Intramuscular migration of calcific tendinopathy in the rotator cuff: ultrasound appearance and a review of the literature

Nonsurgical removal of a massive calcification of the shoulder

Calcific tendinopathy of the shoulder is a prevalent and painful condition marked by calcific deposits in the rotator cuff tendons or subacromial bursa, with an incidence of 2.7% to 20%, predominantly affecting individuals aged 30 to 50. Women are 1.5 times more likely to be affected than men. Deposits are frequently bilateral in 10%-20% of cases and most commonly found in the supraspinatus tendon. The pathogenesis remains unclear, with theories suggesting repetitive strain or ischemic degeneration leading to calcium deposition. The disease progresses through precalcific, calcific, and postcalcific phases, with symptoms ranging from mild pain to severe, disabling pain resistant to medication. Diagnosis primarily involves radiographs or CT scans, with ultrasound aiding in deposit staging. Conservative treatments include medication, physiotherapy, and subacromial corticosteroid injections. Novel nonsurgical treatments like ultrasound-guided needling (UGN) and extracorporeal shock wave therapy (ESWT) have shown promise. When conservative measures fail, surgical options achieve significant improvement. This case report details a 53-year-old woman with a 12 cm calcification treated successfully with UGN, demonstrating the efficacy of this minimally invasive technique for large deposits.

Imaging of calcific tendinopathy: natural history, migration patterns, pitfalls, and management: a review

Calcific tendinopathy is characterized by the deposition of calcium hydroxyapatite crystals in various tendons of the body. Terms like calcium tendinitis, tendinosis, and tendinopathy are used interchangeably. Calcific tendinopathy is a common and well-documented ailment in the literature. Although common, the natural history, aetiology, and progression of calcific tendinitis are poorly understood. The treatment options include conservative and interventional measures. However, these measures cannot be applied as a blanket and are often tailored depending on the stage/phase of the disease. Out of the recognized stages of the disease, the resorptive stage causes the utmost symptoms when the calcium is rather soft and unstable. During this stage, the calcium may migrate beyond expected resorption and get deposited in the adjacent tissues contiguous with the calcium focus. The common destinations include bursal migration, intraosseous migration, muscular migration, and other less common migration sites. Such atypical presentations can lead to dilemmas in the diagnosis, prolongation of the diagnostic pathway, unwarranted apprehension, and treatment delay. Radiologists' role in this situation is to correctly recognize the imaging findings of atypical presentations of calcific tendinopathy and prevent unnecessary diagnostic and interventional studies. In this review article, we describe the pathogenic pathway and natural history of calcific tendinopathy from a radiologist's perspective and discuss different migratory patterns of calcium in calcific tendinopathy not only around the shoulder but also in other areas of the body on different imaging modalities. We also show a few examples of mimics and pitfalls on imaging. Finally, we discuss the appropriate management option of this condition.

Intramuscular migration of calcium deposits into the deltoid muscle: two cases of a rare complication of rotator cuff calcific tendinopathy

Rotator cuff calcific tendinopathy is a common non-traumatic shoulder pain condition that occurs predominantly in the supraspinatus tendon. Ultrasound-guided percutaneous irrigation of calcific tendinopathy (US-PICT) is a valid treatment in the resorptive phase. A complication of calcific tendinopathy is migration of calcium deposits outside the tendon. The most common site of migration is the subacromialsubdeltoid bursa (SASD). Another, but not frequent, type of migration is the intramuscular migration which mostly affects the supraspinatus, the infraspinatus and the biceps brachii muscles. This paper reports two cases of migration of calcification from the supraspinatus tendon to the deltoid muscle. The aforementioned site of migration has so far never been described in literature. Both patients presented calcification in the resorptive phase and therefore were treated by US-PICT.

Combined arthroscopic rotator cuff repair leads to better clinical outcomes than isolated removal of calcific deposits for shoulder calcific tendinitis: A 2- to 5-year follow-up study

Purpose

The optimal treatment procedure for shoulder calcific tendinitis (CT) remains controversial. This study aimed to assess the efficacy of arthroscopic treatment for CT, and to compare the clinical outcomes following combined rotator cuff repair and isolated removal of calcific deposits.

Methods

This retrospective cohort study included 46 patients (47 shoulders) with confirmed shoulder CT, and the diameter of the calcific deposit was over 1 cm. All patients suffered from CT for a mean period of 17.82 months and had a poor response to conservative treatment. With 12 males and 34 females included, the mean age was 53.94 years. After failed conservative treatment, 23 shoulders underwent combined rotator cuff repair (repair group), and 24 shoulders underwent isolated removal of calcific deposits (debridement group). The clinical outcomes were evaluated at baseline, 3, 6, and 12 months after the surgery and annually thereafter. The efficacy measures included the visual analog scale (VAS) pain score, American Shoulder and Elbow Surgeons (ASES) score, University of California at Los Angeles (UCLA) score and radiographic outcomes.

Results

Remarkable improvement in clinical outcomes at the final follow-up (2- to 5-year) compared with those at baseline were observed (p < 0.0001 for all outcomes). Compared with isolated removal of calcific deposits, combined rotator cuff repair led to worse postoperative 3- and 6-month VAS (p = 0.004 and p = 0.026, respectively), and 3-month ASES scores (p = 0.012). However, better VAS (p = 0.035 and p = 0.007, respectively) and ASES (p = 0.034 and p = 0.020, respectively) scores at 24-month and final follow-up were found in the repair group. All these differences reached the minimal clinical important difference (MCID). MRI scans at the final follow-up showed significantly better outcomes in patients with rotator cuff repair (p = 0.021).

Conclusions

Arthroscopic removal of calcific deposits is safe and effective for treating CT. Compared with isolated debridement, combined rotator cuff repair led to worse short-term (<12 months) but better medium- (12-48 months) to long-term (≥48 months) improvements in pain, function and integrity of tendons.

Calcific tendinopathy of the pronator quadratus muscle: A rare site and cause of ulnar sided wrist pain

Ulnar -sided wrist pain is a common complaint and can present a diagnostic challenge for a musculoskeletal clinician. Calcific tendinopathy is a well-recognised disorder related to the deposition of calcium hydroxyapatite crystals within tendons. Classically, tendons around the shoulder and the hip joints are the most commonly affected sites. We report a rare site of calcific tendinopathy of the Pronator Quadratus muscle presenting with ulnar-sided wrist pain in a 36-year-old male posing a diagnostic dilemma. This case-report highlights the importance of a thorough clinical evaluation and crucial role of cross-sectional imaging in reaching a diagnosis of calcific tendinopathy of the Pronator Quadratus muscle as unusual cause of ulnar-sided wrist pain. This is the first reported case of calcific tendinopathy in pronator quadratus in the literature we could review.

Extratendinous migration of calcific tendinitis of the rotator cuff: imaging findings and clinical characteristics with temporal changes

Purpose

The aim of this study was to analyze the imaging findings and clinical characteristics of extratendinous migration of calcific tendinitis of the shoulder with temporal changes.

Methods

Seventy-six patients with extratendinous calcific tendinitis of the shoulder diagnosed by ultrasonography (US) or magnetic resonance imaging (MRI) were enrolled in this retrospective study. Clinical symptoms and imaging findings (on radiography, US, and MRI) of extratendinous calcific tendinitis during an acute painful attack were analyzed. Temporal changes were analyzed in 28 patients before an acute attack and 40 patients after an acute attack. For comparison, 65 patients with intratendinous calcific tendinitis were included.

Results

Patients with extratendinous calcific tendinitis had a significantly higher average visual analogue scale (VAS) score (8.8±1.6) than the intratendinous group (6.4±2.2) (P<0.001). The fragmented type (80.5%) was the most common shape on US; sonographic black hole appearance (14.6%) and echogenic fluid (9.8%) were characteristic findings of intrabursal calcifications. In 28 patients with previous radiographs, radiographic type III (78.6%) was dominant and the location of calcific deposits changed (82.1%) during the acute painful attack, which was also perceivable in 12 patients with previous US or MRI. In follow-up radiographs of 40 patients, calcifications shrunk by more than 50% or became invisible in 82.5% of patients, with symptom improvement (VAS score, 8.9±1.5 to 1.9±1.2). Follow-up US and MRI of 16 patients also showed decreased size (56.3%) or disappearance (43.7%) of calcific deposits.

Conclusion

Extratendinous calcific tendinitis has distinctive imaging features, the temporal changes of which correlate well with clinical symptoms.

Magnetic resonance imaging evaluation of the correlation between calcific tendinitis and rotator cuff injury

BACKGROUND

This study aims to evaluate the incidence of calcific tendinitis (CaT) in rotator cuff tears (RCTs) and to assess the correlation between CaT and RCTs with magnetic resonance imaging (MRI).

METHODS

The MRI of 108 patients with rotator cuff CaT admitted to our hospital from January 2019 to January 2021 were retrospectively analyzed. Another retrospective analysis was made of 108 patients with similar age, gender, occupation, and shoulder injury side to those in the first group. The incidence of RCTs and their correlation with CaT were assessed based on an MRI of shoulder joints.

RESULTS

There was a statistical difference (p < 0.05) in the incidence of RCTs between the CaT group (23.4%) and the control group (37.2%). No significant difference was observed in the size of the RCTs between the two groups (P = 0.422). In the CaT group, 17.4% of patients had complete tears, compared with 26.3% in the control group. There was no significant correlation between the calcification site and RCTs in the CaT group, and only 3.7% of patients suffered calcification and a tear in the exact location of the same tendon (P > 0.05, r = 0.03).

CONCLUSIONS

Compared with patients with shoulder pain without CaT, patients with rotator cuff CaT suffered no increased risk of RCTs on MRI, so CaT and RCTs may have different pathological causes, and there is no significant correlation between the two.

Calcific tendinopathy of the rotator cuff: a review of operative versus nonoperative management

Calcific tendinopathy of the shoulder involves calcification and degeneration of the rotator cuff tendon near its insertion point on the greater tuberosity. The purpose of this review is to analyze recent literature evaluating the clinical outcomes of non-operative and operative treatment for calcific tendinopathy of the shoulder. Conservative management, extracorporeal shockwave therapy (ESWT), ultrasound-guided percutaneous irrigation of calcific tendinopathy (US-PICT), and surgical intervention will be reviewed.

Calcific tendinitis: intramuscular and intraosseous migration

Calcific tendinitis is a well-documented and extensively studied disease in the literature. Intramuscular and intraosseous migration are rare complications, which may present diagnostic challenges. This pictorial essay illustrates the imaging findings of these complications. Considering that neoplastic processes and infectious diseases are included in the differential diagnosis, recognizing the imaging findings of these complications is of critical importance.

Arthroscopic Treatment of an Unusual Intramuscular Calcium Hydroxyapatite Crystal Deposit on the Rotator Cuff

Hydroxyapatite crystal deposition disease and its pathophysiology are poorly understood; however, it is known that calcific tendinitis is the most common condition related to this deposition in the upper limb. Movement of the crystals toward the myotendinous junction is rare; to the best of our knowledge, only 19 cases have been described in the literature, one of which was a case of intramuscular deposition without migration. The purpose of this technical note is to describe the technical details of the arthroscopic treatment of intramuscular calcium hydroxyapatite deposits without intratendinous migration.

Calcium hydroxyapatite deposition disease: Imaging features and presentations mimicking other pathologies

OBJECTIVE

Calcium hydroxyapatite depositional disease (HADD) is usually asymptomatic and self-limiting; however, when there is an associated inflammatory process or HADD occurs in an unusual location, it may mimic trauma, infection, or neoplasm. The purpose of this article is to review the imaging features of HADD and how to distinguish it from more worrisome entities that can have similar appearances.

CONCLUSION

An understanding of the presentations of HADD is important to allow early and confident diagnosis. In particular, familiarity with presentations that resemble more ominous pathologies is essential to avoid costly and time-consuming workup or intervention.

Ultrasound Appearance of the Migration of Tendon Calcifications

Calcific tendinopathy (CTe) is a frequent disorder related to the deposition of calcium hydroxyapatite crystals within tendons. Ultrasound has been shown to be an excellent imaging modality for the evaluation of CTe. During the resorptive phase of CTe, calcium deposits may migrate inside the tendons or in neighboring tissues and lead to local inflammation and severe pain. In this pictorial essay, we describe the ultrasound appearance of a spectrum of CTe migrations. Knowledge of the different migration patterns can help sonologists in their detection and in establishing the correct diagnosis.

Calcific tendinopathy of the direct head of rectus femoris: a rare cause of groin pain treated with ultrasound guided percutaneous irrigation

Groin pain can be caused by a myriad of pathologies. Abnormalities of the rectus femoris are a very rare cause of groin pain; calcific tendinopathy of the direct head is particularly so, with only two case reports in the literature. We report the first case of calcific tendinopathy of the direct head of the rectus femoris that was treated effectively with ultrasound-guided percutaneous irrigation of calcific tendinopathy (USPICT). The anatomy of the rectus femoris and the technique for US-PICT of the rectus femoris are also described.