S83.122D Posterior subluxation of proximal end of tibia, left knee, subsequent encounter

Name of the Condition

Posterior subluxation of proximal end of tibia, left knee, subsequent encounter

Summary

This condition involves the partial posterior displacement of the proximal tibia relative to the femur at the left knee joint. Subluxation refers to a partial displacement, while dislocation is a complete separation. Both can cause pain, instability, and functional impairment due to disrupted joint alignment. The "subsequent encounter" indicates this is a follow-up visit for the same injury.

Causes

Traumatic injuries, such as falls, sports accidents, or high-impact events, are common causes. Sudden forceful movements, like twisting or hyperextension, may also lead to subluxation or dislocation. Underlying ligament or structural weaknesses can contribute to these injuries.

Risk Factors

• Participation in high-impact sports (e.g., football, basketball) or activities with sudden directional changes.
• Previous knee injuries or ligament damage.
• Poor muscle strength or flexibility around the knee.
• Conditions that affect joint stability, such as hypermobility or connective tissue disorders.

Symptoms

• Knee pain, swelling, and bruising.
• Visible deformity or abnormal alignment of the knee.
• Instability or the knee "giving way."
• Limited range of motion or inability to bear weight.

Diagnosis

Diagnosis involves a physical examination to assess joint alignment and stability. Imaging tests, such as X-rays or MRIs, are used to confirm the extent of displacement and rule out associated injuries. Clinical history, including the mechanism of injury, is also considered.

Treatment Options

Treatment may include immobilization with a brace or cast, physical therapy to restore strength and mobility, and pain management. Severe cases may require surgical intervention to stabilize the joint. Rehabilitation focuses on gradual return to function.

Prognosis and Follow-Up

Prognosis depends on the severity of the injury and adherence to treatment. Most patients recover with appropriate care, though some may experience residual instability. Follow-up visits monitor healing and functional recovery, adjusting treatment as needed.

Complications

Potential complications include chronic instability, recurrent subluxation, arthritis, or nerve damage. Incomplete healing or improper rehabilitation may increase these risks.

Lifestyle & Prevention

Avoid high-impact activities until cleared by a provider. Strengthening exercises for the knee and surrounding muscles can improve stability. Proper warm-up and technique in sports reduce injury risk. Use protective gear during activities with fall potential.

When to Seek Professional Help

Seek care if pain worsens, swelling increases, or the knee feels unstable. Immediate attention is needed for sudden severe pain, inability to bear weight, or visible deformity, as these may indicate a more serious injury.

Tips for Medical Coders

Use this code for a subsequent encounter for posterior subluxation of the proximal tibia at the left knee. Document the encounter type (subsequent) and laterality (left) clearly. Ensure clinical notes support the diagnosis and encounter context to justify code assignment.