M11.05 Hydroxyapatite deposition disease, hip

Name of the Condition

• Hydroxyapatite deposition disease, hip

Summary

Hydroxyapatite deposition disease (HADD) of the hip is a condition characterized by the deposition of calcium phosphate crystals (hydroxyapatite) in soft tissues around the hip joint, leading to inflammation and pain. It typically affects periarticular structures such as tendons, ligaments, or bursae and may present with acute symptoms. The condition can cause significant discomfort and functional impairment, though it often resolves spontaneously over time.

Causes

HADD is caused by the deposition of hydroxyapatite crystals in soft tissues around the hip. The exact trigger for crystal formation is not fully understood, but it may occur spontaneously or in association with trauma, overuse, or metabolic conditions. The crystals can provoke an inflammatory response, contributing to symptoms.

Risk Factors

• Repetitive hip motion or overuse.
• Trauma to the hip joint.
• Metabolic disorders (e.g., diabetes, hyperparathyroidism).
• Advanced age.
• Chronic kidney disease.

Symptoms

• Sudden, severe pain in the hip.
• Swelling and tenderness around the hip.
• Limited range of motion.
• Warmth or redness over the hip.
• Pain that worsens with movement or weight-bearing.

Diagnosis

Diagnosis is based on clinical presentation, including sudden onset of pain and tenderness in the hip. Imaging (e.g., X-rays, ultrasound) may show calcific deposits. Joint aspiration is rarely performed but can confirm crystal presence if needed. Clinical evaluation and exclusion of other conditions are key.

Treatment Options

Treatment focuses on managing pain and inflammation. Options may include rest, ice, nonsteroidal anti-inflammatory drugs (NSAIDs), and physical therapy to improve mobility. In severe cases, corticosteroid injections or surgical intervention may be considered. Management is typically conservative, with most cases resolving without long-term intervention.

Prognosis and Follow-Up

Prognosis is generally favorable, as HADD often resolves spontaneously within weeks to months. Follow-up may involve monitoring symptoms and functional improvement. Recurrence is possible, especially with repeated trauma or underlying metabolic conditions. Most patients recover fully with appropriate management.

Complications

Complications are rare but may include chronic pain, persistent limited mobility, or recurrence. In some cases, calcific deposits may persist, leading to ongoing discomfort. Early diagnosis and treatment can minimize these risks.

Lifestyle & Prevention

• Avoid repetitive or excessive hip movements.
• Use proper techniques during physical activity to reduce strain.
• Maintain a healthy weight to minimize joint stress.
• Address underlying metabolic conditions to reduce risk.
• Warm up before exercise and cool down afterward.

When to Seek Professional Help

Seek medical attention if you experience sudden, severe hip pain, swelling, or inability to bear weight. Persistent symptoms or worsening pain despite rest and over-the-counter treatments also warrant evaluation.

Tips for Medical Coders

Document the specific site (hip) and clinical details supporting the diagnosis. Include notes on imaging findings (e.g., calcific deposits) or clinical presentation (e.g., acute pain, tenderness) to justify code assignment. Ensure documentation aligns with the ICD-10-CM guidelines for M11.05.