M17.1 Unilateral primary osteoarthritis of knee

Name of the Condition

• Unilateral primary osteoarthritis of knee

Summary

Unilateral primary osteoarthritis of the knee is a degenerative joint condition affecting only one knee, characterized by the breakdown of cartilage and underlying bone. This leads to pain, stiffness, and reduced mobility in the affected joint.

Causes

Unilateral primary osteoarthritis of the knee results from gradual wear-and-tear of joint cartilage over time. It may also develop secondary to previous knee injuries, repetitive stress, or mechanical abnormalities in joint alignment.

Risk Factors

• Age: More common in individuals aged 50 and older
• Obesity: Increased weight places additional stress on knee joints
• Genetic predisposition: Family history of osteoarthritis
• Gender: Higher prevalence in females
• Occupations or sports involving heavy use of knees

Symptoms

• Pain and tenderness in the affected knee
• Stiffness, especially after resting or first thing in the morning
• Swelling and inflammation around the knee joint
• Reduced range of motion or difficulty walking
• Crepitus (grating sensation) during knee movement

Diagnosis

Diagnosis involves a physical examination to assess joint tenderness, swelling, and range of motion. Imaging tests such as X-rays are used to evaluate joint space narrowing and bony changes. MRI may be considered for detailed assessment if needed.

Treatment Options

• Medications: NSAIDs for pain and inflammation
• Physical therapy: Exercises to improve strength and mobility
• Weight management: Reducing stress on the knee joint
• Assistive devices: Braces or canes to support mobility
• Surgery: Joint replacement in severe cases

Prognosis and Follow-Up

Prognosis varies based on severity and treatment adherence. Regular follow-up with a healthcare provider is recommended to monitor symptoms and adjust treatment plans as needed.

Complications

• Chronic pain and disability
• Joint deformity
• Reduced quality of life
• Increased risk of falls due to mobility issues

Lifestyle & Prevention

• Maintain a healthy weight to reduce knee stress
• Engage in low-impact exercises to strengthen surrounding muscles
• Avoid repetitive high-impact activities
• Use proper footwear and ergonomic support

When to Seek Professional Help

Seek medical attention if experiencing persistent knee pain, swelling, or difficulty walking. Early intervention may help manage symptoms and prevent progression.

Tips for Medical Coders

Document the affected knee (right or left) and specify "unilateral" to ensure accurate coding. Include details on symptom onset, severity, and any contributing factors to support clinical documentation.