteroids or hyaluronic acid for short-term pain relief
Surgical Treatment
In advanced gonarthrosis where conservative treatment has been exhausted, surgical options may be considered:
- Arthroscopy: Joint irrigation or cartilage smoothing (recommended only in selected cases)
- Osteotomy: Realignment of the leg axis to redistribute joint loading
- Total knee arthroplasty (TKA): Implantation of an artificial knee joint in cases of severe joint degeneration
Prognosis and Outlook
Gonarthrosis is a chronic and progressive condition. With appropriate treatment, disease progression can be slowed and quality of life significantly improved. A complete cure is not possible, as articular cartilage has very limited regenerative capacity. Early intervention through weight management, muscle strengthening, and joint protection is essential.
References
- World Health Organization (WHO) – International Classification of Diseases, 10th Revision (ICD-10), Chapter XIII: Diseases of the musculoskeletal system and connective tissue, Code M17.1
- National Institute for Health and Care Excellence (NICE) – Osteoarthritis: care and management. Clinical Guideline CG177 (2014, updated 2022)
- Felson D.T. – Osteoarthritis of the knee. New England Journal of Medicine, 354(8): 841–848 (2006)
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