Ultrasound therapy led to clinical improvement in calcific shoulder tendinitis
ACP J Club. 1999 Nov-Dec;131:73. doi:10.7326/ACPJC-1999-131-3-073
Ebenbichler GR, Erdogmus CB, Resch KL, et al. Ultrasound therapy for calcific tendinitis of the shoulder. N Engl J Med. 1999 May 20;340: 1533-8.
In patients with calcific tendinitis of the shoulder, is pulsed ultrasound therapy clinically effective?
Randomized (allocation concealed), double-blind, placebo-controlled trial with 9-month follow-up.
Outpatient clinic at a university hospital in Vienna, Austria.
63 patients (mean age 52 y) with unilateral or bilateral, radiographically dense (Gartner and Heyer classification type 1 or 2) calcific tendinitis of the shoulder (70 shoulders were included). Exclusion criteria were radiographically nondense, ill-defined calcific tendinitis (type 3); systemic diseases associated with calcification; previous surgery, percutaneous needle aspiration, ultrasound, or shock-wave therapy for calcifications; injection of glucocorticoids in the shoulder in the previous 3 months; or regular use of analgesic or anti-inflammatory drugs. 61 shoulders (87%) at the end of therapy and 56 shoulders (80%) at 9 months were included in the analysis.
Shoulders were allocated to ultrasound therapy (n = 32) or to sham therapy (n = 29). Ultrasound therapy consisted of 15-minute sessions given daily (5 times/wk) for the first 15 sessions and 3 times weekly for 3 weeks thereafter. Sham therapy was given in the same way but without turning on the ultrasonic generator.
Main outcome measures
Changes from baseline in shoulder calcium deposits on radiography. Pain, active range of motion and power of shoulder, and activities of daily living (ADLs) were assessed with the Constant scale (range 0 to 100 [optimal score] points). Quality of life was assessed with a visual analogue scale (range 0 [optimal score] to 10 cm).
More shoulders showed complete resolution of calcium deposits at the end of treatment (P = 0.003) and at 9 months (P = 0.002) in the ultrasound therapy group than in the sham therapy group (Table). Ultrasound therapy led to greater improvement in pain, joint function, and ADLs (mean change in score 17.8 vs 3.7, P = 0.002) (Table) and quality of life (mean change in score 2.6 vs 0.4, P = 0.002) than did sham therapy at the end of treatment but not at 9 months.
In patients with calcific tendinitis of the shoulder, pulsed ultrasound was clinically effective, but only in the short term.
Source of funding: Not stated.
For correspondence: Dr. G.R. Ebenbichler, Department of Physical Medicine and Rehabilitation, University Hospital of Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria. FAX 43-1-40400-5280.
Table. Ultrasound vs sham therapy for calcific tendinitis of the shoulder*
|Outcomes||Ultrasound||Sham||RBI (95% CI)||NNT (CI)|
|Resolution after therapy||19%||0%||Infinity||6 (4 to 20)|
|Resolution at 9 mo||42%||8%||424% (53 to 1880)||3 (2 to 9)|
|Normal constant score after therapy||75%||34%||118% (33 to 287)||3 (2 to 7)|
|Normal constant score at 9 mo||61%||48%||28% (-21 to 117)||Not significant|
*Abbreviations defined in Glossary; RBI, NNT, and CI calculated from data in article.
The results of this well-designed study by Ebenbichler and colleagues are similar to studies comparing therapeutic doses of extracorporeal shock-wave therapy (1).
The natural history of rotator-cuff calcification is not well understood. Calcifications are probably most symptomatic during resorption (2). One retrospective study showed that if acromioplasty is done without removing rotator-cuff calcifications, 82% of these calcifications will have disappeared radiographically within 1 year of surgery (3).
In my experience using dynamic high-resolution ultrasound, pain from supraspinatus calcification usually coincides with impingement of the calcified area on the subacromial arch. In addition, hyperemia or inflammation exists in the bursae and tendons adjacent to symptomatic areas of supraspinatus calcification shown on color Doppler ultrasonography and contrast-enhanced, fat-suppressed magnetic resonance imaging. A possible explanation of the short-term benefit of ultrasound therapy in patients with symptomatic supraspinatus calcification is that it helps reduce the local soft-tissue inflammatory process, which subsequently reduces the mass effect of the calcification. If, however, the underlying cause of the local tendon injury is not removed, symptoms will return; this may explain the lack of difference between the 2 groups in pain and quality of life at 9 months.
In conclusion, ultrasound therapy is noninvasive and clinically effective for treating symptomatic calcific tendinitis.
Wayne W. Gibbon, FRCS
United Leeds Teaching Hospitals NHS TrustLeeds, England, UK
3. Goutallier D, Duparc F, Postel JM, Bernageau J, Allain J. Isolated subacromial decompression for the treatment of chronic shoulder pain with rotator cuff calcification. A review of twenty-seven shoulders, including eighteen evaluated by magnetic resonance imaging after surgery. Rev Rhum Engl Ed. 1996;63:349-57.