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PubMed1985

The surgical treatment of congenital kyphosis. A review of 94 patients age 5 years or older, with 2 years or more follow-up in 77 patients.

Ninety-four patients with surgical treatment of congenital kyphosis have been reviewed. Of these, 77 had a follow-up of 2 years or more, with an average follow-up of 7 years. The average age at surgery was 15, and the average kyphosis was 75 degrees. Twenty-seven had posterior fusion only, and 48 had combined anterior and posterior fusion. (Two others had anterior fusion only). The average kyphosis in the two groups was the same, but the anterior and posterior group had a better correction and a better maintenance of correction than the posterior group alone. Kyphosis of less than 55 degrees in growing children often was stabilized successfully by posterior surgery only, but adults and patients with kyphosis greater than 55 degrees required both anterior and posterior fusion. Halo-femoral traction was responsible for two of the three paralyses in this review.

Adolescent↗
PubMed1994

Angular kyphosis as an indicator of the prevalence of Pott's disease in Transkei.

To understand better the prevalence, distribution and major causes of sagittal spinal deformity in a rural homeland, the authors conducted a study of angular kyphosis in the spines of 2,329 Transkei patients. Thirty-one (1.33%) had angular kyphosis. Lateral chest radiographs were obtained from 22 of these patients. Radiographic kyphotic angles ranged from 28 degrees to 130 degrees (mean: 70.3 +/- 7.6). The vast majority (81%) demonstrated classical clinical and/or radiographic findings of tuberculous aetiology. Less frequent aetiologies included fractures (2), osteoporosis (1), congenital malformation (1) and kyphosis of unknown origin (2). Eleven of the kyphotic patients were seeking care for unrelated problems and were asymptomatic in respect of their kyphoses. As a subset, the asymptomatic individuals demonstrated a similar aetiological distribution, with 73% strongly suggestive of tuberculous aetiology. The prevalence of asymptomatic angular kyphosis in this unselected Transkei patient population was 0.47% +/- 0.14%. In this hospital-based study, angular kyphosis proved a valuable marker for spinal tuberculosis. Because tuberculous spondylitis is more successfully treated when detected early, spinal palpation should be included in the routine physical examination of patients or populations at risk for tuberculosis.

Adolescent↗
PubMedDate not supplied

Do anterior interbody cages have a potential value in comparison to autogenous rib graft in the surgical management of Scheuermann's kyphosis?

BACKGROUND CONTEXT: Previous studies have analyzed the outcome following posterior correction and combined anterior-posterior correction for Scheuermann's kyphosis. Traditionally interbody fusion has been obtained using morselized rib graft. Recently the use of titanium anterior cages has been suggested for interbody use. There are no long-term studies comparing these two techniques. PURPOSE: To investigate the potential value of titanium anterior interbody cages compared with morselized rib graft for anterior interbody fusion in combination with posterior instrumentation, correction, and fusion for Scheuermann's kyphosis. STUDY DESIGN: Nonrandomized comparison of two surgical techniques in matched subjects. PATIENT SAMPLE: Fifteen patients with identical preoperative radiographic and physical variables (age, gender, height, weight, body mass index) were managed with combined anterior release, interbody fusion, posterior instrumentation, correction, and fusion. Group A (n=8) had morselized rib graft inserted into each intervertebral disc space. Group B (n=7) had titanium interbody cages packed with bone graft inserted at each level. The posterior instrumentation extended from T2 to L2 in both groups. OUTCOME MEASURES: Preoperative and postoperative curve morphometry was studied on plain radiographs by two independent observers. The indices studied included Cobb angle, Ferguson's angle, Voutsinas index, sagittal vertical axis (SVA), sacral inclination (SI), and lumbar lordosis (LL). Interbody fusion was assessed at final follow-up. Each patient was reviewed at 3, 6, 12, 24, 48, and 60 months after surgery with standing radiographs. METHODS: Both surgical groups were compared in terms of radiological parameters and complications. Wilcoxon-matched pairs test and Mann-Whitney test were used. RESULTS: The average follow-up for Group A was 70 months and for Group B 66 months. For the whole group, the preoperative median Cobb angle for thoracic kyphosis was 86 degrees , the median Ferguson angle was 50 degrees , Voutsinas index was 28.7, SVA -3.5 centimeters, lumbar lordosis was 66 degrees , and the median sacral inclination angle was 40 degrees . The median postoperative Cobb angle was 42 degrees , Ferguson angle 28.4 degrees , Voutsinas index 13, SVA -4.0 centimeters, and the median sacral inclination angle was 34 degrees . There were significant differences between preoperative and postoperative measurements for all variables (p<.01), indicating that good correction was achieved. At 4-year follow-up, fusion criteria were satisfied in 12 of 15 cases (80%). Three patients had distal junctional kyphosis. There was no significant difference obtained in the final Cobb angle, Ferguson angle, and Voutsinas index when Group A (rib graft) was compared with Group B (titanium cage) Both Group A and B patients retained the postoperative correction achieved with respect to all the radiographic parameters studied. CONCLUSION: We were unable to demonstrate any significant advantage for the use of anterior titanium interbody cages over the use of morselized rib graft in the surgical management of Scheuermann's kyphosis. Given the not inconsiderable cost and the need for posterior chevron osteotomies when interbody cages are used, we have now reverted to our previous practice of using morselized rib graft at each intervertebral level.

Adult↗
PubMed2001

How do anterior/posterior translations of the thoracic cage affect the sagittal lumbar spine, pelvic tilt, and thoracic kyphosis?

Anterior and posterior thoracic cage translations in the sagittal plane have not been reported for their range of motion and effects on the lumbar spine and pelvis. Twenty subjects volunteered for full-spine radiography in neutral, anterior, and posterior thoracic cage translation postures in a standing position. While grasping an anterior vertical pole, with hands at elbow level, subjects were instructed on how to translate their thoracic cage without any flexion/extension, utilizing a full-length mirror. On the radiographs, all four vertebral body corners of T1 through S1 and the superior margin of the acetabulum were digitized. Segmental and global angles of thoracic kyphosis, sagittal lumbar curvature, and pelvic flexion/extension in translation postures were compared to alignment in the neutral posture. Using the femur heads as an origin, the mean range of thoracic cage translation, measured as horizontal movement of T12 from neutral posture, was found to be 85.1 mm anterior and 73 mm posterior. In anterior translation, the thoracic kyphosis is hypokyphotic (Cobb T1-T12 reduced by 16 degrees). In posterior translation, the segmental angles at T12-L1 and L1-L2 flexed, creating an "S" shape in the sagittal lumbar spine, while the thoracic kyphosis increased by 10 degrees. Using posterior tangents from L1 to L5 and T12 to S1, and Cobb angles at T12-S1, the lumbar curve reduced slightly (by less than 3.3 degrees for all global angle measurements) in anterior translation and reduced by 7.4 degrees, 5.7 degrees, and 8.1 degrees respectively in posterior thoracic translation. The angle of pelvic tilt (measured as the angle of intersection of a line through posterior-inferior S1 to the superior acetabulum and the horizontal) reduced by a mean of 15.9 degrees, and Ferguson's sacral base angle to horizontal reduced by a mean of 13.1 degrees in posterior translation. In anterior translation, pelvic tilt and Ferguson's sacral base angle increased by 15.1 degrees and 12.8 degrees, respectively. The findings of this study show that thoracic cage anterior/posterior translations cause significant changes in thoracic kyphosis (26 degrees ), lumbar curve, and pelvic tilt. An understanding of this main motion and consequent coupled movements might aid the understanding of spinal injury kinematics and spinal displacement analysis on full spine lateral radiographs of low back pain and spinal disorder populations.

Adult↗
PubMed2002

Three-stage surgery in the management of severe rigid angular kyphosis.

There are conflicting data regarding the management of rigid kyphosis. None of the currently known techniques can completely correct severe kyphosis without resulting in residual deformity. Seven patients with local kyphosis exceeding 60 degrees were operated on to achieve complete correction of the deformity. The surgery consisted of total spondylectomy of the deformed vertebra and simultaneous application of compression-distraction forces to this area. The operation included three stages: The initial stage includes resection of posterior spinal elements and temporary fixation. In the second stage, an anterior corpectomy is performed to conclude the resection, and simultaneous antero-posterior correction is obtained. The final stage includes another posterior procedure to achieve a precise correction and to correct any compensatory curves. All patients were operated on using this technique in a single session. The mean preoperative and postoperative kyphosis angles were 76.1 degrees (range, 65 degrees -92 degrees) and 6 degrees (range, 0 degrees -13 degrees), respectively. Complete bony fusion was achieved after a mean follow-up period of 38 months (range, 26-52 months) without any neurological sequelae or significant loss of correction.

Adolescent↗
PubMed2002

Combination of lumbar kyphosis, epidural lipomatosis, and perineural cyst as a cause of neurological deficit: a case report.

We describe the rare simultaneous occurrence of epidural lipomatosis and a perineural cyst at the same level, lumbar kyphosis, osteoporotic vertebral fractures, and neurological deficits. A 75-year-old corticosteroid-dependent female farmer presented with severe low back pain, progressive lumbar kyphosis, and inability to stand because of numbness and muscle weakness of both legs. Plain radiographs displayed markedly decreased bone density, significant lumbar kyphosis, and vertebral compression fractures of L2, L3, and L4. Magnetic resonance imaging of the lumbar spine revealed a perineural cyst at the L2-3 level, extensive epidural lipomatosis, and spinal canal stenosis. Laminectomy from L3 to L5 with resection of epidural fatty tissue restored her walking ability. We postulate that the osteoporotic fractures and epidural lipomatosis were induced by corticosteroid therapy. Preexisting degenerative lumbar kyphosis of the type commonly seen in elderly farmers could have promoted osteoporotic lumbar vertebral fractures at points where bending stress had been strongly exerted. The combination of a perineural cyst and epidural lipomatosis at the same level has not been reported previously.

Aged↗
PubMed1994

Behavioral treatment of scoliosis and kyphosis.

A behavioral treatment of scoliosis and kyphosis was tested with 27 adolescent patients (19 scoliosis, eight kyphosis patients) to determine in which cases the conspicuous and restraining brace treatment could be replaced. In 22 compliant patients, posture biofeedback (PB) was highly effective compared to five non-compliant patients. Biologically more mature scoliosis patients (menarche at the beginning of treatment) seemed to profit more from PB. With kyphosis patients the PB treatment resulted in rapid straightening of the spine and removal of structural deformities of Scheuermann's disease. PB may serve as an unobtrusive yet effective treatment alternative for both juvenile scoliosis and kyphosis.

Adolescent↗
PubMedDate not supplied

[Epidemiology of kyphosis in school children].

At five schools in the city of Bochum a serial study was carried out with regard to pathological posture of the spine. In total 2075 pupils from 10 to 17 years of age were examined and the degree of kyphosis was determined using Debrunner's kyphometer. An angle of 40 degrees or more was supposed to be a pathological kyphosis. The rate of this kyphosis was 12 p.c. in girls and 15.3 in boys. The children with pathological curvature were compared with a group of children inconspicuous with regard to posture and selected by random. The two groups were questioned using a halfstandardized questionnaire. This was designed to obtain details of general circumstances of life, attitude in sports and medical history either in orthopedics and diseases in the family. Thereby was seen that children with pathological kyphosis practised less sports and had more orthopedic diseases, and also in their families more orthopedic problems and back pain occurred.

Child↗
PubMed2004

Surgical correction of kyphosis: posterior total wedge resection osteotomy in 32 patients.

BACKGROUND: Many surgical procedures have been developed for the treatment of kyphoscoliosis. We present our experience of one technique for posterior total wedge resection osteotomy, with clinical and radiographic results. This is a one-stage solution which results in a shortened posterior column and reduced tension on the spinal cord in rigid angular kyphosis. PATIENTS AND METHODS: Between 1990 and 2000, we treated 32 patients with rigid local kyphosis by posterior wedge osteotomy and instrumentation. The etiology was congenital malformation in 17 cases, infection in 11 and previous laminectomy in 4 cases. The osteotomy is performed at the apex of the kyphotic deformity and covers two vertebrae. The upper and lower borders of the osteotomy are right inferior to the transverse processes of the upper and lower vertebrae respectively. The apex of the posteriorly based triangular osteotomy is either at the anterior vertebral body or anterior longitudinal ligament. RESULTS: The mean preoperative angle of local kyphosis was 72 (25-112) degrees mainly at the thoracolumbar region, and it improved to a mean of 23 (0-48) degrees after an average follow-up of 57 (24-108) months. The mean preoperative sagittal plumbline imbalance of 5.5 (2-12) cm was improved to 1.2 (-2-3.5) cm postoperatively. The mean loss of correction since operation was 3.4 (0-11) degrees. Radiographically, solid anterior and posterior fusion was achieved in all patients by 6 months. 1 patient had irreversible paraplegia and 2 others had transient nerve root injury postoperatively. INTERPRETATION: Posterior total wedge resection osteotomy eliminates the need for anterior procedure and does not cause tractional force on the spinal cord, since the posterior column is shortened. This is an effective one-stage procedure, especially for the treatment of sharp and rigid kyphosis.

Adolescent↗
PubMedDate not supplied

Spinal fusion for kyphosis in achondroplasia.

Persistent thoracolumbar kyphosis in patients with achondroplasia is typically prevented with sitting modifications and bracing. When the kyphosis persists and progresses despite bracing, spinal fusion is indicated to prevent further progression and neurologic complications. Previous reports have suggested that instrumentation in such patients carries a high risk of neurologic injury. The purpose of this study was to evaluate the safety and efficacy of a two-stage procedure to control progressive kyphosis in the patient with achondroplasia. The authors treated four such patients (4-8 years old) surgically. The first stage involved an anterior spinal fusion with instrumentation and a posterior spinal fusion, and the second stage involved an additional posterior fusion. There were no neurologic complications. Correction ranged from 23.0% to 31.25%. All patients achieved a solid fusion. These results suggest that when nonoperative treatments fail, this procedure for thoracolumbar kyphosis in the achondroplastic patient can be done safely and effectively.

Achondroplasia↗
PubMed1988

Orthotic results in adolescent kyphosis.

Seventy-five patients with adolescent kyphosis, treated with Boston lumbar or the modified Milwaukee orthosis, were reviewed. For compliant patients, the average improvement in kyphosis was 27% in the Boston orthosis group and 35% in the Milwaukee orthosis group, despite the fact that the former group were younger and had smaller, more flexible curves. Compliance with orthosis wearing and, therefore, effective treatment was twice as likely with the Boston orthosis (61% compliance vs. 29% with the Milwaukee). Results in patients who wore their orthoses at least 16 hours per day were equal to results in patients with 23 hours of daily wear. In a small group of compliant patients with kyphotic deformities greater than 75 degrees, the Milwaukee orthosis was surprisingly effective. The Boston lumbar kyphosis orthosis offers a satisfactory alternative to the modified Milwaukee brace in adolescent kyphosis patients whose curves measure less than 70 degrees, especially if satisfactory compliance with brace wear is suspect.

Adolescent↗
PubMed1994

Realignment of postoperative cervical kyphosis in children by vertebral remodeling.

STUDY DESIGN: This study analyzed radiographically change in the sagittal curvature of the cervical spine after atlantoaxial (C1-C2) posterior fusion in children. OBJECTIVES: This study clarified the process of spinal remodeling after postoperative cervical deformation in children. SUMMARY OF BACKGROUND DATA: Postoperative spinal deformations in children are observed frequently. However, there have been only a few reports on postoperative changes in the sagittal curvature of the cervical spine and spinal remodeling after those changes. METHODS: Between 1979 and 1991, there was a total of 12 children who underwent C1-C2 posterior fusions. The average age at the time of surgery was 9.8 years. The alignment of the cervical spine was classified into four groups (lordosis, straight, kyphosis, and swan-neck deformity). Radiographic findings suggestive of the remodeling were as follows: 1) new bone formation on the anterior vertebral cortex, and 2) increase in body/canal ratio (BCR). The follow-up period averaged 6.2 years. RESULTS: Postoperative cervical malalignment (kyphosis or swan-neck deformity) occurred in four patients. In all four patients, new bone formation and increase in BCR at the apex of kyphosis were observed. Therefore, there was gradual improvement of the malalignment by vertebral remodeling. This phenomenon was not observed in eight patients with normal alignment. CONCLUSION: Realignment of postoperative cervical kyphosis by vertebral remodeling was observed in children. The results of this study suggested that remodeling occurred even in the spine, which was similar to the remodeling in long bones.

Atlanto-Axial Joint↗
PubMed1997

Validation of clinical measurement of kyphosis with a simple instrument, the arcometer.

STUDY DESIGN: Evaluation of concordance between different clinical surface measurements and radiographic measurements of kyphosis. OBJECTIVES: To validate a new instrument, the Arcometer, in the clinical assessment of kyphosis. SUMMARY OF BACKGROUND DATA: Although a few instruments are available that are designed to study the spine in the sagittal plane, they usually are not simple to use, and radiographic concordance data, when reported, are not optimal. METHODS: One hundred forty-five outpatients with different degrees of kyphosis were submitted to 1) spinal radiography and Arcometer evaluation (32 patients, 53 measurements); 2) Arcometer evaluation by two different observers (95 patients, 123 measurements); and 3) Arcometer evaluation by the same observer at two different times (16 patients, 56 measurements). RESULTS: The mean difference between the radiographic and Arcometer values was 2.9 degrees, whereas the interobserver difference was 1.1 degrees and intraobserver difference was 0.1 degree; the linear correlation between the first and the second measurement in the three groups was higher than 0.98. However, the standard deviation was rather wide- 8.8 degrees in sample one, 5.6 degrees in sample two, and 5.7 degrees in sample three. CONCLUSIONS: The Arcometer is a practical and reasonably reliable instrument. However, there is considerable disagreement with radiography and some interobserver and intraobserver variability. The arcometer may be useful in following patients with known kyphosis and in the general population screening to decrease x-ray exposure.

Adolescent↗
PubMed2000

A noninvasive anthropometric technique for measuring kyphosis and lordosis: an application for idiopathic scoliosis.

STUDY DESIGN: Cross-sectional measurement of the sagittal geometry of adolescent idiopathic scoliosis patients. OBJECTIVES: To evaluate the accuracy of a noninvasive anthropometric approach for the measurement of kyphosis and lordosis. SUMMARY OF BACKGROUND DATA: Noninvasive approaches were developed to estimate the sagittal curvatures of the spine. However, the magnitude of the estimation error could be high for an important proportion of patients, which leads to a difficult clinical application. METHODS: The group was composed of 124 female patients with a mean age of 13.5 years (SD 2. 7 years) with Cobb angles ranging from 4 degrees to 66 degrees. Kyphosis and lordosis were measured on the lateral radiograph. The spine sagittal curvature of the same patients was also estimated using the spatial localization of skin markers placed overlying the spinous processes. These coordinates served as input into a simple trigonometric model. Data were collected by means of a stereovideographic technique (Motion Analysis Corp., Santa Rosa, CA). RESULTS: The intraclass correlation coefficient between both approaches was 0.94 for kyphosis and 0.91 for lordosis; the mean absolute differences were 5 degrees (SD 4 degrees ) and 6 degrees (SD 6 degrees ), respectively. The difference was less than 10 degrees in 91% of the patients for kyphosis, and in 79% for lordosis. CONCLUSIONS: The proposed technique appears to give more representative results than those presented in the literature. It has the advantage of being part of a global noninvasive postural evaluation. Using this approach in a systematic manner could help reduce radiograph exposure while keeping track of the spine sagittal curvatures.

Adolescent↗
PubMed2000

Transoral decompression, anterior plate fixation, and posterior wire fusion for irreducible atlantoaxial kyphosis in rheumatoid arthritis.

STUDY DESIGN: Fifteen consecutive patients with irreducible atlantoaxial kyphosis caused by rheumatoid arthritis were treated by combined transoral odontoid resection, anterior plate fixation, and posterior wire fusion. OBJECTIVES: To investigate the clinical results of this new surgical procedure. SUMMARY AND BACKGROUND DATA: Irreducible atlantoaxial kyphosis in rheumatoid arthritis results from a destruction of the craniocervical joint ligaments and the anterior aspects of the lateral atlantoaxial joints. The development of a paradental synovial pannus and atlantoaxial joint impaction prevents reduction by conservative treatment, such as skull traction. Posterior surgical procedures for the treatment of the irreducible atlantoaxial kyphosis with spinal cord compression have been associated with high morbidity and mortality. METHODS: Fifteen consecutive patients were treated by transoral odontoid resection. The fixation was performed with anterior plating, according to the method of Harms in combination with posterior wire fusion according to Brooks. Before and after surgery, evaluation was performed using the parameters of pain (visual analog scale), range of motion, and subjective assessment of improvement and the Health Assessment Questionnaire. The neurologic deficit was defined according to the classifications proposed by Ranawat, Frankel, and Nurwick. Plain radiographs, including lateral flexion and extension views, and magnetic resonance scans were obtained. RESULTS: No perioperative fatality occurred. The average clinical and radiographic follow-up was 50.7 +/- 15.6 months (range, 26-77). Postoperative pain was relieved (mean pain score before surgery, 7.9 +/- 1.87; after surgery, 3.8 +/- 1.27), and the range of motion of all patients increased (mean 21.5 +/- 14.0 degrees for rotation; mean 17.2 +/- 5. 54 degrees for bending). The score on the Health Assessment Questionnaire increased in three patients, remained unchanged in three and decreased in six patients (three had died). All patients improved at least one Ranawat level after surgery, except a patient in Ranawat Class II, whose condition remained unchanged. All patients were satisfied with the procedure and reported subjective improvement. CONCLUSION: Transoral plate fixation combined with posterior wire fixation after transoral odontoid resectionis an effective, reliable, and safe procedure for the treatment of irreducible atlantoaxial kyphosis in rheumatoid arthritis.

Adult↗
PubMed2001

Reliability of centroid, Cobb, and Harrison posterior tangent methods: which to choose for analysis of thoracic kyphosis.

STUDY DESIGN: Thirty lateral thoracic radiographs were digitized twice by each of the three examiners. OBJECTIVES: To determine the reliability of the centroid, Cobb, and Harrison posterior tangent methods when applied to analysis of thoracic kyphosis. BACKGROUND DATA: Reliability studies on measurements of thoracic kyphosis are rare. METHODS: Blind, repeated-measures design was used. Thirty lateral thoracic radiographs were digitized twice by each of three examiners. To evaluate reliability of determining global and segmental alignment, vertebral bodies of T1-T12 were digitized. Centroids at the intersection of vertebral body diagonals and tangents to posterior vertebral bodies were constructed by computer. Also the computer constructed global and segmental centroid angles, Cobb angles (two-line method), and posterior tangent intersection angles from T1 to T12. Interclass and Intraclass correlation coefficients for these data were calculated and interpreted. RESULTS: From the points selected by examiners, all three methods have similar high ICC values for the global angles (> 0.94). For the segmental angles, the interobserver and intraobserver reliability is also very similar for all three methods, with ICCs in the good and excellent ranges (0.59-0.75 and 0.75-1.0, respectively). The mean absolute differences of observers' measurements are low, similar, and in the range of 0.9 degrees to 2.5 degrees. CONCLUSIONS: The centroid, two-line Cobb, and Harrison posterior tangent methods, when applied to measurements of kyphosis, are all reliable and have similar small error ranges. The centroid method does not give an accurate segmental analysis, uses more points and more time in clinical applications, and results in smaller angles of total kyphosis than the Cobb or posterior tangent methods. The posterior tangents are the slopes along the curve.

Humans↗
PubMed2001

Anterior instrumented fusion for thoracolumbar kyphosis in mucopolysaccharidosis.

STUDY DESIGN: A case series of seven children who had a thoracolumbar gibbus related to mucopolysaccharidosis treated with anterior instrumentation were reported retrospectively. OBJECTIVE: To describe a new technique for treating progressive thoracolumbar kyphosis in children with mucopolysaccharidosis. SUMMARY OF BACKGROUND DATA: Management of this condition is not well represented in the literature. Isolated reports on the surgical management of this disorder appear, but there is no previous report of correction performed anteriorly. METHODS: Seven patients underwent anterior instrumentation for correction of a thoracolumbar gibbus not arrested by brace treatment. Preoperative kyphosis ranged from 42 degrees to 64 degrees (average, 52.5 degrees ). Data on all seven patients were collected prospectively. The technique and its principles are described. RESULTS: A good correction of the kyphosis was obtained, with postoperative angles of 3 degrees to 29 degrees (average, 15 degrees ), and maintained through the follow-up period. There were no complications from the procedure. CONCLUSION: Anterior instrumented correction and fusion of the spine is effective in treating thoracolumbar kyphosis associated with mucopolysaccharidosis.

Adolescent↗
PubMed2002

Hyperrotatory paradoxic kyphosis.

STUDY DESIGN: A retrospective radiographic evaluation of 32 patients with hyperrotatory scoliosis accompanied by paradoxic hyperkyphosis, who were treated with posterior multilevel hook instrumentation. OBJECTIVES: To give a three-dimensional analysis of this particular deformity and to evaluate the coronal, sagittal, and horizontal plane corrections in these specific curves. SUMMARY OF BACKGROUND DATA: Lordoscoliosis with a severe rotational component produces paradoxic kyphosis in the sagittal plane. A vertebral derotational maneuver is essential to restore the normal sagittal alignment. METHODS: Thirty-two patients were treated with posterior multilevel hook instrumentation. Nine patients had previously undergone anterior release and fusion. The derotational maneuver could be accomplished in 21 cases. The coronal Cobb angle and the extents of apical vertebral rotation, sagittal hyperkyphosis, upper and lower compensatory lordosis, and sagittal trunk balance were measured after an average follow-up period of 5 years and 9 months. RESULTS: The mean coronal deformity decreased from 89.9 degrees before surgery to 40.7 degrees. The mean preoperative hyperkyphosis was 70.9 degrees in the thoracic spine, 45.9 degrees in the thoracolumbar spine, and 55 degrees in the lumbar region. These values were reduced to 39.7 degrees, 6.8 degrees, and -15 degrees, respectively. The lateral spinal balance changed from -21.3 mm to -8.5 mm. The average rotational correction measured by the method of Jackson was 51% before surgery and 39% after surgery (correction: 23.5%). There was a positive correlation between the preoperative kyphosis angle and the apical rotation (r = 0.58) and between the decrease of kyphosis and the correction of the rotation (r = 0.67) in cases when the derotational maneuver could be accomplished. CONCLUSIONS: If the apex of the scoliosis and the kyphosis are on the same level, the vertebral hyperrotation is responsible for the sagittal malalignment. Satisfactory results can be achieved with posterior multilevel hook instrumentation.

Adolescent↗