S83.115 Anterior dislocation of proximal end of tibia, left knee

Name of the Condition

Anterior dislocation of proximal end of tibia, left knee

Summary

This condition involves the complete anterior displacement of the proximal tibia (shinbone) relative to the femur (thighbone) at the left knee joint. Dislocation refers to a full separation of the bones, disrupting normal joint alignment and function. It can cause significant pain, instability, and functional impairment due to the loss of joint congruity.

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 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 fractures or soft tissue damage.

Treatment Options

Initial treatment focuses on reducing the dislocation (realigning the bones) under anesthesia, followed by immobilization with a brace or cast. Physical therapy is essential to restore strength and mobility. Severe or recurrent cases may require surgical intervention to repair damaged ligaments or stabilize the joint.

Prognosis and Follow-Up

Prognosis depends on the severity of the injury and adherence to treatment. Most patients recover function with proper rehabilitation, but some may experience long-term instability or arthritis. Follow-up appointments monitor healing and guide rehabilitation progress.

Complications

Potential complications include chronic knee instability, post-traumatic arthritis, nerve or vascular damage, and recurrent dislocations. Incomplete reduction or delayed treatment may worsen outcomes.

Lifestyle & Prevention

Strengthening knee muscles (quadriceps, hamstrings) and maintaining flexibility can reduce risk. Using proper techniques in sports and avoiding high-risk movements may help prevent injuries. Wearing protective gear during activities with fall risks is advisable.

When to Seek Professional Help

Seek immediate medical attention if the knee appears deformed, is unable to bear weight, or is associated with severe pain, swelling, or numbness. These signs may indicate a dislocation or other serious injury requiring urgent care.

Tips for Medical Coders

Use this code for confirmed anterior dislocation of the proximal tibia at the left knee. Document the mechanism of injury, physical exam findings, and imaging results to support the diagnosis. Ensure laterality (left knee) is clearly specified in the medical record.