Can calcium deposits in your shoulder tendon cause severe pain that strikes suddenly at night? Calcific tendonitis occurs when calcium phosphate crystals accumulate within the rotator cuff tendons, most commonly the supraspinatus tendon. This condition affects approximately 3% of adults, with the highest prevalence among individuals aged 40 to 60 years. The calcium deposits can remain asymptomatic for years before triggering acute inflammatory responses that cause severe shoulder pain and restricted movement. The condition progresses through distinct phases—formation, resting, and resorption—each presenting different clinical challenges and treatment considerations.
What Is Calcific Tendonitis?
Calcific tendonitis is a condition characterised by the formation of calcium deposits within the shoulder tendons, particularly those of the rotator cuff. Unlike other forms of tendonitis caused by overuse or injury, this condition develops when calcium crystals accumulate in otherwise healthy tendon tissue.
The deposits typically form in the supraspinatus tendon, though they can occur in other rotator cuff tendons. These calcium deposits can range from a toothpaste-like consistency to complex, chalk-like formations.
Phases of Calcific Tendonitis
The condition progresses through three distinct phases:
Formative Phase: Calcium deposits begin to accumulate in the tendon tissue. This phase may last several months and is often asymptomatic.
Resting Phase: The deposits have formed but remain relatively stable. Patients may experience minimal symptoms during this period.
Resorptive Phase: The body attempts to reabsorb the calcium deposits, triggering an acute inflammatory response. This phase typically causes the most severe pain and functional limitations.
Symptoms
The symptoms of calcific tendonitis vary depending on the phase and size of the calcium deposits.
Acute Phase Symptoms:
- Severe shoulder pain that often begins suddenly
- Pain that worsens at night and disrupts sleep
- Significant restriction in shoulder movement
- Difficulty lifting the arm away from the body
- Intense pain with overhead reaching
Chronic Phase Symptoms:
- Persistent dull aching in the shoulder
- Gradual decrease in range of motion
- Weakness with specific shoulder movements
- Pain that increases with certain activities
Many patients report that pain is most intense during the resorptive phase, when the body’s immune system responds to the calcium deposits.
Causes and Risk Factors
The exact cause of calcific tendonitis remains unclear, though several factors may contribute to its development:
Reduced Oxygen Supply: Decreased blood flow to some regions of the tendon may trigger calcium deposition.
Age: Most common in individuals between 40 and 60 years old.
Gender: Women are slightly more likely to develop this condition than men.
Metabolic Factors: Thyroid disorders and diabetes may increase risk.
Genetics: Family history may play a role in susceptibility.
Unlike traumatic injuries or repetitive strain injuries, calcific tendonitis can develop without any identifiable shoulder trauma or overuse.
Diagnosis
Accurate diagnosis requires a combination of clinical evaluation and imaging studies.
Physical Examination: An orthopaedic specialist will assess shoulder range of motion, strength, and tenderness in specific areas. Certain movements that compress the rotator cuff may reproduce symptoms.
Imaging Studies:
X-rays: The primary diagnostic tool for visualising calcium deposits. The deposits appear as radio-opaque (white) areas on standard shoulder radiographs.
Ultrasound: Can identify the size, location, and consistency of calcium deposits. Particularly useful for guided treatments.
MRI: May be ordered to evaluate associated soft tissue damage or rule out other shoulder pathology.
The appearance and location of calcium deposits on imaging help determine the most appropriate treatment approach.
Treatment Options
Treatment depends on the phase of the condition, severity of symptoms, and size of calcium deposits.
Conservative Treatment
Rest and Activity Modification: Avoiding aggravating activities while maintaining a gentle range of motion.
Anti-inflammatory Medications: NSAIDs help reduce pain and inflammation during acute phases.
Physical Therapy: Specific exercises to maintain shoulder mobility and strength. Particularly important during the resting phase.
Corticosteroid Injections: Can provide significant pain relief during acute flares. The injection delivers anti-inflammatory medication directly to the affected area.
Advanced Treatment Options
Extracorporeal Shock Wave Therapy (ESWT): Uses high-energy sound waves to break up calcium deposits. Studies show effectiveness rates of 60-90% for appropriate candidates.
Ultrasound-Guided Needling and Lavage: A minimally invasive procedure where the calcium deposit is punctured with a needle and flushed out using saline solution. Performed under ultrasound guidance for precision.
Arthroscopic Surgery: Reserved for cases that don’t respond to conservative treatment. The surgeon removes calcium deposits and may perform additional procedures to address related shoulder damage.
Recovery and Prognosis
Recovery timelines vary significantly based on the treatment approach and individual factors.
Natural Resolution: In some cases, calcific tendonitis resolves spontaneously as the body reabsorbs the calcium. This process may take months to years.
Post-Treatment Recovery:
- Conservative treatment: Improvement often occurs within 6-12 weeks
- ESWT: Gradual improvement over 3-6 months
- Surgical removal: Return to normal activities typically within 3-6 months
Physical therapy plays a crucial role in recovery, helping restore strength and range of motion while preventing recurrence.
Prevention
While calcific tendonitis cannot be entirely prevented, specific measures may reduce risk:
- Maintain regular shoulder mobility through appropriate exercises
- Address metabolic conditions such as diabetes and thyroid disorders
- Maintain a healthy body weight
- Avoid prolonged immobilisation of the shoulder
Conclusion
Calcific tendonitis progresses through distinct phases that determine symptom severity and treatment approach. Conservative management successfully resolves most cases, while advanced interventions like ultrasound-guided lavage or arthroscopic removal address persistent deposits. Early diagnosis via imaging enables targeted treatment before the condition significantly affects shoulder function.
When to See an Orthopaedic Specialist
If you are experiencing severe shoulder pain that worsens at night, sudden loss of shoulder range of motion, or persistent pain despite rest and over-the-counter medications, consult an orthopaedic specialist. Early evaluation can confirm the diagnosis through imaging and establish an appropriate treatment plan based on the phase and severity of your condition.
