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Sonographic evaluation of shoulder joint pain with MRI correlation.

BACKGROUND

Shoulder pain is one of the most common complaints encountered in clinical practice. It is also the commonest musculoskeletal ultrasound examination request. It often leads to considerable disability; hence an early diagnosis allows proper surgical treatment planning that can prevent functional impairment.

Rotator cuff disease may result from a variety of causes including degenerative, repetitive overhead activities at work or through involvement in sports or due to trauma. The most common causes of a painful shoulder include periarticular soft tissue lesions involving tendons and bursae and are often associated with chronic impingement of the rotator cuff on the anterolateral margin of the acromion. Magnetic Resonance Imaging (MRI) is the state-of-the-art diagnostic tool for evaluation of the shoulder. It allows the evaluation of the bone marrow, tendons, muscles, ligaments, capsules and bursae, but its limitations lie in the evaluation of the labrum and glenohumeral ligaments for which MRI arthrography is the study of choice.

Improvement in the resolution of USG machines, refined techniques and better understanding of the pathology have contributed to high accuracy in the diagnosis of rotator cuff pathology. With an experienced sonologist and good equipment, accuracy of USG equals that of MRI for full-thickness tears and is slightly better than MRI for partial-thickness tears. USG's real-time capability, low cost and dynamic nature makes it the preferred imaging modality over MRI in several institutes.

Aims and Objectives

* Evaluation of shoulder joint pain with USG as the first line of imaging emphasising on rotator cuff pathology.

* Correlation of the accuracy of USG with that of MRI in the evaluation of rotator cuff pathologies.

* To delineate pitfalls and limitation of USG when compared with MRI during image interpretation of rotator cuff pathologies in a patient with shoulder pain.

MATERIALS AND METHODS

The present study was a case series study carried out at Katuri Medical College and Hospital in the Department of Radiodiagnosis, which included 50 patients with the complaint of shoulder joint pain with suspected rotator cuff pathologies who were evaluated with ultrasound examination, which was further followed by MRI and the results were compared and analysed for significance. The following inclusion and exclusion criteria were taken into confidence.

Inclusion Criteria

The study includes,

* All patients with shoulder pain with a clinical suspicion of rotator cuff injuries.

* All age groups irrespective of sex.

Exclusion Criteria

The study excludes,

* Patient having history of previous surgery with placement of prosthesis, cardiac pacemakers and metallic foreign body in situ.

* Patient having history of claustrophobia.

* Known cases of rheumatoid arthritis.

Machines Used

USG- Philips Envisor, GE LOGIQ F8.

MRI- GE 0.2 Tesla machine.

Ultrasound Technique

Shoulder ultrasound was performed using a high frequency (5-12 MHz) linear array probe with tissue harmonic imaging. Patient was made to sit on a rotating stool facing the examiner close to the USG machine. Both static and dynamic assessment of the affected shoulder in comparison with the normal shoulder was done.

The following structures were examined: Biceps tendon, subscapularis, supraspinatus (including test for impingement), infraspinatus, teres minor, posterior glenoid labrum and glenohumeral space, coracoacromial ligament and finally the acromioclavicular joint.

MRI

Imaging was done with 0.2 Tesla GE machine using shoulder coil. The following sequences were selected as required.

* Coronal oblique T1W/ PD Fast Spin Echo (FSE) sequence.

* Coronal oblique STIR sequence.

* Sagittal oblique T2W FSE sequence.

* Axial T2WI.

* Axial PDW FSE.

* Field of view 20 x 20 cm, slice thickness 4 mm and matrix- 256 x 160.

Statistical Methods

Significance is assessed at 5% level of significance. Spearman correlation and Kappa coefficient has been used to find the significance of study parameters on categorical scale between two or more groups. Diagnostic statistics like Sensitivity, Specificity, PPV, NPV and Accuracy have been computed to find the correlation of USG with MRI findings.

RESULTS

50 patients with the complaint of shoulder joint pain were evaluated using ultrasound, which was further followed by MRI.

DISCUSSION

A prospective study of 50 patients with shoulder pain with a clinical suspicion of rotator cuff tear was undertaken. USG examination of the affected shoulder was done in comparison with the normal shoulder and the findings were correlated with the subsequent MRI findings.

Age Group Wise Incidence

The age group of the study was from 21-80 years with maximum number of patients being of the age between 40 60 years constituting 68% of the study population. Hiroshi Minagawa et al [1] studied the prevalence of tears in general population and found that the prevalence in each decade was 0% in the 20s to 40s, 10.7% in the 50s, 15.2% in the 60s, 26.5% in the 70s and 36.6% in the 80s, whereas in our study it was 8% in the 20s, 14% in the 30s, 30% in the 40s, 38% in 50s, 6% in 60s, 4% in 70s. In their study, the prevalence increased with age in general population. In our study, the prevalence increased with age till the 50s and then declined. The discrepancy in the prevalence in our study is probably related to the selection bias as our study was on the symptomatic patients reaching the hospital, whereas the study done by Hiroshi Minagawa et al was on the general population in a village.

Gender Distribution

Of the 50 patients 34 (68%) were males and the rest 16 (32%) were females, indicating a male predominance. The number of males in the age groups from 21-80 were more than double the number of females in the same age group. The number of males were higher than the number of females in the age group from 21-70, but in the age group from 71-80 the number of males and females were equal. This was similar to the prevalence study done by Hiroshi Minagawa et al, [1] where the prevalence of tear was significantly greater in male than in female in the 50s and 60s, but not in the 70s and 80s.

Side of Pathology

The number of patients with pathology on the right side was 30 accounting for 60% of the cases, whereas those with left-sided shoulder pathologies accounted for 20 (40%) of the cases.

Duration of Symptoms

More than half of the cases (27 out of 50 patients- 54%) had an acute history of less than 1 month before presenting for an USG examination; 19 (38%) of the cases had a history of 1-6 months duration and only 4 (8%) had a history of more than 6 months.

Pathology

Rotator cuff pathologies include partial, full thickness, intrasubstance tears and tendinosis. Supraspinatus tendon was the commonest tendon to be involved. USG detected 35 cases (70%) patients and MRI detected 38 patients with supraspinatus tendon pathologies. This is comparable to the study by Zlatkin et al, [2] wherein they found that supraspinatus tendon involvement was present in around 80% of their cases.

Supraspinatus

The sensitivity and specificity of USG in detection of supraspinatus pathologies were 92.11% and 100% respectively. The positive predictive value was 100% and negative predictive value was 80%. Accuracy of the study was 94%. Spearman correlation value of p was < 0.001 and Kappa coefficient was 0.848 indicating that the value obtained was almost perfect.

Partial Thickness Tears

In our study, sensitivity and specificity values for partial thickness tear of supraspinatus was 80% and 100%.

Our study showed a high specificity of 100% for partial thickness tears. The specificity findings were comparable with the study done by Read, John W and Mark Perko, [3] in which the specificity of ultrasound for partial thickness tears was 97%. Similarly, our results for sensitivity of partial thickness tears were also comparable with the results of Rutten et al [4] whose study showed a sensitivity of 89% for partial thickness tears on ultrasound compared with the 80% sensitivity in our study.

Cullen et al [5] compared the ultrasound and surgical results obtained from 68 patients. In their study, ultrasound showed a sensitivity of 79% and specificity of 94% (Positive Predictive value 87%) for partial-thickness tears, which was comparable with our study. They found that shoulder ultrasound in the hands of an experienced radiologist with the use of modern high-resolution equipment is highly sensitive in differentiating complete tears and partial-thickness tears. Our results for partial thickness tears were comparable with the results of their study.

Van-Holsbeeck et al [6] (Van-Holsbeeck Kolowich 1995) [6] described that the sensitivity of US in depiction of partial-thickness tears was 93% and specificity was 94%. The positive predictive value was 82% and the negative predictive value was 98%.

Full Thickness Tears

Sensitivity and specificity values for full thickness tear of supraspinatus were 100% and 95.35%. The findings of our study were comparable with the study done by Read, John W [3] and Mark Perko in 1998. They studied the findings in 42 consecutive surgical cases and compared them with the preoperative sonographic readings. Ultrasound detected all of the 10 full-thickness cuff tears identified at surgery (Sensitivity 1.0, specificity 0.97), but detected only 6 of 13 partial-thickness cuff tears (sensitivity 0.46, specificity 0.97). They concluded that ultrasound is a sensitive and accurate method of identifying patients with full-thickness tears of the rotator cuff, extracapsular biceps tendon pathology or both. Similarly, our study showed a high sensitivity of 100% and specificity of 95.35% for full thickness tears.

Cullen et al [5] showed a sensitivity of 89% and specificity of 100% (Positive Predictive value 100%) for full-thickness tears using ultrasound. They showed a high specificity of 100%, whereas in our study specificity was 95.35%. This was attributable to the false positive cases of full thickness tears on ultrasound, which were proven to be partial thickness tears on MRI. There are pitfalls with ultrasound, which give rise to such false positive cases.

Accuracy

PPV, NPV for partial thickness and full thickness tears were 100%, 83.33%, 77.78% and 100% respectively.

In our study, the accuracy values for partial thickness and full thickness tears of supraspinatus were 90% and 96%. This was comparable with the study done by Anastasia N. Fotiadou et al. [7] Anastasia N. Fotiadou et al [7] studied ninety-six patients with clinically suspected rotator cuff pathology using USG and MRI. The accuracy in the detection of full-thickness tears was 98% and 100% for ultrasonography and magnetic resonance imaging respectively. The accuracy in the detection of bursal or articular partial-thickness tears was 87% and 90% for ultrasonography and magnetic resonance imaging respectively. They concluded that in experienced hands, ultrasonography should be considered.

Spearman Correlation and Kappa Statistic

The tests of significance- the spearman correlation and the Kappa statistic values for partial thickness and full thickness tears were 0.800 (substantial association), 0.852 (almost perfect association) indicating that the values obtained are significant.

This was comparable with the study done by Shahnawaz Bashir et al. [8] Shahnawaz Bashir et al [8] studied 50 patients, out of which a total of 34 patients were diagnosed as having rotator cuff tears on ultrasound, while 16 patients were normal. When MRI examination was conducted in these patients it showed 38 cases of rotator cuff tears, while 12 patients were diagnosed as normal. The agreement between the two methods was assessed using Kappa coefficient. The strength of agreement between USG and MRI for the diagnosis of rotator cuff tears was found to be 'very good.'

Biceps Tendon

The pathologies of biceps tendon in our study included tendinosis alone with no case of tear/dislocation. Sensitivity and specificity values for Biceps tendon pathologies were 66.67% and 97.87%, which were comparable with that of the study done by Shih-Wei et al. [9]

Shih-Wei Huang et al [9] studied a total of 336 shoulder pain patients with suspected biceps tendinitis, of which a total of 136 patients were classified with biceps tendinitis and 200 patients were classified as not having biceps tendinitis based on the diagnostic criteria. The sensitivity was 68% and the specificity was 90% in the standard deviation of the transverse view, and the sensitivity was 81% and the specificity was 73% in the standard deviation of the longitudinal view to diagnose biceps tendinitis.

PPV of 66.67%, NPV of 97.87%, accuracy of 96%, p value of spearman correlation < 0.001, significant and Kappa coefficient was 0.645 suggesting a substantial association.

Subscapularis

Sensitivity and specificity values for subscapularis pathologies was 50% and 97.92%, PPV of 50%, NPV of 97.92%, accuracy of 94%, p value of spearman correlation <0.001, significant and Kappa coefficient was 0.315 suggesting a fair association.

Infraspinatus and Teres Minor

No pathology of infraspinatus and teres minor was observed on either USG or MRI giving them the specificity, negative predictive value and accuracy of 100%.

Peribicipital Tendon Fluid

Sensitivity and specificity values for peribicipital fluid was 51.28% and 100%, PPV of 100%, NPV of 36.67%, accuracy of 62%, p value of spearman correlation 0.012, significant and Kappa coefficient was 0.317 suggesting a fair association.

Subacromial Subdeltoid Bursitis

Sensitivity and specificity values for subacromial, subdeltoid bursitis was 25% and 86.36%, PPV of 70%, NPV of 47.5%, accuracy of 52%, p value of spearman correlation 0.119, nonsignificant and Kappa coefficient was 0.104 suggesting a slight association. Therefore, for detection of peribicipital fluid and subacromial subdeltoid bursitis, MRI is the preferred modality over USG as ultrasound has very low sensitivity.

Four cases had calcifications on ultrasound and only one of them observed on MRI.

Ultrasound can be used for the initial investigation of suspected rotator cuff pathologies. Advantages of ultrasound are non-invasive, real time, low cost, no radiation and the advantage of dynamic examination and comparison with the normal side. However, it has the following pitfalls.

The pitfalls in ultrasound evaluation of rotator cuff pathologies on shoulder include those related to anisotropy, calcific tendinitis complex anatomy in the region of the rotator interval and tendinous interdigitation.

* The rotator cuff appears echogenic when the angle of insonation is perpendicular or near perpendicular to the surface. Minor deviation from this orientation results in a false positive appearance of a tear.

* Intratendinous deposition of calcium is manifested by both focal echogenicity and acoustical shadowing. Failure to recognise these coexistent findings may result in inadvertent misinterpretation of the hypoechoic, shadowing zone as a rotator cuff tear.

* The rotator interval, which is normally devoid of cuff tissue may be mistaken for a rotator cuff defect.

* The edge of the intraarticular biceps tendon may be mistaken for a torn and retracted cuff tear. The hypoechoic interface between the biceps and adjacent supraspinatus tendons may simulate a longitudinal cuff tear.

* Heterogeneity of the normal rotator cuff can be normally observed, because of the complex interdigitation of fibres from the various contributions.

* Steep learning curve and interobserver variation in results.

Even MRI has its own Limitations and Pitfalls

The limitations are claustrophobia, obese patients, post-surgical metallic implant fixations.

Pitfalls of MR imaging include the magic angle effect and normal fibre interdigitation. Tendons that course at or near the magic angle of 55[degrees] exhibit markedly augmented signal intensity that is most pronounced with short-echo-time sequences. The supraspinatus tendon is particularly vulnerable, since it curves along its course between the musculotendinous junction and its insertion on fibrocartilage. Furthermore, magic angle augmentation of signal intensity within the biceps tendon may be misinterpreted as focal cuff pathologic conditions near the rotator interval. The complex arrangement of rotator cuff fibres is frequently manifested by striations that may be mistaken for intrasubstance tears.

CONCLUSION

In our study of 50 patients with suspected rotator cuff pathology, ultrasound demonstrated a high sensitivity and specificity more so for supraspinatus tendon pathologies and least for peribicipital tendon fluid collection and SASD bursitis. Also, USG is a reliable dynamic diagnostic tool and provides direct correlation of the imaging findings with the symptoms of the patient, and helps with guided interventional procedures. Therefore, it should be considered as an accurate modality for the initial investigation of rotator cuff, especially supraspinatus tears. MRI is preferably done after sonography in doubtful cases or for evaluation of other pathologies of the shoulder joint like labral pathologies.

DOI: 10.14260/jemds/2017/649

REFERENCES

[1] Minagawa H, Yamamoto N, Abe H, et al. Prevalence of symptomatic and asymptomatic rotator cuff tears in the general population: From mass-screening in one village. J Orthop 2013;10(1):8-12.

[2] Zlatkin MB, Iannotti JP, Roberts MC, et al. Rotator cuff tears: diagnostic performance of MRI. Radiology 1989;172(1):223-9.

[3] John RW, Perko M. Shoulder ultrasound: diagnostic accuracy for impingement syndrome, rotator cuff tear, and biceps tendon pathology. Journal of Shoulder and Elbow Surgery 1998;7(3):264-271.

[4] Rutten MJ, Spaargaren GJ, van Loon T, et al. Detection of rotator cuff tears: the value of MRI following ultrasound. European Radiology 2010;20(2):450-7.

[5] Cullen DM, Breidahl WH, Janes GC. Diagnostic accuracy of shoulder ultrasound performed by a single operator. Australas Radiol 2007;51(3):226-9.

[6] van Holsbeeck MT, Kolowich PA, Eyler WR, et al. US depiction of partial-thickness tear of the rotator cuff. Radiology 1995;197(2):443-6.

[7] Vlychou M, Dailiana Z, Fotiadou A, et al. Symptomatic partial rotator cuff tears: diagnostic performance of ultrasound and magnetic resonance imaging with surgical correlation. Acta Radiol 2009;50(1):101-5.

[8] Bashir S, Firdose SR, Kamal Y, et al. Correlation between high resolution ultrasonography and MRI in rotator cuff tear diagnosis. International Journal of Health Sciences and Research (IJHSR) 2014;4(8): 103-12.

[9] Huang SW, Wang WT. Quantitative diagnostic method for biceps long head tendinitis by using ultrasound. The Scientific World Journal 2013;2013:948323.

Ramakrishna Narra (1), Varunya Mary Jehendren (2), Johny Prasad Bollipo (3), Anusha Putcha (4)

(1) Associate Professor, Department of Radiodiagnosis, Katuri Medical College, Chinnakondrupadu, Guntur.

(2) Senior Resident, Department of Radiodiagnosis, Katuri Medical College, Chinnakondrupadu, Guntur.

(3) Assistant Professor, Department of Radiodiagnosis, Katuri Medical College, Chinnakondrupadu, Guntur.

(4) Junior Resident, Department of Radiodiagnosis, Katuri Medical College, Chinnakondrupadu, Guntur.

HOW TO CITE THIS ARTICLE: Narra R, Jehendren VM, Bollipo JP, et al. Sonographic evaluation of shoulder joint pain with MRI correlation. J. Evolution Med. Dent. Sci. 2017;6(37):3007-3013, DOI: 10.14260/Jemds/2017/649

Financial or Other, Competing Interest: None.

Submission 18-03-2017, Peer Review 24-04-2017, Acceptance 01-05-2017, Published 08-05-2017.

Corresponding Author:

Dr. Ramakrishna Narra, Flat No. 30, 5 FIoor, Venkatesh Estate Apartment, 1/2 Chandramouli Nagar, Guntur-522006, Andhra Pradesh.

E-mail: narra.ramki29@gmail.com

Caption: Figure 1. USG Axial and Longitudinal Views of Biceps Tendon showing Peribicipital Fluid Collection (Arrows)

Caption: Figure 2. USG Supraspinatus Tendon showing Partial Thickness Tears

Caption: Figure 3. USG- Comparison of both Shoulders in a Patient-Normal SS on the Left and SS Partial Thickness Tear on the Right

Caption: Figure 4. USG Supraspinatus Tendon showing Heterogeneity of Tendon with Calcification-a Case of Calcific Tendinitis

Caption: Figure 5. MRI Coronal T2WI showing Complete Tear of Supraspinatus Tendon

Caption: Figure 6. MRI Axial T2WI showing Spinoglenoid Notch Cyst

Caption: Figure 7. MRI T2WI, STIR Coronal showing Hyperintensity in the Supraspinatus Tendon- S/O Tendinosis
Table 1. Age Distribution

 Age    Male   Female   Total   Percentage

21-30    3       1       4          8
31-40    3       4       7         14
41-50    11      4       15        30
51-60    13      6       19        38
61-70    3       0       3          6
71-80    1       1       2          4

Table 2. Gender Distribution

         Number of
Gender   Patients    Percentage

 Male        34          68
Female       16          32
 Total       50          100


Table 3. Ultrasound Findings- Pathology (Tears)

   Tendons      Partial     Full      Intra-
                Thickness  Thickness  Substance  Tendinosis  Normal

Subscapularis      2          0          0           0        48
                  (4%)                                       (96%)
Supraspinatus     20          9          0          7         14
                 (40%)      (18%)                  (14%)     (28%)
Infraspinatus      0          0          0           0        50
                                                             (100%)
 Teres Minor       0          0          0           0        50
                                                             (100%)
   Biceps          0          0          0        3 (6%)      47
                                                             (94%)

Table 4. USG Finding of Peribicipital Tendon Fluid

           Number of
Criteria   Patients    %

Present       20       40
 Absent       30       60

Table 5. Ultrasound Findings- Bursal Fluid/Bursitis

Bursal Fluid/            Number of
  Bursitis     Criteria  Patients    %

    SASD       Absent       40      80%
               Present      10      20%

Table 6. MRI Findings of Tendon Tears

                Partial     Full      Intra-
   Tendons      Thickness  Thickness  Substance  Tendinosis  Normal

Subscapularis      2          0          0          1         47
                  (4%)                             (2%)      (94%)
Supraspinatus     25          7          0          7         11
                 (50%)      (14%)                  (14%)     (22%)
Infraspinatus      0          0          0           0        50
                                                             (100%)
 Teres Minor       0          0          0           0        50
                                                             (100%)
   Biceps          0          0          0        3 (6%)      47
                                                             (94%)

Table 7. MRI Findings- Peribicipitai Tendon Fluid

           Number of
Criteria   Patients    %

Present       39       78
 Absent       11       22

Table 8. MRI other Findings

                                    No. of
         Other Findings             Patients  Percentage

     No Other Findings (NIL)          46         92
  Spinoglenoid Notch Cyst (SGC)        1          2
  Calcification in Tendon (CA)         1          2
Axillary Lymphadenopathy (AX.LAD)      2          4

Table 9. Correlation of USG and MRI Findings

                                                        Detection
                                                        Rate by
Sl. No.           Pathology             TP  FP  FN  TN    USG

   1            Subscapularis           1   1   1   47     4%
   2            Supraspinatus           35  0   3   12    70%
   3            Infraspinatus           0   0   0   50     0%
   4             Teres Minor            0   0   0   50     0%
   5            Biceps Tendon           2   1   1   46     6%
   6       Peribicipital Tendon Fluid   20  0   19  11    40%
   7            SASD Bursitis           7   3   21  19    20%

           Detection
           Rate by
Sl. No.      MRI

   1          4%
   2         76%
   3          0%
   4          0%
   5          6%
   6         78%
   7         56%

Table 10. Correlation of USG with MRI Findings- Statistical
Significance

Sl. No.            Pathology             Sensitivity  Specificity

   1             Subscapularis              50%        97.92%
   2             Supraspinatus            92.11%        100%
   3             Infraspinatus              --          100%
   4              Teres Minor               --          100%
   5             Biceps Tendon            66.67%       97.87%
   6        Peribicipital Tendon Fluid    51.28%        100%
   7             SASD Bursitis              25%        86.36%

                                              P Value
Sl. No.      PPV      NPV     Accuracy      by Spearman

                                            Correlation
   1         50%     97.92%     94%      < 0.001 Significant
   2        100%      80%       94%      < 0.001 Significant
   3         --      100%      100%              --
   4         --      100%      100%              --
   5        66.67%   97.87%     96%      < 0.001 Significant
   6        100%     36.67%     62%      0.012 Significant
   7         70%     47.50%     52%      0.119 Non-Significant

                  Kappa
Sl. No.        Coefficient

            Values and Agreement
   1            0.315 Fair
   2        0.848 Almost Perfect
   3                --
   4                --
   5        0.645 Substantial
   6            0.317 Fair
   7           0.104 Slight

Table 11. Comparison of Kappa Values

                                Our Study

    Findings         TP     FP    FN    TN       Kappa Value

Partial Thickness    20     0     5     25    0.800 Substantial
 Full Thickness       7     2     0     4     0.852 Almost Perfect

                           Bashir Shahnawaz et al

    Findings         TP     FP    FN    TN       Kappa Value

Partial Thickness    12     2     4     12          0.818
 Full Thickness      20     0     2     12
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Title Annotation:Original Research Article; magnetic resonance imaging
Author:Narra, Ramakrishna; Jehendren, Varunya Mary; Bollipo, Johny Prasad; Putcha, Anusha
Publication:Journal of Evolution of Medical and Dental Sciences
Article Type:Report
Date:May 8, 2017
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