M61.012 Myositis ossificans traumatica, left shoulder

Name of the Condition

• Myositis Ossificans Traumatica, Left Shoulder

Summary

Myositis ossificans traumatica of the left shoulder is a condition marked by abnormal bone formation within the left shoulder muscle tissue, typically following trauma. This process results in a hard, painful mass that can limit shoulder movement and cause discomfort.

Causes

The condition is primarily caused by direct trauma to the left shoulder muscle, such as a contusion or injury. It may also result from surgical procedures or repetitive stress to the left shoulder area.

Risk Factors

• History of left shoulder muscle trauma or injury
• Participation in contact sports or high-impact activities involving the left shoulder
• Surgical intervention involving left shoulder muscle tissue
• Delayed or inadequate treatment of initial left shoulder injury

Symptoms

• Pain and tenderness at the left shoulder injury site
• Swelling and inflammation in the left shoulder
• A palpable, firm mass within the left shoulder muscle
• Reduced range of motion or stiffness in the left shoulder
• Possible fever or warmth in the area

Diagnosis

Diagnosis is based on clinical evaluation and imaging studies, such as X-rays, CT scans, or MRI, which can visualize the characteristic calcified or ossified lesion in the left shoulder. Biopsies are rarely needed but may be considered to rule out other conditions.

Treatment Options

• Rest and immobilization to reduce further injury
• Nonsteroidal anti-inflammatory drugs (NSAIDs) to manage pain and inflammation
• Physical therapy to restore mobility and strength
• Surgical intervention in severe cases to remove the ossified mass

Prognosis and Follow-Up

Most cases resolve with conservative treatment, though recovery may take several months. Follow-up imaging may be used to monitor bone formation. Persistent symptoms or functional impairment may require ongoing therapy or surgical evaluation.

Complications

• Chronic pain or stiffness in the left shoulder
• Reduced range of motion leading to functional limitations
• Recurrence of ossification if the initial injury is not properly managed
• Nerve compression or vascular compromise in rare cases

Lifestyle & Prevention

• Avoid re-injury to the left shoulder during recovery
• Use proper protective gear during sports or high-risk activities
• Engage in gradual, guided physical therapy to restore strength
• Maintain regular follow-up with a healthcare provider to monitor healing

When to Seek Professional Help

Seek medical attention if you experience severe pain, sudden swelling, or loss of function in the left shoulder, or if symptoms worsen despite conservative care.

Tips for Medical Coders

Document the specific location (left shoulder) and confirm the traumatic etiology. Ensure clinical notes support the diagnosis, including details of trauma, imaging findings, and treatment. Code M61.012 is specific to the left shoulder; verify laterality and exclude other sites.