Biomedical subjects

Perry L Schoenecker

Publications and source records attributed to Perry L Schoenecker.

At least 19 recordsLinked to original sources

PubMed2006

Femoral deformity in tibia vara.

BACKGROUND: Previous studies have suggested that compensatory valgus deformity of the femur is common in patients with tibia vara, or Blount disease. The availability and routine use of standing long-cassette radiographs of the lower extremities to assess angular deformities has allowed quantitative evaluation of this hypothesis. METHODS: The cases of all patients with tibia vara, two years of age or older, seen at our institution prior to treatment, over a thirteen-year period, were reviewed. Seventy-three patients with a total of 109 involved lower limbs were identified and were classified as having either infantile tibia vara (thirty-seven patients with fifty-six involved limbs) or late-onset tibia vara (thirty-six patients with fifty-three involved limbs). Standardized standing radiographs of the lower extremity were examined to assess the deformity at the distal part of the femur and the proximal part of the tibia by measuring the lateral distal femoral angle and the medial proximal tibial angle. RESULTS: The distal part of the femur in the children with infantile tibia vara either was normal or had mild varus deformity, with a mean lateral distal femoral angle of 97 degrees (range, 82 degrees to 129 degrees). The mean medial proximal tibial angle in these children was 72 degrees (range, 32 degrees to 84 degrees). Older children with infantile tibia vara were noted to have little distal femoral deformity, with no more than 4 degrees of valgus compared with either normal values or the contralateral, normal limb. Children with late-onset tibia vara had a mean lateral distal femoral angle of 93 degrees (range, 82 degrees to 110 degrees) and a mean medial proximal tibial angle of 73 degrees (range, 52 degrees to 84 degrees). On the average, the varus deformity of the distal part of the femur constituted 30% (6 degrees of 20 degrees) of the genu varum deformity in these patients. CONCLUSIONS: Patients with infantile tibia vara most commonly had normal alignment of the distal parts of the femora; substantial valgus deformity was not observed. Distal femoral varus constituted a substantial portion of the genu varum in children with late-onset disease. When correction of late-onset tibia vara is planned, the surgeon should be aware of the possibility that distal femoral varus is a substantial component of the deformity.

Adolescent↗

PubMed2006

Long-term follow-up of patients with clubfeet treated with extensive soft-tissue release.

BACKGROUND: Although long-term follow-up studies have shown favorable results, in terms of foot function, after treatment of idiopathic clubfoot with serial manipulations and casts, we know of no long-term follow-up studies of patients in whom clubfoot was treated with an extensive surgical soft-tissue release. METHODS: Forty-five patients (seventy-three feet) in whom idiopathic clubfoot was treated with either a posterior release and plantar fasciotomy (eight patients) or an extensive combined posterior, medial, and lateral release (thirty-seven patients) were followed for a mean of thirty years. Patients were evaluated with detailed examination of the lower extremities, a radiographic evaluation that included grading of osteoarthritis, and three independent quality-of-life questionnaires, including the Short Form-36 Medical Outcomes Study. RESULTS: At the time of follow-up, the majority of patients in both treatment groups had significant limitation of foot function, which was consistent across the three independent quality-of-life questionnaires. No significant difference between groups was noted with regard to the results of the quality-of-life measures, the range of motion of the ankle or the position of the heel, or the radiographic findings. Six patients who had been treated with only one surgical procedure had better ranges of motion of the ankle and subtalar joints (p < 0.004) than those who had had multiple surgical procedures. CONCLUSIONS: Many patients with clubfoot treated with an extensive soft-tissue release have poor long-term foot function. We found a correlation between the extent of the soft-tissue release and the degree of functional impairment. Repeated soft-tissue releases can result in a stiff, painful, and arthritic foot and significantly impaired quality of life.

Adult↗

PubMed2006

Periacetabular osteotomy in the treatment of severe acetabular dysplasia. Surgical technique.

BACKGROUND: The optimal treatment of severe acetabular dysplasia with subluxation of the femoral head or the presence of a secondary acetabulum remains controversial. The purpose of this study was to analyze the extent of surgical correction and the early clinical results obtained with the Bernese periacetabular osteotomy for the treatment of severely dysplastic hips in adolescent and young adult patients. METHODS: Sixteen hips in thirteen patients with an average age of 17.6 years (range, 13.0 to 31.8 years) were classified as having severe acetabular dysplasia (Group IV or V according to the Severin classification). Eight hips were classified as subluxated, and eight had a secondary acetabulum. Preoperatively, all patients had hip pain and sufficient hip joint congruency on radiographs to be considered candidates for the osteotomy. All sixteen hips underwent a Bernese periacetabular osteotomy, and six of them underwent a concomitant proximal femoral osteotomy. Postoperatively, the hips were assessed radiographically to evaluate correction of deformity, healing of the osteotomy site, and progression of osteoarthritis. Clinical results and hip function were measured with the Harris hip score at an average of 4.2 years postoperatively. RESULTS: Comparison of preoperative and follow-up radiographs demonstrated an average improvement of 44.6 degrees (from -20.5 degrees to 24.1 degrees) in the lateral center-edge angle of Wiberg, an average improvement of 51.0 degrees (from -25.4 degrees to 25.6 degrees) in the anterior center-edge angle of Lequesne and de Seze, and an average improvement of 25.9 degrees (from 37.3 degrees to 11.4 degrees) in acetabular roof obliquity. The hip center was translated medially an average of 10 mm (range, 0 to 31 mm). All iliac osteotomy sites healed. The average Harris hip score improved from 73.4 points preoperatively to 91.3 points at the time of the latest follow-up. Eleven of the thirteen patients (fourteen of the sixteen hips) were satisfied with the result of the surgery, and fourteen hips had a good or excellent clinical result. Major complications included loss of acetabular fixation, which required an additional surgical procedure, in one patient and overcorrection of the acetabulum and an associated ischial nonunion in another patient. Both patients had a good clinical result at the time of the latest follow-up. There were no major neurovascular injuries or intra-articular fractures. CONCLUSIONS: The periacetabular osteotomy is an effective technique for surgical correction of a severely dysplastic acetabulum in adolescents and young adults. In this series, the early clinical results were very good at an average of 4.2 years postoperatively; the two major complications did not compromise the good clinical results.

Acetabulum↗

PubMed2006

Surgical procedure profile in a comprehensive hip surgery program.

Surgical management of hip disease in adolescents and young to middle-aged adults is rapidly evolving, and a variety of operative techniques are needed to provide comprehensive care. The purpose of this study was to determine the utilization of surgical procedures and recent changes in procedure utilization in a comprehensive hip surgery program. We performed a retrospective review of 983 hip procedures in 854 patients performed over a seven year time period. The average patient age was 37.4 years (range 10-55). Five hundred fifty-six procedures were performed in female patients and 427 in male patients. Total hip arthroplasty (32.9%), hip arthroscopy (25.1%), and periacetabular osteotomy (13.1%) were the most common surgical procedures. Techniques utilized less often included osteochondroplasty of the femoral head-neck junction (7.9%), hip implant revisions (7.9%), and proximal femoral osteotomy (4.1%). Uncommon procedures included core decompression (2.2%), soft tissue releases (1.2%), femoral head resurfacing (0.6%), arthrodesis (0.3%), and Chiari pelvic osteotomy (0.2%). The most dramatic changes in utilization over the seven year time period included a marked increase in hip arthroscopies and osteochondroplasties of the femoral head-neck junction. These data underscore the variety of surgical techniques needed to treat this patient population, and emphasize an expanding role for nonarthroplasty surgical interventions.

Adolescent↗

PubMed2005

Preliminary assessment and treatment guidelines for hip disorders in young adults.

The treatment of hip disorders in adolescents and young adults has evolved rapidly during the past decade because of enhanced understanding of prearthritic and early arthritic hip disease combined with improved diagnostic skills, better patient selection criteria, and refinements in alternative surgical procedures. Despite these advancements, the diverse clinical conditions and available surgical options highlight the need to develop optimal diagnostic and treatment guidelines for young patients with compromised hip function. Comprehensive care of young patients with hip disorders includes diverse surgical techniques such as arthroscopy, pelvic osteotomies, osteoplasty, femoral osteotomies, surgical dislocation, grafting procedures, arthrodesis, and prosthetic replacement. Optimal clinical results depend on the combination of careful patient selection and successful application of the appropriate surgical procedure. We outline general guidelines for the assessment and treatment of hip pain in young adult patients.

Adolescent↗

PubMed2005

Primary and delayed closure after open irrigation and debridement of septic arthritis in children.

Seventy-one patients with 83 septic joints due to idiopathic septic arthritis were investigated retrospectively. Forty-three joints were closed primarily while 40 underwent delayed primary closure. Two joints in each group failed treatment and had to be reopened after definitive closure. Joints in patients 7 years of age or older had a substantially higher failure rate (12%), with either primary or delayed closure, than joints in patients younger than 7 years (1.7%). Two of 13 patients with a polymorphonuclear leukocyte count in the synovial fluid greater than 100,000 required repeat debridement after final closure. Three of the four patients who required repeat debridement showed evidence of osteomyelitis. The average length of stay was longer in the delayed primary closure group (7.0 days) than in the primary closure group (5.6 days). This study suggests that primary closure is a viable alternative to delayed primary closure with shorter hospital stays and similar outcomes in children with idiopathic septic arthritis. Care should be taken in children aged 7 and older or when concurrent osteomyelitis exists.

Adolescent↗

PubMed2005

Comparison of three heel cord surgeries in children with cerebral palsy.

This nonrandomized prospective descriptive study compared outcomes of three isolated heel cord surgeries in children with spastic diplegia cerebral palsy (CP): (1) heel cord advancement (HCA), (2) heel cord lengthening according to Vulpius (HCL-V), and (3) heel cord lengthening according to White (HCL-W). Thirty-two children were tested prior to and approximately 1 year after undergoing one of the three surgeries. Objective measures were collected for ankle passive and active range of motion, gross motor function measure (GMFM), and gait. All surgeries indicated significant improvements in end range passive and active ankle dorsiflexion, GMFM, and dorsiflexion during gait. Gait speed was significantly improved for the HCA group, but appeared to be the result of maturity. Gait speed for the HCL-V and HCL-W groups was unchanged. The study was the first to directly compare three heel-cord-lengthening surgeries.

Biomechanical Phenomena↗

PubMed2005

Comprehensive treatment of late-onset tibia vara.

BACKGROUND: Late-onset tibia vara (Blount disease) can be difficult to treat because of frequent morbid obesity and associated deformities, including distal femoral varus, proximal tibial procurvatum, and distal tibial valgus, that contribute to lower extremity malalignment. We present a comprehensive approach that addresses all components of the deformity and allows restoration of the anatomic and mechanical axes. METHODS: Fifteen consecutive patients (nineteen lower extremities) with late-onset tibia vara were managed with this comprehensive approach. The mean age of the patients at the time of surgery was 14.9 years, and the mean weight was 113 kg. Standing anteroposterior and lateral radiographs were made preoperatively and at the time of the final follow-up. Preoperatively, the mean mechanical axis deviation was 108 mm, the mean lateral distal femoral angle was 95 degrees , and the mean mechanical medial proximal tibial angle was 71 degrees . In all nineteen extremities, the proximal tibial varus deformity was corrected by means of a valgus osteotomy and application of an Ilizarov ring external fixator. Distal femoral varus was corrected by means of either hemiepiphyseal stapling or valgus osteotomy with blade-plate fixation in thirteen of the nineteen extremities. Distal tibial valgus was treated either with hemiepiphyseal stapling or with varus osteotomy and gradual correction with use of the Ilizarov external fixator in eleven of the nineteen extremities. RESULTS: After a mean duration of follow-up of 5.0 years, the mean mechanical axis deviation had improved to 1 mm (range, 20 to -30 mm), the lateral distal femoral angle had improved to 87 degrees (range, 83 degrees to 98 degrees), and the mechanical medial proximal tibial angle had improved to 88 degrees (range, 83 degrees to 98 degrees ). The mean time required for correction of the proximal tibial varus deformity was thirty-one days, and the external fixator was removed at a mean of 4.5 months postoperatively. All patients had development of one or more superficial pin-track infections (mean, 1.9 pin-site infections per patient). No wound infections, nonunions, or neurovascular complications occurred. Eighteen of the nineteen extremities were pain-free at the time of the final follow-up. CONCLUSIONS: This comprehensive approach allowed restoration of the mechanical and anatomic axes of the lower extremity in patients with late-onset tibia vara, resulting in a resolution of symptoms as a result of normalization of the weight-bearing forces across the knee and ankle. We believe that this approach will decrease the risk of early degenerative arthritis of the knee.

Adolescent↗

PubMed2005

Outcome of hemiepiphyseal stapling for late-onset tibia vara.

BACKGROUND: The results of hemiepiphysiodesis for the treatment of late-onset tibia vara have been reported to be favorable, but the technique requires careful timing and an accurate estimation of skeletal age. Hemiepiphyseal stapling does not require a careful estimation of skeletal age, and it has been reported to yield good results with low morbidity. However, we are not aware of any study evaluating the intermediate-term radiographic results or complications of this procedure. METHODS: Twenty-six patients with thirty-three extremities with late-onset tibia vara were treated with proximal tibial hemiepiphyseal stapling. Fourteen extremities had substantial concomitant distal femoral varus and also had hemiepiphyseal stapling of the distal part of the femur. Eighteen patients (twenty-three involved extremities) had juvenileonset tibia vara and eight patients (ten involved extremities) had adolescent-onset tibia vara. The mean age at the time of stapling was 11.8 years. The mean duration of follow-up was 3.8 years. We reviewed standardized standing radiographs to determine the mechanical axis deviation, the medial proximal tibial angle, the lateral distal femoral angle, and the zone of the knee through which the mechanical axis passed. RESULTS: The mean mechanical axis deviation improved from 58 mm (range, 27 to 157 mm) preoperatively to 22 mm (range, -33 to 117 mm) at the time of the last follow-up, and the mean medial proximal tibial angle improved from 77 degrees (range, 50 degrees to 85 degrees ) to 85 degrees (range, 48 degrees to 95 degrees ). In the fourteen lower extremities in which distal femoral hemiepiphyseal stapling was performed, the mean lateral distal femoral angle improved from 96 degrees (range, 92 degrees to 100 degrees ) to 86 degrees (range, 79 degrees to 97 degrees ). At the time of the final follow-up, seven extremities were considered to be in moderate varus; four, in mild varus; twenty, in normal alignment; and two, in valgus. No differences in radiographic outcome were noted between the juvenile and adolescent forms of tibia vara. Only one of the four extremities with severe preoperative varus was corrected to normal alignment; the remaining three were left with moderate varus. CONCLUSIONS: Hemiepiphyseal stapling of the lateral aspect of the proximal tibial physis and, as needed, the lateral aspect of the distal femoral physis is safe and effective in children with late-onset tibia vara if the physes are sufficiently open and the varus deformity is mild to moderate. Hemiepiphyseal stapling is particularly effective in patients who are ten years of age or younger. LEVEL OF EVIDENCE: Therapeutic Level IV.

Adolescent↗

PubMed2005

Periacetabular osteotomy for the treatment of severe acetabular dysplasia.

BACKGROUND: The optimal treatment of severe acetabular dysplasia with subluxation of the femoral head or the presence of a secondary acetabulum remains controversial. The purpose of this study was to analyze the extent of surgical correction and the early clinical results obtained with the Bernese periacetabular osteotomy for the treatment of severely dysplastic hips in adolescent and young adult patients. METHODS: Sixteen hips in thirteen patients with an average age of 17.6 years (range, 13.0 to 31.8 years) were classified as having severe acetabular dysplasia (Group IV or V according to the Severin classification). Eight hips were classified as subluxated, and eight had a secondary acetabulum. Preoperatively, all patients had hip pain and sufficient hip joint congruency on radiographs to be considered candidates for the osteotomy. All sixteen hips underwent a Bernese periacetabular osteotomy, and six of them underwent a concomitant proximal femoral osteotomy. Postoperatively, the hips were assessed radiographically to evaluate correction of deformity, healing of the osteotomy site, and progression of osteoarthritis. Clinical results and hip function were measured with the Harris hip score at an average of 4.2 years postoperatively. RESULTS: Comparison of preoperative and follow-up radiographs demonstrated an average improvement of 44.6 degrees (from -20.5 degrees to 24.1 degrees ) in the lateral center-edge angle of Wiberg, an average improvement of 51.0 degrees (from -25.4 degrees to 25.6 degrees ) in the anterior center-edge angle of Lequesne and de Seze, and an average improvement of 25.9 degrees (from 37.3 degrees to 11.4 degrees ) in acetabular roof obliquity. The hip center was translated medially an average of 10 mm (range, 0 to 31 mm). All iliac osteotomy sites healed. The average Harris hip score improved from 73.4 points preoperatively to 91.3 points at the time of the latest follow-up. Eleven of the thirteen patients (fourteen of the sixteen hips) were satisfied with the result of the surgery, and fourteen hips had a good or excellent clinical result. Major complications included loss of acetabular fixation, which required an additional surgical procedure, in one patient and overcorrection of the acetabulum and an associated ischial nonunion in another patient. Both patients had a good clinical result at the time of the latest follow-up. There were no major neurovascular injuries or intra-articular fractures. CONCLUSIONS: The periacetabular osteotomy is an effective technique for surgical correction of a severely dysplastic acetabulum in adolescents and young adults. In this series, the early clinical results were very good at an average of 4.2 years postoperatively; the two major complications did not compromise the good clinical results.

Acetabulum↗

PubMed2005

Use of an intramedullary rod for the treatment of congenital pseudarthrosis of the tibia. Surgical technique.

BACKGROUND: The treatment of congenital pseudarthrosis of the tibia remains difficult and controversial. The purpose of this study was to evaluate the long-term results of a technique consisting of excision of the pseudarthrosis, autologous bone-grafting, and insertion of a Williams intramedullary rod into the tibia. METHODS: Twenty-one consecutive patients with congenital pseudarthrosis of the tibia were managed with this technique between 1978 and 1999, and the results were retrospectively reviewed. The mean age of the patients at the time of the latest follow-up was 17.2 years (range, seven to twenty-five years), and the mean duration of postoperative follow-up was 14.2 years (range, three to twenty years). RESULTS: Initial consolidation occurred in eighteen of the twenty-one patients. Refracture occurred in twelve patients; five fractures healed with closed treatment, five healed after an additional surgical procedure, and two ultimately required amputation. Ten patients had an ankle valgus deformity after tibial union. Eleven patients had a residual limb-length discrepancy of >2 cm; six required a contralateral distal femoral and/or proximal tibial epiphyseodesis, two had a tibial lengthening, and one used a shoe-lift. Five patients had an amputation: two, because of a recalcitrant fracture; two, because of a limb-length discrepancy (6 and 9 cm); and one, because of a chronic lower-extremity deformity. CONCLUSIONS: This technique produced a satisfactory long-term functional outcome in sixteen of twenty-one patients and should be considered for the management of congenital pseudarthrosis of the tibia.

Bone Nails↗

PubMed2004

Intramedullary nailing of femoral fractures in children through the lateral aspect of the greater trochanter using a modified rigid humeral intramedullary nail: preliminary results of a new technique in 15 children.

OBJECTIVES: To evaluate the clinical results of intramedullary nailing of femoral shaft fractures using a rigid intramedullary nail placed through the lateral aspect of the greater trochanter in older children and adolescents. DESIGN: A retrospective study was carried out evaluating all skeletally immature patients with femoral shaft fractures treated using a modified rigid humeral intramedullary nail. PATIENTS/PARTICIPANTS: Fifteen children and adolescents with displaced femoral diaphyseal fractures and open physes. INTERVENTION: Femoral shaft fractures in children and adolescents were stabilized using a modified humeral intramedullary nail placed through the lateral aspect of the greater trochanter. MAIN OUTCOME MEASUREMENTS: Patients were evaluated to determine time to union, final fracture alignment, hospital stay, complications, clinical outcome, and proximal femoral changes including avascular necrosis or proximal femoral valgus with femoral neck narrowing. RESULTS: Fifteen patients were followed for a minimum of 1 year (range 70-157 weeks). The average age of the patients was 12 years and 5 months (range 8 years and 2 months-17 years and 1 month). All fractures healed at a mean of 7 weeks (range 5-14 weeks) after fracture. The average hospital stay for patients with isolated femur fractures (8/15) was 2.8 days (range 1-5 days). At an average follow-up of 141 weeks (range 70-326 weeks), no patient had developed avascular necrosis, femoral neck valgus, femoral neck narrowing, or other complications. CONCLUSIONS: The technique of intramedullary nailing in children through the lateral aspect of the greater trochanter seems to be safe, effective, and well tolerated by patients.

Adolescent↗

PubMed2004

Smoking and socio-economic status in the etiology and severity of Legg-Calvé-Perthes' disease.

BACKGROUND: The etiology of Legg-Calvé-Perthes disease is poorly understood. An association has been found in the past between Legg-Calvé-Perthes disease and smoking as well as low socio-economic status. METHODS: A prospective study was carried out in which families with a child diagnosed with Legg-Calvé-Perthes' disease were interviewed about the presence and duration of household second-hand smoke exposure to children. A control group of randomly selected families seen at our institution were interviewed with identical questions. The radiographs of children with Legg-Calvé-Perthes disease were reviewed and classified according to the Herring lateral pillar classification system. RESULTS: Thirty-eight of the 60 patients (63.3%) with Legg-Calvé-Perthes disease were noted to have at least one smoker living in the child's household with a mean of 1.03 smoker-years per year of life exposure to smoke. The median income of the patients with Legg-Calvé-Perthes disease was USD 20,300. The median income of the patients in the control group was USD 17,000. Thirty-eight of the 96 control patients (39.6%) were noted to have at least one smoker living in the child's household with a mean of 0.48 smoker-years per year of life. A significant association was noted between living with a smoker and Legg-Calvé-Perthes disease as well as between increasing smoke exposure and increased risk of developing Legg-Calvé-Perthes disease. No significant association was noted between lower income and Legg-Calvé-Perthes disease. There was no association between increased smoke exposure and increased severity of Legg-Calvé-Perthes disease as measured by the lateral pillar classification. CONCLUSIONS: The presence of second-hand smoke seems to be a significant risk factor in the development of Legg-Calvé-Perthes disease. The presence of second-hand smoke may represent the 'unknown industrial factor' that has been discussed.

Case-Control Studies↗

PubMed2004

Absent posterior tibial artery associated with idiopathic clubfoot. A report of two cases.

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Abnormalities, Multiple↗

PubMed2004

Differentiation between septic arthritis and transient synovitis of the hip in children with clinical prediction algorithms.

BACKGROUND: Differentiation between septic arthritis and transient synovitis of the hip in children can be difficult. Kocher et al. recently developed a clinical prediction algorithm for septic arthritis based on four clinical variables: history of fever, non-weight-bearing, an erythrocyte sedimentation rate of >or=40 mm/hr, and a serum white blood-cell count of >12000/mm(3) (>12.0 x 10(9)/L). The purpose of this study was to apply this clinical algorithm retrospectively to determine its predictive value in our patient population. METHODS: A retrospective review was performed to identify all children who had undergone a hip arthrocentesis for the evaluation of an irritable hip at our institution between 1992 and 2000. One hundred and sixty-three patients with 165 involved hips satisfied the criteria for inclusion in the study and were classified as having true septic arthritis (twenty hips), presumed septic arthritis (twenty-seven hips), or transient synovitis (118 hips). RESULTS: Patients with septic arthritis (true and presumed; forty-seven hips) differed significantly (p < 0.05) from patients with transient synovitis (118 hips) with regard to the erythrocyte sedimentation rate, differential of serum white blood-cell count, total white blood-cell count and differential in the synovial fluid, gender, previous health-care visits, and history of fever. If the four independent multivariate predictors of septic arthritis proposed by Kocher et al. were present, the predicted probability of the patient having septic arthritis was 59% in our study, in contrast to the 99.6% predicted probability in the patient population described by Kocher et al. Statistical analyses demonstrated that the best model to describe our patient population was based on three variables: a history of fever, a serum total white blood-cell count of >12000/mm(3) (>12.0 x 10(9)/L), and a previous health-care visit. When all three variables were present, the predicted probability of the patient having septic arthritis was 71%. CONCLUSIONS: Although the use of a clinical prediction algorithm to differentiate between septic arthritis and transient synovitis may have improved the utility of existing technology and medical care to facilitate the diagnosis at the institution at which the algorithm originated, application of the algorithm proposed by Kocher et al. or of our three-variable model does not appear to be valid at other institutions.

Algorithms↗

PubMed2004

Use of an intramedullary rod for treatment of congenital pseudarthrosis of the tibia. A long-term follow-up study.

Adolescent↗

PubMed2004

Medial translation of the hip joint center associated with the Bernese periacetabular osteotomy.

This study assessed medial translation of the hip joint achieved by the Bernese periacetabular osteotomy (PAO) in correcting residual acetabular dysplasia deformities. 86 hips in 75 patients with an average age of 25 years (range, 12-50) were treated for symptomatic acetabular dysplasia with a periacetabular osteotomy. Radiographic analysis was performed to assess correction of the acetabular deformity with specific attention to the horizontal position of the hip joint center. All hips were followed until bony union of the iliac osteotomy and the average follow-up was 28 months. The lateral center edge angle improved an average 31.6 degrees (-0.4 degrees preoperative, 31.2 degrees at follow-up). The anterior center edge angle improved 39.3 degrees (-4.5 degrees to 34.8 degrees). The acetabular roof obliquity improved an average 21.8 degrees (25.1 degrees to 3.3 degrees). Preoperatively, the average distance from the medial aspect of the femoral head to the ilioischial line was 17.6 mm. This distance was decreased to an average 7.8 mm postoperatively. This change resulted in an average medial translation of the hip joint center of 9.8 mm, (range -6 to 31mm). Overall, some degree of medial translation of the hip joint center was obtained in 79 (92%) of the hips. Four (5%) were maintained in the same horizontal position, and 3 (3%) had slight lateral repositioning. For the hips translated medially, the average change was 10.0 mm, and 72% of all hips had an optimal correction with the distance between the medial aspect of the femoral head and the ilioischial line being between 0 and 10 mm. This study demonstrates that in addition to optimizing femoral head coverage, a major and distinct advantage of the periacetabular osteotomy is reproducible and consistent medial translation of the hip joint center.

Acetabulum↗

PubMed2003

Hyperkyphosis as an indicator of syringomyelia in idiopathic scoliosis: a case report.

STUDY DESIGN: A case of thoracic hyperkyphosis is reported as an atypical presentation of otherwise typical adolescent idiopathic scoliosis that showed a large syringomyelia on magnetic resonance imaging. OBJECTIVE To review atypical curve patterns that indicate the need for more intensive preoperative workup including a magnetic resonance imaging scan. SUMMARY OF BACKGROUND DATA: The literature on atypical curve patterns of adolescent "non-idiopathic" scoliosis is reviewed. No report in the literature describes patients with an idiopathic coronal plane and thoracic hyperkyphosis as an atypical feature found to have a large syringomyelia and Chiari I malformation on magnetic resonance imaging examination. METHODS: The clinical and radiographic features associated with thoracic hyperkyphosis and juvenile and adolescent scoliosis with syringomyelia are presented. RESULTS: The neurosurgical treatment of the syringomyelia subsequently led to a potentially safer spinal fusion. The patient tolerated the procedures well and at this writing has remained asymptomatic during 3 years of follow-up evaluation. CONCLUSIONS: The reported case adds to the hyperkyphosis literature category of unusual spinal deformities seen in scoliosis associated with syringomyelia and should further help to categorize adolescent idiopathic scoliosis as a diagnosis of exclusion.

Acute Disease↗