Subscap

[bedrock]

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I have a middle aged patient with significant calcification of the superior subscap tendon at the insertion.

I have only seen this in the supraspinatus previously.

How effective is ESWT for this area vs at SS?
Same question with ultrasound guided needling?
How often does these patients still need surgery?

Function significantly limited by pain so I did a SA injection today and sent for ESWT, but I want to be more prepared for the discussion when they return for follow up.

 

[DOctorJay]

I asked doximity ask as I haven't seen this clinically but find the question interesting...

ESWT and ultrasound-guided needling (UGN) demonstrate comparable midterm clinical outcomes for calcific tendinitis regardless of rotator cuff tendon location, with both modalities achieving excellent 5-year results (Constant-Murley scores ≈94 for ESWT vs ≈93 for UGN) [1]. High-energy ESWT (≥0.28 mJ/mm²) outperforms low-energy protocols for pain reduction and calcification resorption, with a dose-response relationship established in meta-analyses [2] [3]. UGN achieves superior radiographic deposit resolution compared to ESWT (mean size reduction 13 mm vs 6.7 mm at 1 year) and requires fewer additional treatments (22% vs 41%) [4]. Surgery is ultimately needed in approximately 10–15% of patients after failed nonoperative management, though 5-year outcomes between operative and nonoperative cohorts become similar due to the self-limiting nature of this condition [5] [6].

Efficacy by tendon location​

Calcific tendinitis of the subscapularis tendon is distinctly uncommon compared to supraspinatus involvement, with limited dedicated literature [7]. However, available evidence suggests mechanism of action and response to ESWT/UGN are consistent across rotator cuff tendons—the calcium hydroxyapatite crystal deposition responds to mechanical fragmentation (ESWT) or direct lavage (UGN) irrespective of anatomic site. The 2022 meta-analysis by Angileri et al. pooled all rotator cuff tendons without stratification by specific tendon, finding no outcome heterogeneity by location [8]. For subscapularis-specific cases, preoperative ultrasound marking significantly improves surgical localization and early clinical outcomes if operative intervention becomes necessary [9].

Comparative effectiveness: ESWT versus UGN​

Outcome measure	ESWT	UGN	Notes
Pain reduction (VAS)	-3.83 (95% CI -5.38, -2.27) [8]	-4.83 (95% CI -5.44, -4.22) [8]	UGN slightly superior
Functional improvement (CMS)	+18.3 points [8]	+22.0 points [8]	Comparable MCID achievement
Complete radiographic resorption	Variable (21–54% at 6–12 months) [10] [11]	67–85% [8]	UGN superior for deposit clearance
Additional treatment needed	41% at 1 year [4]	22% at 1 year [4]	UGN more definitive
5-year clinical outcomes	CMS 94.4 ± 6.4 [1]	CMS 93.3 ± 13.6 [1]	No significant difference

Surgical conversion rates and timing​

• Approximately 85–90% of patients achieve satisfactory outcomes without surgery when ESWT or UGN is employed after failed conservative management [12] [13]
• Surgery is indicated after 6 months of persistent symptoms despite nonoperative treatment, with arthroscopic deposit excision ± rotator cuff repair yielding good results [6] [14]
• The CALCECHO trial demonstrated that subacromial corticosteroid injection after UGN provides short-term pain benefit but does not affect 12-month calcification resorption rates (83% saline vs 74% steroid) [15]

Key considerations for your patient​

• Subscapularis location may warrant earlier imaging confirmation of deposit characteristics (Gärtner type I vs II) as this informs prognosis—type I (well-defined, dense) responds more favorably to both ESWT and UGN [16]
• Combination therapy (UGN + ESWT) shows superior radiographic outcomes at 12 months compared to either modality alone, though clinical pain/function differences are modest [17]
• Rehabilitation integration following ESWT or UGN improves scapulohumeral kinematics and may reduce recurrence risk [18]

Red flags requiring expedited surgical referral​

• Failure to improve after 6 months of appropriately dosed nonoperative treatment
• Progressive functional limitation despite compliant rehabilitation
• Gärtner type III (fluffy, ill-defined) calcifications—these show poorer response to ESWT and may benefit from earlier UGN or surgical consideration
• Associated full-thickness rotator cuff tear on imaging (present in ≈30% of surgical cohorts) [6]

Sources:

1. Comparable midterm outcomes for ultrasound-guided needling versus high-energy shockwave therapy for rotator cuff calcific tendinitis: a randomized controlled trial. Arthroscopy
2. High-energy versus low-energy extracorporeal shock wave therapy for calcifying tendinitis of the shoulder: which is superior? A meta-analysis. Clinical Orthopaedics and Related Research
3. Extracorporeal shock wave therapy for the treatment of chronic calcifying tendonitis of the rotator cuff: a randomized controlled trial. JAMA
4. Comparing ultrasound-guided needling combined with a subacromial corticosteroid injection versus high-energy extracorporeal shockwave therapy for calcific tendinitis of the rotator cuff: a randomized controlled trial. Arthroscopy
5. Rotator cuff calcific tendinitis: ultrasound-guided needling and lavage versus subacromial corticosteroids: five-year outcomes of a randomized controlled trial. The American Journal of Sports Medicine
6. Arthroscopic surgery versus nonoperative treatment for calcific tendinitis of the shoulder: a retrospective cohort study. The American Journal of Sports Medicine
7. Arthroscopic management of calcific tendinitis of the subscapularis tendon. Knee Surgery, Sports Traumatology, Arthroscopy
8. Chronic calcific tendonitis of the rotator cuff: a systematic review and meta-analysis of randomized controlled trials comparing operative and nonoperative interventions. Journal of Shoulder and Elbow Surgery
9. Value of preoperative ultrasound marking of calcium deposits in patients who require surgical treatment of calcific tendinitis of the shoulder. Arthroscopy
10. Extracorporeal shock wave therapy for calcifying tendinitis of the shoulder. Journal of Shoulder and Elbow Surgery
11. Medium-energy shock wave therapy in the treatment of rotator cuff calcifying tendinitis. Knee Surgery, Sports Traumatology, Arthroscopy
12. Calcific tendinitis of the shoulder. The Orthopedic Clinics of North America
13. Ultrasound-guided barbotage for calcific tendonitis of the shoulder: a systematic review including 908 patients. Arthroscopy
14. Arthroscopic removal and rotator cuff repair without acromioplasty for the treatment of symptomatic calcifying tendinitis of the supraspinatus tendon. Orthopaedic Journal of Sports Medicine
15. Are corticosteroid injections needed after needling and lavage of calcific tendinitis? Randomised, double – blind, non-inferiority trial. Annals of the Rheumatic Diseases
16. Radiological and clinical predictors of long-term outcome in rotator cuff calcific tendinitis. European Radiology
17. Ultrasound-guided needling combined with high-or low-energy extracorporeal shock wave therapy versus needling alone for calcified rotator cuff: a retrospective study. Orthopaedic Journal of Sports Medicine
18. Is extracorporeal shockwave therapy combined with isokinetic exercise more effective than extracorporeal shockwave therapy alone for subacromial impingement syndrome? A randomized clinical trial. The Journal of Orthopaedic and Sports Physical Therapy

 

[bedrock]

I asked doximity ask as I haven't seen this clinically by find the question interesting...

ESWT and ultrasound-guided needling (UGN) demonstrate comparable midterm clinical outcomes for calcific tendinitis regardless of rotator cuff tendon location, with both modalities achieving excellent 5-year results (Constant-Murley scores ≈94 for ESWT vs ≈93 for UGN) [1]. High-energy ESWT (≥0.28 mJ/mm²) outperforms low-energy protocols for pain reduction and calcification resorption, with a dose-response relationship established in meta-analyses [2] [3]. UGN achieves superior radiographic deposit resolution compared to ESWT (mean size reduction 13 mm vs 6.7 mm at 1 year) and requires fewer additional treatments (22% vs 41%) [4]. Surgery is ultimately needed in approximately 10–15% of patients after failed nonoperative management, though 5-year outcomes between operative and nonoperative cohorts become similar due to the self-limiting nature of this condition [5] [6].

Efficacy by tendon location​

Calcific tendinitis of the subscapularis tendon is distinctly uncommon compared to supraspinatus involvement, with limited dedicated literature [7]. However, available evidence suggests mechanism of action and response to ESWT/UGN are consistent across rotator cuff tendons—the calcium hydroxyapatite crystal deposition responds to mechanical fragmentation (ESWT) or direct lavage (UGN) irrespective of anatomic site. The 2022 meta-analysis by Angileri et al. pooled all rotator cuff tendons without stratification by specific tendon, finding no outcome heterogeneity by location [8]. For subscapularis-specific cases, preoperative ultrasound marking significantly improves surgical localization and early clinical outcomes if operative intervention becomes necessary [9].

Comparative effectiveness: ESWT versus UGN​

Outcome measure	ESWT	UGN	Notes
Pain reduction (VAS)	-3.83 (95% CI -5.38, -2.27) [8]	-4.83 (95% CI -5.44, -4.22) [8]	UGN slightly superior
Functional improvement (CMS)	+18.3 points [8]	+22.0 points [8]	Comparable MCID achievement
Complete radiographic resorption	Variable (21–54% at 6–12 months) [10] [11]	67–85% [8]	UGN superior for deposit clearance
Additional treatment needed	41% at 1 year [4]	22% at 1 year [4]	UGN more definitive
5-year clinical outcomes	CMS 94.4 ± 6.4 [1]	CMS 93.3 ± 13.6 [1]	No significant difference

Surgical conversion rates and timing​

• Approximately 85–90% of patients achieve satisfactory outcomes without surgery when ESWT or UGN is employed after failed conservative management [12] [13]
• Surgery is indicated after 6 months of persistent symptoms despite nonoperative treatment, with arthroscopic deposit excision ± rotator cuff repair yielding good results [6] [14]
• The CALCECHO trial demonstrated that subacromial corticosteroid injection after UGN provides short-term pain benefit but does not affect 12-month calcification resorption rates (83% saline vs 74% steroid) [15]

Key considerations for your patient​

• Subscapularis location may warrant earlier imaging confirmation of deposit characteristics (Gärtner type I vs II) as this informs prognosis—type I (well-defined, dense) responds more favorably to both ESWT and UGN [16]
• Combination therapy (UGN + ESWT) shows superior radiographic outcomes at 12 months compared to either modality alone, though clinical pain/function differences are modest [17]
• Rehabilitation integration following ESWT or UGN improves scapulohumeral kinematics and may reduce recurrence risk [18]

Red flags requiring expedited surgical referral​

• Failure to improve after 6 months of appropriately dosed nonoperative treatment
• Progressive functional limitation despite compliant rehabilitation
• Gärtner type III (fluffy, ill-defined) calcifications—these show poorer response to ESWT and may benefit from earlier UGN or surgical consideration
• Associated full-thickness rotator cuff tear on imaging (present in ≈30% of surgical cohorts) [6]

Sources:

1. Comparable midterm outcomes for ultrasound-guided needling versus high-energy shockwave therapy for rotator cuff calcific tendinitis: a randomized controlled trial. Arthroscopy
2. High-energy versus low-energy extracorporeal shock wave therapy for calcifying tendinitis of the shoulder: which is superior? A meta-analysis. Clinical Orthopaedics and Related Research
3. Extracorporeal shock wave therapy for the treatment of chronic calcifying tendonitis of the rotator cuff: a randomized controlled trial. JAMA
4. Comparing ultrasound-guided needling combined with a subacromial corticosteroid injection versus high-energy extracorporeal shockwave therapy for calcific tendinitis of the rotator cuff: a randomized controlled trial. Arthroscopy
5. Rotator cuff calcific tendinitis: ultrasound-guided needling and lavage versus subacromial corticosteroids: five-year outcomes of a randomized controlled trial. The American Journal of Sports Medicine
6. Arthroscopic surgery versus nonoperative treatment for calcific tendinitis of the shoulder: a retrospective cohort study. The American Journal of Sports Medicine
7. Arthroscopic management of calcific tendinitis of the subscapularis tendon. Knee Surgery, Sports Traumatology, Arthroscopy
8. Chronic calcific tendonitis of the rotator cuff: a systematic review and meta-analysis of randomized controlled trials comparing operative and nonoperative interventions. Journal of Shoulder and Elbow Surgery
9. Value of preoperative ultrasound marking of calcium deposits in patients who require surgical treatment of calcific tendinitis of the shoulder. Arthroscopy
10. Extracorporeal shock wave therapy for calcifying tendinitis of the shoulder. Journal of Shoulder and Elbow Surgery
11. Medium-energy shock wave therapy in the treatment of rotator cuff calcifying tendinitis. Knee Surgery, Sports Traumatology, Arthroscopy
12. Calcific tendinitis of the shoulder. The Orthopedic Clinics of North America
13. Ultrasound-guided barbotage for calcific tendonitis of the shoulder: a systematic review including 908 patients. Arthroscopy
14. Arthroscopic removal and rotator cuff repair without acromioplasty for the treatment of symptomatic calcifying tendinitis of the supraspinatus tendon. Orthopaedic Journal of Sports Medicine
15. Are corticosteroid injections needed after needling and lavage of calcific tendinitis? Randomised, double – blind, non-inferiority trial. Annals of the Rheumatic Diseases
16. Radiological and clinical predictors of long-term outcome in rotator cuff calcific tendinitis. European Radiology
17. Ultrasound-guided needling combined with high-or low-energy extracorporeal shock wave therapy versus needling alone for calcified rotator cuff: a retrospective study. Orthopaedic Journal of Sports Medicine
18. Is extracorporeal shockwave therapy combined with isokinetic exercise more effective than extracorporeal shockwave therapy alone for subacromial impingement syndrome? A randomized clinical trial. The Journal of Orthopaedic and Sports Physical Therapy

thanks. Appreciate the info.

No ultrasound at my practice as it’s not cost effective to buy a machine.
One thing that comes to mind is that it likely pays poorly for a doc to do ultrasound guided needling under insurance, and so its likely hard to find someone to do that outside of a residency program, which is more than 2 hrs from me.

If the patient doesn’t respond to ESWT, then UGN at residency program or surgery are likely their options under insurance. Outside of insurance, ultrasound guided needling done conjointly with cash PRP, probably offered by a private practice doc.

 

[mille125]

Shockwave by far.

Really effective for this.