Introduction
Calcific tendinitis is a painful condition characterized by the formation of calcium deposits within a tendon, most commonly affecting the rotator cuff tendons of the shoulder. These calcium deposits can cause significant pain and functional limitation, particularly during the resorptive phase when the body attempts to remove them. This comprehensive guide will help you understand this condition and navigate treatment options.
Understanding Calcific Tendinitis
What is Calcific Tendinitis?
Calcific tendinitis occurs when calcium deposits (hydroxyapatite crystals) form within the substance of a tendon. This is distinct from calcific bursitis (calcium in the bursa) or bone spurs (calcium at tendon insertions).
Key Characteristics:
– Calcium deposits form within healthy tendon tissue
– Not related to injury in most cases
– Represents a cellular-mediated process
– Can spontaneously resolve (body reabsorbs calcium)
– Most common in rotator cuff (85-95% of cases)
Anatomy
Most Common Sites:
Shoulder (85-95% of cases):
– Supraspinatus tendon (most common, 50-60%)
– Infraspinatus tendon (25-30%)
– Subscapularis tendon (10-15%)
– Multiple tendons involved in 30% of cases
– Bilateral shoulders in 10-20% of cases
Other Sites (Less Common):
– Hip (gluteus medius, gluteus minimus tendons)
– Wrist (flexor carpi ulnaris)
– Elbow (triceps, common extensor origin)
– Knee (patellar tendon, quadriceps tendon)
– Foot and ankle (Achilles tendon)
– Neck (longus colli tendon – causes retropharyngeal calcific tendinitis)
Who Gets Calcific Tendinitis?
Demographics:
– Age: 30-60 years (peak 40-50)
– Women slightly more common than men (3:2 ratio)
– More common in diabetics
– No clear association with occupation or dominant hand
– Not typically related to overuse or trauma
Stages and Pathophysiology
Uhthoff’s Classification (3 Stages)
Stage 1: Pre-Calcific Stage
– Tendon tissue undergoes fibrocartilaginous transformation
– Creates environment conducive to calcium deposition
– Usually asymptomatic
– Duration: Variable
Stage 2: Calcific Stage (Divided into 3 Phases)
Phase A: Formative Phase
– Calcium crystals form and accumulate
– Deposits appear chalk-like, firm
– Usually minimal symptoms
– Can last months to years
Phase B: Resting Phase
– Deposit present but stable
– May be entirely asymptomatic
– Can persist indefinitely
– Appears dense on X-ray
Phase C: Resorptive Phase(MOST PAINFUL)
– Body attempts to remove calcium deposit
– Calcium becomes soft, toothpaste-like consistency
– Inflammatory response activated
– Vascular granulation tissue invades deposit
– Deposit may rupture into bursa
– This phase causes the acute, severe pain
– Duration: Days to weeks
Stage 3: Post-Calcific Stage
– Healing and remodeling
– Tendon repairs itself
– Normal tendon architecture restored
– Usually pain-free
Size Classification
Small: <5 mm
Medium: 5-15 mm
Large: >15 mm
Larger deposits tend to be more symptomatic and less likely to spontaneously resolve.
Signs and Symptoms
Clinical Presentation Varies by Stage
Formative/Resting Phase (Often Asymptomatic)
When Symptomatic:
– Mild, chronic shoulder pain
– Pain with overhead activities
– Night pain (lying on affected shoulder)
– Reduced range of motion
– Symptoms similar to rotator cuff tendinopathy
Resorptive Phase (ACUTE, SEVERE)
Characteristic Symptoms:
– Sudden onset of severe pain
– Pain at rest and with any movement
– Inability to move shoulder (pseudoparalysis)
– Extreme tenderness to touch
– Significant night pain (unable to sleep on shoulder)
– Cannot tolerate even gentle pressure
– All movements painful (flexion, abduction, rotation)
Comparison:
– Pain often described as “worst pain imaginable”
– Similar to acute gout or kidney stone
– May go to emergency room due to severity
– Often initially misdiagnosed as rotator cuff tear or frozen shoulder
Physical Examination Findings
Inspection:
– Normal appearance (no visible swelling usually)
– Patient guards shoulder protectively
Palpation:
– Exquisite tenderness over involved tendon
– May feel fullness if bursa distended
Range of Motion:
– Significantly limited (especially resorptive phase)
– Both active and passive motion restricted
– Pain at extremes of motion
– Abduction and external rotation typically most limited
Strength Testing:
– May appear weak due to pain inhibition
– True strength usually preserved (unlike rotator cuff tear)
– Give way weakness from pain
Special Tests:
– Positive painful arc (60-120 degrees abduction)
– Positive impingement signs (Neer, Hawkins-Kennedy)
– Painful resisted testing of involved tendon
Diagnosis
Clinical Diagnosis
History:
– Age 30-60
– Sudden onset severe pain (resorptive phase) OR
– Chronic shoulder pain (formative phase)
– No specific injury
– Night pain prominent
– Difficulty with overhead activities
Physical Exam:
– Findings as described above
– Rule out other shoulder pathology
Imaging Studies
X-rays (Standard First Test)
Views:
– AP (anteroposterior)
– Scapular Y
– Axillary view (may best show deposit)
Appearance:
– Formative Phase: Dense, homogeneous, well-defined opacity
– Resorptive Phase: Fluffy, cloud-like, less well-defined
– Size, location, and appearance noted
Limitations:
– May miss small deposits
– 2D representation of 3D structure
– Cannot assess tendon integrity
Ultrasound
Advantages:
– Dynamic assessment
– Can guide injection
– Assess tendon integrity
– Identify bursal involvement
– No radiation
– Cost-effective
Appearance:
– Hyperechoic (bright white) focus within tendon
– May show acoustic shadowing
– Can assess deposit consistency
MRI
Not Usually First-Line, but Shows:
– Calcium deposits (may appear dark on all sequences)
– Associated tendon pathology
– Bursal fluid
– Bone edema
– Other shoulder pathology
When to Order:
– Atypical presentation
– Concern for rotator cuff tear
– Pre-operative planning
– Failed conservative treatment
CT Scan
Rarely Needed:
– Excellent visualization of calcium
– 3D reconstruction possible
– Useful for surgical planning
– Higher radiation than X-ray
Treatment Options
Natural History
Important to Understand:
– Many cases resolve spontaneously (50-75% eventually)
– Resorptive phase pain resolves in days to weeks usually
– Complete resolution can take months to years
– Cannot predict who will resolve spontaneously
Conservative First:
– Most patients managed non-operatively initially
– Surgery reserved for persistent, refractory cases
Conservative Treatment
Acute/Resorptive Phase Management
Immediate Care:
Rest and Activity Modification:
– Avoid aggravating activities
– Sling for comfort (not prolonged immobilization)
– No overhead activities
– Gentle daily activities as tolerated
Ice:
– 15-20 minutes, 4-6 times daily
– Particularly after any activity
– Reduces inflammation and pain
Medications:
– NSAIDs (ibuprofen, naproxen) around-the-clock
– Acetaminophen for additional pain relief
– Short course oral corticosteroids may be considered
– Prescription pain medications if severe
Physical Therapy (Initially Limited):
– Pendulum exercises for gentle motion
– Avoid aggressive stretching during acute phase
– Pain management modalities (ice, electrical stimulation)
Subacute Phase (After Acute Pain Subsides)
Physical Therapy (Key Component):
Phase 1 (Weeks 1-2): Restore Motion
– Gentle passive range of motion
– Pendulum exercises
– Supine forward elevation
– External rotation with stick
– Pain-free range only
Phase 2 (Weeks 3-6): Progressive Motion and Early Strengthening
– Active-assisted range of motion
– Active range of motion
– Scapular stabilization exercises
– Rotator cuff strengthening (gentle)
– Stretching program
Phase 3 (Weeks 7-12): Advanced Strengthening
– Progressive resistance exercises
– Functional activities
– Sport-specific training
– Return to normal activities
Duration: 6-12 weeks typically
Injections
Corticosteroid Injection:
– Very effective for acute/resorptive phase pain
– Reduces inflammation
– Relief in 70-90% of patients
– May provide temporary relief (weeks to months)
– Can repeat 2-3 times per year maximum
– Ultrasound guidance improves accuracy
Technique:
– Subacromial space injection OR
– Into/around the deposit (less common)
Timing:
– Most beneficial during resorptive phase
– Can help during formative phase with symptoms
– Often dramatic pain relief within days
Advanced/Interventional Treatments
Ultrasound-Guided Barbotage (Needling and Lavage)
Procedure:
– Under ultrasound guidance
– Needle inserted into calcium deposit
– Deposit punctured multiple times
– Calcium aspirated and/or irrigated with saline
– Often combined with corticosteroid injection
Effectiveness:
– Success rate 70-90%
– Best for soft, toothpaste-like deposits (resorptive phase)
– Less effective for hard, dense deposits
– Pain relief often within days to weeks
Advantages:
– Minimally invasive
– Can be done in office
– No incision
– Quick recovery
Limitations:
– Requires soft deposit consistency
– May need repeat procedure
– Deposit may not be fully removable
Extracorporeal Shock Wave Therapy (ESWT)
Mechanism:
– High-energy shock waves delivered to deposit
– Believed to fragment calcium
– Stimulates healing response
– Increases local blood flow
Protocol:
– Usually 3-6 sessions
– 1 week apart typically
– Outpatient procedure
Effectiveness:
– Success rates vary: 50-75%
– Better for small-medium deposits
– May take weeks to months for improvement
– Some studies question effectiveness
Advantages:
– Non-invasive
– No anesthesia needed
– Minimal side effects
Disadvantages:
– Multiple sessions required
– Can be painful during treatment
– Not always covered by insurance
– Variable results
Surgical Treatment
Indications:
– Failed conservative treatment (6-12 months)
– Large deposits (>15mm) with persistent symptoms
– Recurrent acute episodes
– Significant functional limitation
– Patient preference after informed discussion
Surgical Options:
1. Arthroscopic Removal (Most Common)
Procedure:
– Minimally invasive
– 2-3 small incisions
– Calcium deposit identified and removed
– Bursa may be debrided
– Tendon defect repaired if needed
– Subacromial decompression often performed
Advantages:
– Less invasive than open surgery
– Better cosmesis
– Faster recovery
– Lower infection risk
– Better visualization
Recovery:
– Sling 1-2 weeks
– Gentle motion begins immediately
– Return to activities 3-6 months
2. Open Surgical Removal (Rare Now)
When Used:
– Very large deposits
– Arthroscopy failed
– Severe tendon damage requiring repair
– Surgeon preference/experience
Recovery:
– Similar to arthroscopic but slightly longer
Success Rates:
– 85-95% pain relief
– 90-95% patient satisfaction
– Low recurrence rate (< 5%)
– Complications rare
Location-Specific Considerations
Hip Calcific Tendinitis
Common Tendons:
– Gluteus medius
– Gluteus minimus
Symptoms:
– Severe lateral hip pain
– Inability to lie on affected side
– Difficulty walking
– May mimic hip fracture or septic joint
Treatment:
– Similar principles as shoulder
– NSAIDs, rest, PT
– Injection therapy effective
– Surgery rarely needed
Longus Colli Calcific Tendinitis (Neck)
Special Condition:
– Calcium in longus colli tendon (front of cervical spine)
– Causes retropharyngeal inflammation
Symptoms:
– Severe neck pain
– Difficulty swallowing (dysphagia)
– Neck stiffness
– Sometimes fever
– Can be mistaken for retropharyngeal abscess
Diagnosis:
– CT scan diagnostic
– Shows calcium deposit and retropharyngeal edema
Treatment:
– NSAIDs very effective
– Usually self-limited (1-2 weeks)
– Surgery NOT needed
Recovery Timeline
Acute/Resorptive Phase
Untreated:
– Severe pain: 1-2 weeks typically
– Gradual improvement: 2-6 weeks
– May persist longer
With Treatment:
– Corticosteroid injection: Relief within days
– Barbotage: Relief within days to weeks
– NSAIDs: Gradual improvement
Formative/Resting Phase
With Conservative Treatment:
– Improvement: 6-12 weeks
– Complete resolution: Variable (months to years)
Post-Surgical
Return to Activities:
– Light activities: 4-6 weeks
– Full activities: 3-4 months
– Heavy labor/sports: 4-6 months
Prognosis
Spontaneous Resolution
– Occurs in 50-75% of cases eventually
– More likely with:
* Smaller deposits
* Resorptive phase (ironically, despite pain)
* Younger patients
– May take months to years
– Cannot reliably predict
With Treatment
Conservative Treatment:
– Successful in 70-90%
– Combination of PT, NSAIDs, injections
– May require patience (months)
Surgical Treatment:
– Success rate 85-95%
– Low complication rate
– Recurrence uncommon (<5%)
– High patient satisfaction
Long-Term Outlook
Most Patients:
– Complete resolution of symptoms
– Return to normal activities
– No long-term limitations
– Calcium rarely reforms at same site
Risk of Recurrence:
– Low (<10%)
– May occur in opposite shoulder
– No reliable prevention
Prevention
No Known Prevention:
– Not related to overuse
– Not preventable with activity modification
– Unclear etiology makes prevention difficult
General Shoulder Health:
– Maintain strength and flexibility
– Proper posture and mechanics
– Avoid prolonged overhead positioning
– May help overall shoulder health but not specifically prevent calcific tendinitis
When to See a Doctor
Initial Evaluation:
– Sudden onset severe shoulder pain
– Pain not improving after 1-2 weeks
– Significant night pain
– Limited range of motion
– Interference with daily activities
Urgent Evaluation:
– Inability to move shoulder
– Severe pain unresponsive to medications
– Fever (rule out infection)
– Numbness or tingling in arm
Follow-Up Needed:
– Symptoms not improving after 4-6 weeks of treatment
– Recurrent episodes
– Considering advanced treatment options
Myths and Misconceptions
Myth: “Calcium deposits are from too much calcium in diet”
Fact: Dietary calcium is not related to tendon calcifications
Myth: “Physical therapy makes it worse”
Fact:** Appropriate PT is beneficial; aggressive stretching during acute phase should be avoided
Myth: “Surgery is always needed”
Fact: Most cases resolve with conservative treatment
Myth: “It’s the same as bone spurs”
Fact: Different entities; calcific tendinitis is calcium within tendon, not at bone attachment
Myth: “Once you have it, it keeps coming back”
Fact: Recurrence at same site is uncommon
Key Takeaways
– Calcific tendinitis is calcium deposit formation within a tendon, most commonly rotator cuff
– The resorptive phase causes severe acute pain but ironically indicates the body is removing the calcium
– Many cases resolve spontaneously over time (50-75%)
– Conservative treatment (NSAIDs, PT, injections) successful in 70-90%
– Corticosteroid injection can provide dramatic relief, especially during resorptive phase
– Barbotage and ESWT are minimally invasive options for persistent cases
– Surgery is highly effective (85-95% success) when conservative treatment fails
– Prognosis is excellent with appropriate treatment
Conclusion
Calcific tendinitis, while extremely painful during the acute resorptive phase, generally has an excellent prognosis. Understanding that the severe pain often indicates the body is actively removing the calcium deposit can provide reassurance during this difficult period. Most patients respond well to conservative treatment, particularly corticosteroid injections combined with NSAIDs and physical therapy. For those who don’t respond to conservative measures, advanced interventions like barbotage or surgery offer highly effective solutions. While the condition can be debilitating in the short term, the long-term outlook is very favorable, with most patients achieving complete resolution of symptoms and returning to full function. Work closely with your orthopedic specialist to develop the most appropriate treatment plan for your specific situation and stage of the condition.
