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Incidence of Pars Defects in Adolescent Idiopathic Scoliosis: an MRI Study

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Incidence of Pars Defects in Adolescent Idiopathic Scoliosis: an MRI Study ACTA ORIGINAL ARTICLE ORTHOPAEDICA et TRAUMATOLOGICA Acta Orthop Traumatol Turc 2011;45(4):209-214 TURCICA doi:10.3944/AOTT.2011.2555 Incidence of pars defects in adolescent idiopathic scoliosis: an MRI study Sudiptamohan MUKHOPADHYAY1, Sameer BATRA1, Sridhar KAMATH2, Kaushik MUKHERJEE2, Sashin AHUJA1 1Cardiff Spinal Unit, University Hospital of Wales, Cardiff, UK; 2Department of Radiology, University Hospital of Wales, Cardiff, UK Objective: In this study, our aim was to present the incidence rate of pars defect in patients with adolescent idiopathic scoliosis, based on MRI findings. Methods: Two-hundred twenty adolescent idiopathic scoliosis (AIS) patients with MRI scans, taken either as a preoperative investigation or due to other symptoms between 2006 and 2008, were included in the study. The scans were reviewed for pars defect independently by two expe- rienced musculoskeletal radiology consultants. Results: Among the 220 patients, 9 patients (4.09%; 8 female, 1 male) were found to have a pars defect. The mean age of the affected patients was 14 (range: 11-20) years. We noted two lumbar/thoracolumbar curves (Lenke 5), four King Type 1, one King Type 2 and two King Type 3 curves. All scoliotic deformities were non-structural. Bilateral pars defect was noted in eight (89%) of these patients. All of the pars defects were at the L5 vertebral level. Conclusion: Our study revealed a 4.09% incidence rate of pars defect in AIS patients which appeared similar to those previously reported in roentgenographic studies. Key words: Adolescent idiopathic scoliosis; incidence; MRI; pars defect. The incidence rate of pars defect associated with idio- The reported incidence of spondylolysis is pathic scoliosis in previous studies has been reported around 5% (range: 1.1-6.4%) in cadaveric speci- as 6%, based on roentgenographic evaluations.[1] The mens.[13,14] Previous radiographic studies have also impact of pars defect in the management of scoliosis shown a 7.2% incidence rate of pars defect.[15,16] has also been described extensively.[2-8] The majority Early detection of associated pars defects and dif- of studies were based on roentgenograms, such as the ferentiation from other associated lesions is crucial. oblique view at the lumbosacral junction. MRI is Previous studies have shown that MRI can identify reportedly superior in the visualisation and classifica- pars defects early in young athletes. However, no tion of various types of pars defects and morpholo- previous study on the use of MRI in the identifica- gy.[8-12] Commonly used MRI protocols, such as sagit- tion of spondylolysis in idiopathic scoliosis patients tal T1-W and T2-W fast spin echo (FSE), have been has been published. The aim of the present study was found to be useful in differentiating types of spondy- to define the incidence rate of pars defect in idio- lolysis in recent studies.[10] pathic scoliosis using MRI. Correspondence: Sudiptamohan Mukhopadhyay; MS (Orth.), MRCS. 4, Woolmer Close, Cardiff, South Glamorgan, CF5 2QY, UK. Tel: +44 782 - 865 24 04 e-mail: [email protected] Submitted: October 10, 2010 Accepted: May 4, 2011 ©2011 Turkish Association of Orthopaedics and Traumatology 210 Acta Orthop Traumatol Turc Patients and methods Table 1. Classification of pars interarticularis based on MRI apperaence. We reviewed the MRI scans of 220 patients with ado- lescent idiopathic scoliosis (AIS) taken either as a pre- Grade Type MRI features operative investigation or due to other symptoms 0 Normal Normal marrow signal, intact between 2006 and 2008. Patients with congenital cortical margin. spinal anomalies were excluded. Only patients twenty 1 Stress reaction Marrow edema, intact cortical years of age or younger were included in the study. margins. Scoliotic and lordotic curves were measured using 2 Incomplete fracture Marrow edema, cortical fracture Cobb’s method in patients with a pars defect. incompletely extending through pars. A total of 88.9% (n=8) patients with defects were 3 Complete active fracture Marrow edema, cortical fracture female and one patient was male. Eighty-eight percent completely extending through of patients were Caucasian, while one patient was pars. Asian. Sixty-six percent (n=6) of patients were 4 Fracture non-union No marrow edema, fracture scanned for back symptoms and the remainder (n=3) completely extending through were scanned preoperatively to rule out any associat- pars. ed cord anomalies. Three patients received corrective spinal surgery with anterior release and instrumenta- tion. None of them had instrumentation across the pars ant musculoskeletal radiologists on the presence of defect. Hence, no problem was experienced during pars defects was statistically significant (p<0.05). identifying pars defect due to presence of metalwork. Sagittal images were particularly useful in identi- Case notes were reviewed to document symptoms and fying pars signal changes. One case of a single clinical outcomes at the latest follow-up. hypointense line across the pars defect was also included. However, all cases had hypointense signals Sagittal MRI scans were reviewed by two experi- which suggested that they had reached the terminal enced musculoskeletal radiologists using a high-reso- stage. Still, no significant change was noted in the lution monitor with a 1.5T magnetic resonance system adjacent lamina where adaptive changes due to (Philips Medical Systems, Best, the Netherlands). For increased weight-bearing were expected. Clearly, proper visualization, a minimum of 3 mm of interslice such findings were expected in AIS with the pars thickness and sagittal and axial images with STIR/fat- defect at a stage when they were not scanned with suppressed images were required. The presence of MRI. Over time, early changes in the pars progressed pars defect was determined using the available classi- to a stage where healing was no longer possible. fication system (Table 1). Routine MRI acquisition Upon further follow-up, two patients required surgi- protocols included TR (461 ms), TE (24 ms), slice cal intervention for pars defects. One developed pro- thickness (3 mm), interslice gap (0.625 mm), and a gressive spondylolisthesis requiring fusion. Another field of view (320 mm).[8] Statistical analysis was patient developed disc degenerative changes and made using the independent Student’s t-test. underwent discography. Results At the final follow-up, three patients complained Among the 220 patients, 9 (4.09%; 8 female, 1 male; of long-term back pain. One of these required thoracic mean age: 14 years; range: 11-20 years) were found fusion due to persistent thoracic pain. The remainder to have a pars defect (Fig. 1). We noted a varying were satisfied with their activity level. severity of curve patterns; two lumbar/thoraco-lum- In most cases, patients with more severe scoliosis bar curves (Lenke 5), four King Type 1, one King had a greater degree of lordosis (Fig. 2). However, a Type 2 and two King Type 3 curves (Table 2).[17] All one-tailed Student’s t-test was not found to be statisti- scoliotic deformities were non-structural and were at cally significant (p=0.09). the terminal stages (Hollenberg Grade 4). Bilateral pars defect was noted in eight (89%) of these Discussion patients. All pars defects were at the L5 vertebral Previous studies have described the incidence rate of level. Inter-observer agreement between two consult- pars defect associated with idiopathic scoliosis as Mukhopadhyay et al. Incidence of pars defects in scoliosis 211 Fig. 1. Arrows pointing towards hypointense pars defects on sagittal images. approximately 6.2%.[1,13] The association between geries is also well recognised.[20] Thirty-two percent scoliosis and pars defect necessitates the monitoring of patients with AIS have pain and 9% of those have of both conditions in the presence of one at the lum- underlying pathologies.[21] The presence of a pars [1,3,13,18] bar or thoracolumbar region. However, while defect may cause a progressive compensatory scoli- classifying AIS, King et al. excluded the lumbar and otic deformity in early adulthood, which runs the thoracolumbar curves along with congenital and risk of becoming structural in the future.[7] The index neuromuscular scoliosis in their series of 405 study done by Fisk et al. among 500 patients who patients.[19] It has been reported that a pars defect at needed hospital admission included only adoles- the L4 region has an increased likelihood of healing cents.[1] In previous studies emphasizing early diag- than that at the L5-S1 region. Previous studies have nosis of pars defect using MRI, only patients below concluded that the likely explanation for this is the [22] greater load on axial compression in the L5-S1 19 years of age were included. Operation or con- region and increase as the lumbar lordosis increas- servative management with bracing has also been [4] es.[7] Movement at the pars, associated degenerative shown to lead to healing of the pars defect. A lesions, and reaction to the adjacent area all affect recent study suggested that pediatric spondylolisthe- healing of the pars defect following conservative sis actually occurs through open physis and the early management in a brace.[4] The effect of a pars defect identification of pars defect is therefore important to on the postoperative outcome of lumbar fusion sur- prevent such deformity.[23] 212 Acta Orthop Traumatol Turc Table 2. Clinical and radiological details of patients with pars interarticularis defect identified on MRI. Cases Sex,
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