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ORIGINAL ARTICLE
Acta Orthop Traumatol Turc 2012;46(5):346-352 Efficacy of sonographically guided
intra-flexoral sheath corticosteroid injection
in the treatment of trigger thumb
Mohsen MARDANI-KIVI1, Farivar Abdullahzadeh LAHIJI2, Ali Babaei JANDAGHI3,
Khashayar SAHEB-EKHTIARI4, Keyvan HASHEMI-MOTLAGH4
1Department of Orthopedics, Guilan University of Medical Sciences, Rasht, Iran; 2Department of Orthopedics, Shahid Beheshti University of Medical Sciences, Tehran, Iran; 3Department of Radiology, Guilan University of Medical Sciences, Rasht, Iran; 4Orthopedics Research Center, Guilan University of Medical Sciences, Rasht, Iran Objective: The aim of this study was to determine the efficacy of sonographically guided intra-flexo-
ral sheath corticosteroid injection in the treatment of trigger thumb.
Methods: This study included 112 trigger thumbs of 104 patients (7 males, 97 females; mean age:
52.11 years) studied prospectively from 2009 to 2011. All patients experienced pain, tenderness, dis-
comfort and/or triggering with flexion/extension of the thumb and palpable nodules at the level of the
A1 pulley. Ultrasonographically guided corticosteroid injection was performed on all affected thumbs.
Thumb improvement was evaluated using the Quinnell grading system and patients were followed up
for one year.
Results: All 112 thumbs received one ultrasonographically guided corticosteroid injection. Fifteen
thumbs (13.4%) needed re-injection and/or surgery during their one year follow-up. Eight (53.3%) of
these 15 cases, had a pre-treatment Quinnell Grade of 4, six (40%) thumbs were Grade 3 and one
(6.7%) was Grade 2. Twelve were re-injected, two underwent surgery without re-injection and one
underwent surgery after showing no improvement following re-injection. There was a significant
reduction in the post-injection Quinnell grade (p<0.0001). One year after the initial injection, 108
thumbs (96.4%) were completely symptom-free.
Conclusion: Sonographically guided intra-flexoral sheath corticosteroid injection is an effective
method in the treatment of trigger thumb and reduces the need for surgery.
Key words: Corticosteroid injection; tenosynovitis; therapeutic; trigger thumb; ultrasound.
Trigger finger/thumb is one of the most prevalent rigidity, a click, difficulty in opening the flexed finger causes of hand disability and is a common cause of and pain caused by inflammation and progressive referral to orthopedic clinics.[1-3] It is more common hypertrophy of the finger or thumb flexor tendon among women,[1,3-6] with the thumb having the highest sheath at the level of the A1 pulley.[8-13] The first line of involvement.[1,6,7] Symptoms include snapping, locking, treatment are conservative methods, such as finger Correspondence: Mohsen Mardani-Kivi, MD. Guilan University of Medical Sciences,
Namjoo Avenue, Rasht, Iran, PO Box: 4193713191.
Tel: +98-131 - 323 98 42 e-mail: dr_mohsen_mardani@yahoo.com Submitted: December 3, 2011 Accepted: April 4, 2012
2012 Turkish Association of Orthopaedics and Traumatology Mardani-Kivi et al. Efficacy of ultrasound-guided intra-flexoral sheath corticosteroid injection in trigger thumb rests with or without the use of a splint and a local cor- ease, carpal tunnel syndrome and Dupuytren’s con- ticosteroid injection.[1,14-16] Surgical treatments are inva- tracture, involvement of other fingers, clinical doubt as sive and have potential complications. Although good to the true nature of the symptoms or any history of results with surgical treatment are possible in children local corticosteroid injection were excluded.
over one year of age,[17] surgery is only indicated if non- Additionally, patients undergoing ultrasound-guided surgical treatments fails in adults.[7,14,18] intra-flexoral sheath injection treatment in the first Intra-flexoral corticosteroid injection is the most three months were excluded. One hundred and twelve common non-surgical treatment with a reported suc- thumbs of 104 patients (7 men, 97 women; mean age: cess rate between 38 and 93% for the treatment of trig- 52.11±7.63 years; range: 26 to 69 years) were included ger thumb.[1,6,19,20] Recently, studies have questioned the accuracy and precision of intra-sheath blind corticos- The affected side was right in 64 patients, left in 32 teroid injection and its effect on the treatment success and bilateral in 8. Trigger thumb was seen in the dom- rate.[1] A recent study explored the intra-sheath delivery inant hand in 89 of 112 thumbs (79.5%) and in the of corticosteroids using a blind injection of methylene non-dominant hand in 23 (20.5%). Patients were grad- blue and corticosteroid into the sheath before open ed according to Quinnell’s grading classification surgery in the treatment of trigger thumb. They (Table 1). Of the 104 patients, 28 (26.9%) had con- observed that the contrast medium was successfully comitant medical conditions (Table 2). Symptoms injected into the flexoral sheath in only half of the were present for less than six months (<6 months blind injections and was clinically manifested as an group) in 107 thumbs (95.5%) and more than 6 increase in the duration of symptoms in this sub-group months (>6 month group) in 5 thumbs (4.5%). of patients.[21] In addition, reports have been issuedabout hazardous consequences of blind injection ofcorticosteroids.[22,23] Lee et al. performed a study com- paring 20 ultrasound-guided injections and 20 blindinjections and reported successful intra-sheath injec- Grade Explanation
tion in 70% of the group with ultrasound-guided injec- Without trigger state, uneven finger movement or slight tions and only in 15% in the group receiving blind injections.[24] Therefore, the aim of this study was to Trigger state, finger snapping that is corrected actively study the therapeutic outcomes and complications of Trigger state, finger snapping that is corrected passively ultrasound-guided intra-flexoral sheath injection. Patients and methods
This descriptive, prospective study reviewed all
Previous studies have showed increased success rates patients referred to our orthopedic clinic for trigger with the insertion of a 25-gauge needle in a proximal to thumb between March 2009 and March 2011.
distal direction at an angle of 30-45° angle from the volar Inclusion criteria were pain and tenderness at the posi- side into the anatomic position of the A1 pulley.[4,21,25] We tion of A1 pulley, pain and discomfort when flexing performed the same procedure using 1 ml of 40 mg/ml and extending the finger, nodule palpation, presence of methyl prednisolone acetate and 0.5 ml of 2% lidocaine a clicking sound at the time of flexion or extension of hydrochloride in all patients. All examinations, diagno- the thumb, snapping or locking of finger, and the exis- sis, injections, investigation of therapeutic outcomes and tence of a trigger state. Patients with any kind of con- re-injections or operations, if needed, were performed comitant local tenosynovitis such as De Quervain’s dis- by the corresponding author. Ultrasound guidance was The frequency of concomitant medical conditions in the population of the patients of this study.
Frequency in persons
synchronous
Number of
having concomitant
Frequency in
patients*
medical conditions
all patients
*One patient was simultaneously afflicted with diabetes mellitus and rheumatoid arthritis and one patient had diabetes mellitus andhypothyroid simultaneously.
Setting the probe to find the tendon in axial view. [Color Rotating the probe to find the tendon in longitudinal view.
figure can be viewed in the online issue, which is available [Color figure can be viewed in the online issue, which is performed using a 14 MHz linear probe (Ultrasonix, needle was inserted into the space between the A1 pul- Touch model, ver. 5.5.4). First, the tendon was detect- ley and flexor pollicis longus at a 30 to 45° angle ori- ed through an axial scan of the proximal phalanx (Fig.
ented proximal to distal and the solution injected (Fig.
2) and the probe was rotated until a fibrillary echo pat- 4). Distension of the tendon sheath and the resultant tern was visualized and adjusted in the screen center.
fluid wave inside from the finger tip to the injection Next, the probe was moved proximally to the first MCP site were confirmed during the injection process (Figs.
joint and the first annular pulley appeared (Fig. 3). The Inserting the needle at 30-45° angle.
Longitudinal view of needle's entrance (Hollow arrows: [Color figure can be viewed in the online issue, which is needle, solid arrows: tendon, star: the first metacarpopha- Longitudinal view of tendon after corticosteroid injection Axial view of the tendon after corticosteroid injection (Arrows: confluence of liquid inside sheath around tendon, (Arrows: fluid collection inside sheath around tendon).
star: the first metacarpophalangeal joint). Mardani-Kivi et al. Efficacy of ultrasound-guided intra-flexoral sheath corticosteroid injection in trigger thumb Frequency
Patients were followed-up at 3 and 6 weeks, 3 and 6 ences of qualitative parameters between groups. To months and 1 year after the first injection. Of the orig- analyze the trend of Quinnell’s grade changes, repeat- inal 117 patients, 13 were excluded from the study ed measure analysis test through Mauchley’s test of because of failed follow-up. The Quinnell’s criterion sphericity was employed, and to evaluate the value of was applied to evaluate improvements during follow- these changes, analysis of variance (ANOVA) was per- up. Patients were observed for 6 weeks and further formed. In all statistical tests, the p value was set at treatment (re-injection or surgery) was suggested to patients and performed depending on patient prefer-ence. In addition, patients who were still symptomatic after 2 injections became candidates for open surgery.
Symptoms were completely ameliorated after one Collected data was saved separately into two thera- injection in 86.6% of thumbs. These patients had no peutic groups and was statistically analyzed using SPSS relapse. At the one year follow-up, 15 thumbs (13.4%) software package for Windows v.19.0 (SPSS Inc., needed reinjection and/or surgery. Of these 15 Chicago, IL, USA). After summarizing the characteris- thumbs, 12 (80%) were re-injected, 2 (13.3%) under- tics of both groups with descriptive statistics, response went surgery without re-injection, and one (6.7%) was variables were evaluated according to the re-injected and underwent subsequent surgery. No Kolmogorov-Smirnov test and it was shown that none thumb was injected more than two times. Of the 13 had a normal distribution. The Mann-Whitney U test reinjection cases, only one case (7.7%) needed surgery.
was used in order to compare these variables of both After one year (6th visit), 109 thumbs (97.3%) were groups and the chi-squared test to compare the differ- symptom-free and only one thumb was at Quinnell’s Frequency distribution and the mean of Quinnell's grade of fingers in performed visits.
Mean±SD
Turn of visit
Number (%)
Number (%)
Number (%)
Number (%)
Number (%)
Quinnell’s grade (Mean)
Quinnell’s grade (Mean)
Quinnell's grade in two groups of less and more than 6months.
Grade 1. Due to this patient’s unwillingness, reinjec- of sonographic guidance. The inaccuracy associated with blind injection appears to be responsible for the Quinnell’s grading for thumbs from the first to decrease in success rates seen in intra-sheath delivery sixth visits is shown in Table 3. Statistical analysis revealed that the trend and value of variations of The relationship between the existence of one or Quinnell’s grade are statistically significant for all more concomitant medical conditions and the efficacy thumbs (p<0.0001) (Fig. 8). In addition, trend and of corticosteroid injection has also been scruti- value of variations of Quinnell’s grade was statistically nized.[6,14,19,27-29] Many authors, including Blythe and Ross, significant between the over and under 6 month symp- regarded trigger thumb as a part of what they called tom groups (p<0.0001) (Fig. 9). There was no signifi- “diabetic hand syndrome”.[28] Since there were a limited cant difference in trend and value of variations of the number of patients with both hypothyroidism (6.7%) Quinnell’s grade between diabetic and non-diabetic and rheumatoid arthritis (2.9%) in this study, we chose patients (p=0.85 and p=0.63, respectively). Quinnell’sgrades of these two groups are given in Fig. 10.
Complications were not seen in any patient. Discussion
The effect of corticosteroid injections in the treatmentof stenosing tenosynovitis is a contentious issue in orthopedics. Despite studies for more than a quartercentury, the role of corticosteroid injections into the flexor tendon’s sheath and the importance of intra-sheath delivery in the treatment of trigger finger and thumb has been questioned.[1,19,21,26] In the present study, Quinnell’s grade (Mean)
109 of 112 thumbs (97.3%) were completely symptom- free one year post-injection. This rate is higher than the reported success rates of 38 to 93% in previousstudies.[1,16,19,20] Those studies with a varying range of success rates relied on blind injection for the corticos- teroid delivery, while those with higher success rates, Fig. 10. Quinnell's grade in two groups of diabetic and non-diabet-
including the present study, were attained with the aid Mardani-Kivi et al. Efficacy of ultrasound-guided intra-flexoral sheath corticosteroid injection in trigger thumb to discuss diabetic patients, as it is very common in our 3. Flatt AE. Notta’s nodules and trigger digits. Proc (Bayl Univ patient population. In several previous studies,[2,19,29] dia- betic patients showed less therapeutic response than 4. Creighton JJ Jr, Idler RS, Strickland JW. Trigger finger and non-diabetic individuals and required surgical treatment 5. Ger E, Kupcha P, Ger D. The management of trigger more often. In a study of 54 diabetic patients with 121 thumb in children. J Hand Surg Am 1991;16:944-7.
trigger thumbs over a 3 year follow-up, Griggs et al.[27] 6. Moore JS. Flexor tendon entrapment of the digits (trigger reported that symptoms were completely ameliorated in finger and trigger thumb). J Occup Environ Med 2000;42: 34 fingers (28%) after the first injection, and this num- ber increased by an additional 27 fingers (22%) after the 7. Lange-Riess D, Schuh R, Hönle W, Schuh A. Long-term second and third injections. Sixty fingers (50%) results of surgical release of trigger finger and trigger thumb improved slightly and required surgery to release the A1 in adults. Arch Orthop Trauma Surg 2009;129:1617-9.
pulley. In the present study, although a higher percent- 8. Newport ML, Lane LB, Stuchin SA. Treatment of trigger age of diabetic thumbs opposed to non-diabetic thumbs finger by steroid injection. J Hand Surg Am 1990;15:748-50.
(30.8% and 18.2%, respectively) required reinjection, 9. Sampson SP, Badalamente MA, Hurst LC, Seidman J.
Pathobiology of the human A1 pulley in trigger finger. J Hand this difference was not statistically significant (p=0.28).
This indicates that diabetic patients benefit from ultra- 10. Doyle JR. Anatomy of the finger flexor tendon sheath and sound-guided intra-flexoral injection as much as non- pulley system: a current review. J Hand Surg Am 1989;14: Limitations of sonographically guided intra-flexo- 11. Hume EL, Hutchinson DT, Jaeger SA, Hunter JM.
ral injection are the limited availability of sonography Biomechanics of pulley reconstruction. J Hand Surg Am1991;16:722-30.
and the need for skillful radiologists for ultrasound 12. Moutet F. Flexor tendon pulley system: anatomy, pathology, guidance, which cause significantly more costs com- treatment. [Article in French] Chir Main 2003;22:1-12. pared to the blind method. However, the reduction in 13. Bayat A, Shaaban H, Giakas G, Lees VC. The pulley system the need for surgery and the remarkable increase in the of the thumb: anatomic and biomechanical study. J Hand speed and rate of symptom amelioration results in a reduction in health care costs and the financial burden 14. Makkouk AH, Oetgen ME, Swigart CR, Dodds SD. Trigger finger: etiology, evaluation, and treatment. Curr Rev Muscu- This study was conducted on the thumb only. With 15. Colbourn J, Heath N, Manary S, Pacifico D. Effectiveness of the exception of a limited number of case studies,[2] splinting for the treatment of trigger finger. J Hand Ther most studies have been conducted on trigger fingers (thumbs and fingers) and the fact that this study is lim- 16. Maneerit J, Sriworakun C, Budhraja N, Nagavajara PN.
ited to the thumb makes it difficult to compare and Trigger thumb: results of a prospective randomised study of generalize its results to other fingers. On the other percutaneous release with steroid injection versus steroid hand, the present study included a large sample volume injection alone. J Hand Surg Br 2003;28:586-9.
of thumbs that is rare. Further studies that consider the 17. Sevencan A, Inan U, Köse N, Omero¤lu H, Seber S.
efficacy of the same method in other fingers with a Percutaneous release for trigger thumb in children: improve-ments of the technique and results of 31 thumbs. J Pediatr larger volume of samples are recommended.
In conclusion, sonographically guided corticos- 18. Cebesoy O, Kose KC, Baltaci ET, Isik M. Percutaneous teroid injection into the sheath of the flexor tendon of release of the trigger thumb: is it safe, cheap and effective? the thumb appears to be a highly useful in the treat- ment of trigger thumb and decreases the need for sur- 19. Nimigan AS, Ross DC, Gan BS. Steroid injections in the gery, especially in patients who with a symptom dura- management of trigger fingers. Am J Phys Med Rehabil 20. Lambert M, Morton RJ, Sloan JP. Controlled study of the Conflicts of Interest: No conflicts declared.
use of local steroid injection in the treatment of trigger fin-ger and thumb. J Hand Surg Br 1992;17:69-70.
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