Incidence and Risk Factors for Concurrent Syndromic Diagnosis in Presumed Idiopathic Developmental Dysplasia of the Hip.

BACKGROUND: Infants referred for developmental dysplasia of the hip (DDH) may have a previously unidentified concomitant diagnosis of syndromic pathology. Our purpose was to examine the incidence of syndromic pathology in infants referred to a tertiary center with presumed idiopathic DDH and identify risk factors and difference in treatment courses between idiopathic and nonidiopathic cohorts. METHODS: A retrospective analysis of a prospective cohort of infants younger than 3 years who were evaluated for DDH between 2008 and 2013 with a minimum 2-year follow-up. The clinical history and treatment were noted to determine the incidence and nature of concomitant syndromic diagnoses, after a confirmed diagnosis of DDH. RESULTS: There were 202 patients: 177 were females (87.6%). Thirteen patients (6.4%) were later diagnosed with a neurologic/syndromic diagnosis. The workup leading to additional diagnosis was initiated by the orthopaedic surgeon in 8 of 13 patients (61.5%). Half of the referrals (4 of 8) made to other specialists were because of an abnormal treatment course (three-failure of typical DDH treatment and one-relapsed clubfeet). 7 of the 8 referrals were made because of developmental delays and decreased tone. 5 of the 13 nonidiopathic patients had other orthopaedic problems. The syndromic diagnoses included three cerebral palsy, two Kabuki syndrome, one Down syndrome, one myopathy, and one neuropathy. The diagnosis was made at an average of 2.3 years (0.04 to 4.7). No notable difference was observed in the incidence of the four known risk factors for DDH in syndromic patients compared with the idiopathic group. The syndromic patients required more open reductions (P = 0.002). DISCUSSION: By the age of 3 years, 6% of the patients treated for DDH were found to have a syndrome or neurologic abnormality, and the referral for workup was made by the treating surgeon greater than 60% of the time.

Preoperative mental health status is a significant predictor of postoperative outcomes in adolescents treated with hip preservation surgery.

PURPOSE: This study was designed to evaluate predictive factors that influence pain, mental health symptoms and postoperative outcomes at six-months post-hip preservation surgery (HPS) in adolescent surgical candidates. METHODS: In total, 58 HPS candidates (39 female, 19 male; mean age 15.53 years (10 to 19)) were evaluated. Diagnoses included: acetabular dysplasia (34); idiopathic femoroacetabular impingement (15); Perthes disease (six); avascular necrosis (six); and slipped capital femoral epiphysis (six). All patients underwent periacetabular osteotomy (36), surgical hip dislocation (17) or arthroscopy (five). Patients completed the following: Numerical Pain Rating Scale (NPRS); Child Health Questionnaire-87 (CHQ-87); Pediatric Symptom Checklist-Youth (PSC-Y), preoperatively and six months postoperatively. A single psychologist assessed patients in clinics and one to two additional appointments. RESULTS: In all, 78% of patients reported one to three years of pain prior to HPS (modified Harris hip score). All pain scores (NPRS) significantly decreased at six months postoperatively. Preoperative mental health scores (CHQ-87) significantly predicted postoperative pain scores (F(1, 57) = 4.07; p < 0.048; R2 = 0.068). Mental health symptoms (PSC-Y) decreased significantly (p < 0.001). Patients who were seen by a psychologist two or more times reported better six-month postoperative outcomes than those seen once: usual pain (NPRS; p = 0.012); patient-reported physical function (CHQ-87; p = 0.029); and mental health (PSC-Y; p = 0.019). HPS patients seen ≥ 60 days prior to surgery showed marked improvements at six months compared with patients seen < 60 days prior to surgery. CONCLUSION: HPS candidates evaluated preoperatively by psychology, as part of an integrated treatment approach, demonstrated statistically significant improvements in pain, health-related quality of life and mental health symptoms. Two+ visits, more than 60 days prior to surgery appears to be impactful. Preoperative pain and mental health symptoms were predictive of postoperative pain.Level of Evidence: II.

Rectus-sparing approach to the periacetabular osteotomy in adolescents preserves hip flexion strength.

PURPOSE: The classic periacetabular osteotomy (PAO) approach can result in hip flexor weakness in adolescents. The rectus-sparing approach (PAO-RS) preserves the origin of the rectus femoris tendon which may prevent hip flexor weakness and improve functional outcome. METHODS: This is a prospective analysis of adolescents treated with a PAO or PAO-RS. The PAO group included 24 hips/21 patients (18 female, meanage 16 years (sd 4)); the PAO-RS group included ten hips (eight female, mean age 16 years (sd 1)). Preoperatively, the PAO group had decreased hip flexion strength compared with the PAO-RS group (83 Nm/kg versus 102 Nm/kg). A subset of PAO patients (n = 13 hips/12 patients, nine female, mean age 15 years (sd 3)) were matched for preoperative flexion strength to the PAO-RS group. Radiographic parameters, modified Harris hip score (mHHS), isokinetic hip strength and instrumented motion analysis preoperatively, six months and one-year postoperatively were compared. RESULTS: There were no differences in preoperative deformity, postoperative correction or degree of correction between groups. Hip flexor strength decreased significantly at six months in the PAO group compared with the PAO-RS group (-35 Nm/kg versus -7 Nm/kg; p = 0.012), as did hip flexion pull-off power (1.33 W/kg PAO versus 1.76 W/kg PAO-RS; p = 0.010). Hip flexion strength improved from six months to one year in the PAO group, with no significant differences in strength at one year between groups (80 Nm/kg versus 90 Nm/kg). There were no differences between groups in mHHS any time point; both groups improved significantly postoperatively. CONCLUSION: Preserving the rectus femoris may lead to improved short-term hip flexor strength and pull-off power. Further assessment at long-term follow-up is needed to determine if this strength leads to improved functional outcomes. LEVEL OF EVIDENCE: II.

Treatment Patterns and Outcomes of Stable Hips in Infants With Ultrasonic Dysplasia.

INTRODUCTION: No clear practice guideline exists for the management of stable hip with ultrasonic dysplasia (UD). This study assessed the treatment patterns for stable UD and determined the outcomes of Pavlik harness (PH) treatment or observation (OB). METHODS: This is a prospective study of 80 infants (107 hips) aged ≤12 weeks at presentation diagnosed with stable UD. RESULTS: Sixty-five hips were treated with PH, whereas 42 hips were observed. Patients who were older at the time of initial sonogram and those with lower head coverage were more likely to be treated with PH. The mean head coverage was lower in the PH group, indicating more severe UD. At a 2-year follow-up period, 93% of patients in the OB group and 87% in the PH group had a good radiographic outcome. DISCUSSION: Head coverage and age at first sonogram had a significant influence on the treatment decision for PH. A milder ultrasonic hip dysplasia can be observed because 93% of the patients who were observed had a good outcome. LEVEL OF EVIDENCE: Level II: prospective cohort study.

Long-term Outcomes of Operative and Nonoperative Treatment of Congenital Coxa Vara.

BACKGROUND: Congenital coxa vara (CCV) is a rare hip condition with few long-term studies. The purpose of this study was to assess clinical, radiographic, and functional outcomes after operative and nonoperative treatment of CCV, assess reliability of radiographic parameters, and investigate risk factors for recurrence after surgery. METHODS: Retrospective review was performed of all CCV patients treated at 1 institution from 1980 to 2010. In addition, patients were recalled for additional follow-up x-rays, modified Harris Hip Score (mHHS), and gait analysis. Radiographic measurements [neck-shaft angle (NSA), head-shaft angle (HSA), Hilgenreiner-epiphyseal angle (HEA), and femoral neck length (FNL)] were assessed for reliability using intraclass correlation coefficients. Multivariate analysis was performed to identify risk factors for recurrence after surgery. RESULTS: Forty-six hips in 32 patients were reviewed. Mean age at presentation was 5.4±4.9 years. Mean follow-up was 11.8±5.8 years. Valgus proximal femoral osteotomy was performed in 27 hips (20 patients). Initial deformity was greater in the operative group (NSA 90±17 degrees, HEA 68±19 degrees) versus nonoperative patients (NSA 122±19 degrees, HEA 34±14 degrees) (P<0.0001), but radiographic outcomes were similar at follow-up. Most nonoperative hips had normal FNL growth rates (80%), but resolution of varus NSA occurred in only 21%. In contrast, 56% of operative hips showed decreased FNL growth rates. Interobserver reliability was excellent for HEA (0.98), NSA (0.90), and FNL (0.89), and good for HSA (0.79). Repeat osteotomy was performed in 6 cases (22%). No significant predictors for recurrence were identified. At long-term follow-up for recalled patients, 72% had significantly abnormal gait, and 50% had fair-poor functional outcomes (mHHS<79). CONCLUSIONS: Valgus osteotomy corrects severe deformity in CCV with improved clinical and radiographic outcomes. HEA and NSA are the most reliable radiographic measurements of proximal femoral deformity in CCV. Recurrence is not uncommon, but no predictors were identified. Many patients have persistent gait abnormalities and functional impairment at long-term follow-up, regardless of prior treatment. LEVEL OF EVIDENCE: Level III-retrospective cohort.

Perioperative Interdisciplinary Intervention Contributes to Improved Outcomes of Adolescents Treated With Hip Preservation Surgery.

BACKGROUND: Adolescent hip preservation surgery (HPS) candidates typically present with chronic pain, which can negatively affect psychological function and surgical outcomes. A previous study demonstrated high rates of psychological symptoms and maladaptive behaviors in this population. This study quantified psychological and functional improvements in these patients from preoperative presentation to postoperative follow-up. An integrated interdisciplinary approach is also described. METHODS: A total of 67 patients undergoing HPS were evaluated preoperatively and postoperatively at 1 year by staff psychologists. Perioperative psychological intervention consisted of education, counseling, and administration of self-report measures. Self-report measure scores were compared preoperatively and postoperatively, grouped by orthopaedic diagnoses. Frequency analysis, correlational analysis, and analysis of variance were conducted. RESULTS: Psychological function improved significantly at follow-up: decreased emotional symptomatology (46.1 to 43.6, P=0.013), anxiety (49.6 to 45.8, P<0.001), school problems (46.6 to 44.7, P=0.035), internalizing problems (46.3 to 44.1, P=0.015), social stress (44.5 to 42.3, P=0.024), sense of inadequacy (49.0 to 46.0, P=0.004), and increased self-concept (51.1 to 54.1, P=0.003). Resiliency factors also significantly improved: increased mastery (50.3 to 52.9, P=0.001) and resourcefulness (49.7 to 52.0, P=0.046), decreased emotional reactivity (46.3 to 42.9, P=0.001), and vulnerability (47.7 to 44.7, P=0.011). Physical function and return to activity also significantly improved (University of California-Los Angeles: 7.1 to 8.7, P=0.017; modified Harris Hip Score: 67.3 to 83.8, P<0.001). Return to activity positively correlated with optimism and self-efficacy (P=0.041). Femoroacetabular impingement and hip dysplasia patients consistently reported feeling less depressed (P=0.036), having fewer somatic complaints (P=0.023), fewer internalized problems (P=0.037), and exhibiting fewer atypical behaviors (P=0.036) at follow-up. Slipped capital femoral epiphysis patients did not demonstrate improvements in psychological functioning postoperatively. CONCLUSIONS: Perioperative psychological education and counseling, in combination with HPS, improved postoperative psychological and physical function. Patients reported reduced anxiety, school problems, and social stress, with marked increase in resilience. Increased mobility and return to activity significantly correlated with improved optimism and self-efficacy. LEVEL OF EVIDENCE: Level II-therapeutic studies-investigating the results of treatment.

A New Radiographic Classification System for Developmental Hip Dysplasia is Reliable and Predictive of Successful Closed Reduction and Late Pelvic Osteotomy.

BACKGROUND: The Tonnis radiographic classification of developmental dysplasia of the hip (DDH) has been used as a prognostic indicator for patients with walking-age DDH. The International Hip Dysplasia Institute (IHDI) classification, a new radiographic classification system, has been proposed to be more reliable by its creators. We sought to validate its reliability using independent observers, to compare it to the Tonnis method, and to assess its prognostic significance in a large cohort of patients. METHODS: A consecutive series of walking-age DDH patients were examined radiographically and classified by the Tonnis and IHDI schemes by 3 independent observers. Interobserver agreement was determined using the Kappa method. Clinical data were collected on patients with regard to success of closed reduction, need for later pelvic osteotomy, and presence of subsequent radiographic avascular necrosis (AVN). The prognostic value of the Tonnis and IHDI classifications to predict these clinical outcomes was determined. RESULTS: A total of 287 hips were available for analysis of the classification schemes. In total, 235 hips underwent attempted closed reduction and were eligible for analysis of successful closed reduction, and 131 hips had >4-year follow-up and were utilized for analysis of late pelvic osteotomy and AVN. Both classifications showed excellent interobserver reliability and in general, there was nonstatistically significant better reliability for the IHDI versus the Tonnis classification. In multivariate analysis, both IHDI and Tonnis classifications were found to be predictive of successful closed reduction and need for late pelvic osteotomy. Both methods showed trends toward being predictive of AVN rate, without statistical significance. CONCLUSIONS: The IHDI classification is subjectively more facile to use and has excellent interrelater agreement for classifying the radiographic severity of DDH. It is also reliable in predicting success of closed reduction and need for late pelvic osteotomy. SIGNIFICANCE: practitioners and researchers should consider the IHDI classification as a useful classification scheme and prognosticator when considering treatment options for late-presenting DDH. SIGNIFICANCE: Practitioners and researchers should consider the IHDI classification as a useful classification scheme and prognosticator when considering treatment options for late-presenting DDH. LEVEL OF EVIDENCE: Level III.

Overhead Bryant's Traction Does Not Improve the Success of Closed Reduction or Limit AVN in Developmental Dysplasia of the Hip.

BACKGROUND: Preoperative Bryant's overhead traction before closed reduction (CR) in developmental dysplasia of the hip (DDH) remains controversial and its success in increasing CR rates and reducing avascular necrosis (AVN) rates has not been specifically reported in a large cohort. METHODS: IRB-approved retrospective study of patients (below 3 y)who were treated with attempted CR for idiopathic DDH from 1980 to 2009. Successful CR was defined as a hip that remained reduced and did not require repeat CR or open reduction. Patients were grouped by age, hip instability [Ortolani positive (reducible) vs. fixed dislocation], and Tonnis classification and rates of successful CR were compared between groups with P<0.05. RESULTS: A total of 342 hips were included with a mean age of 0.9 years (0.2 to 2.8 y) and a mean follow-up of 10.4 years (2.0 to 27.7 y). There were 269 hips with fixed dislocations and 73 Ortolani-positive hips. Traction was used in 276 hips. There was no difference in traction utilization in the 3 age groups (below 1, below 1.5, and below 2 y) for either Ortolani-positive hips (P=0.947) or fixed dislocations (P=0.943). There was no difference in achieving a successful CR comparing traction (60.9%) and no-traction groups (60.6%) (P=1.00). For Ortolani-positive hips, traction did not improve the incidence of a successful CR for any age group: below 1 year: P=0.19; below 1.5 years: P=0.23; and below 2 years: P=0.25. Similarly, fixed dislocation patients had no benefit from traction: below 1 year: P=0.76; below 1.5 years: P=0.82; and below 2 years: P=0.85. Tonnis classification did predict success of CR but had no influence on traction success. There was no difference in the rate of AVN between the traction (18%) and no-traction (8%) groups for all patients (P=0.15). CONCLUSIONS: In this retrospective series, preoperative Bryant's traction does not improve the rate of a successful CR for patients with DDH and has no protective effect on the development of AVN of the femoral head. These results suggest that Bryant's overhead traction may not be warranted for patients below 3 years of age with DDH. LEVEL OF EVIDENCE: Level III.

Patient-Reported Health Outcomes After in Situ Percutaneous Fixation for Slipped Capital Femoral Epiphysis: An Average Twenty-Year Follow-up Study.

BACKGROUND: Percutaneous in situ fixation is the gold-standard treatment for stable slipped capital femoral epiphysis (SCFE). While numerous studies have documented good to excellent long-term clinical and radiographic outcomes, few have documented long-term patient-reported outcomes of patients with this condition. METHODS: This retrospective study was performed to document long-term patient-reported outcomes of a cohort of sixty-four patients with SCFE (ninety-one affected hips) and determine whether the slip angle was associated with poorer health outcomes as measured with the Short Form-12 (SF-12) Physical Component Summary (PCS) and Mental Component Summary (MCS) scores, modified Harris hip score (mHHS), and University of California at Los Angeles (UCLA) Activity Scale. RESULTS: The mean age at presentation was 12.6 years, and the mean duration of follow-up was 19.6 years. At the time of follow-up, the cohort reported higher rates of diabetes, obesity, and hypertension than the general U.S. POPULATION: The mean body mass index (BMI) had increased by 10.2 kg/m(2), with 72% of the subjects meeting the criteria for obesity (BMI > 30 kg/m(2)) at the time of follow-up. The mean age and sex-adjusted PCS and MCS scores were 49.6 and 50.0, respectively, and the mean mHHS was 84.9. Multivariable general linear modeling revealed no association between the initial slip angle and the PCS, MCS, mHHS, or UCLA Activity Scale score. Male sex and a lower BMI were the only predictors of better long-term PCS, mHHS, and UCLA Activity Scale scores. Subjects with a bilateral slip had outcomes similar to those with unilateral disease. CONCLUSIONS: The general self-reported health of this cohort was poor compared with that of the general population. The slip angle on presentation did not correlate with any patient-reported outcome measure collected for this study. Higher BMI was one of the only clinical predictors of patient-reported outcomes.

Improved functional outcome with no decrease in hip strength 2 years following Ganz periacetabular osteotomies for adolescent hip dysplasia.

To analyze outcomes of adolescents treated with a periacetabular osteotomies (PAO) with a minimum of 2 years of follow-up. Patients undergoing a PAO for adolescent hip dysplasia were analyzed preoperatively, 1 and 2 years postoperatively. In 32 dysplastic hips significant improvement was seen in all radiographic parameters. Gait speed, hip flexion pull-off power, and hip abductor moment impulse were unchanged postoperatively, whereas strength was maintained in 85% (abduction) and 95% (flexion). The Harris Hip Score increased from 67.1 to 77.9 to 81.3 at 1 and 2 years, respectively. Ganz PAO is effective in correcting dysplasia in adolescents radiographically and functionally.

Surgical Hip Dislocation is Safe and Effective Following Acute Traumatic Hip Instability in the Adolescent.

BACKGROUND: A traumatic hip dislocation in the pediatric patient is a rare but potentially catastrophic injury. The purpose of this study was to review our early clinical results and radiographic morphology of hips treated with a surgical hip dislocation (SHD) approach for intra-articular hip pathology resulting from traumatic instability in pediatric and adolescent patients. METHODS: This is a retrospective analysis of a consecutive series of patients presenting with nonconcentric reduction after traumatic hip instability. All patients were treated with a transtrochanteric SHD with concomitant procedures based on intra-articular findings. Radiographic evaluations and Harris Hip Scores were completed at final follow-up. RESULTS: Eleven male patients, mean age of 12.3 years (range, 9.3 to 16.1 y) and mean body mass index 19.6 kg/m (range, 15.4 to 28.0 kg/m). Intraoperative findings included: labral tear (8), femoral cartilage injury (5), acetabular rim fracture (4), acetabular cartilage delamination (3), loose body (2), and femoral head osteochondral fracture (1). Postoperatively, 1 patient developed a transient peroneal nerve palsy. At a mean 24.5 months (range, 12.0 to 48.1 mo) postoperatively, no hips have radiographic evidence of osteonecrosis. The mean lateral center edge angle was 20 degrees (range, 9 to 38 degrees) with 6 hips of <20 degrees; mean acetabular index 9 degrees (range, -2 to 23 degrees) with 5 hips of >10 degrees; mean α-angle 56 degrees (range, 48 to 62 degrees) with 6 hips of >55 degrees; mean acetabular version 12 degrees (range, 8 to 16 degrees) with 8 hips of <15 degrees. At 1-year follow-up, the mean Harris Hip Score was 95.8 (range, 84.7 to 100). CONCLUSIONS: Early results suggest that SHD is a safe approach to treat an incomplete reduction following posterior hip instability and is effective for identification and treatment of acute intra-articular pathology. Acetabular dysplasia, relative acetabular retroversion, and/or decreased femoral offset may be risk factors for posterior hip instability in adolescents. LEVEL OF EVIDENCE: Level IV.

Preoperative psychological findings in adolescents undergoing hip preservation surgery.

BACKGROUND: Chronic pain is associated with increased anxiety, depression, and maladaptive behaviors, especially in adolescents. We hypothesized that adolescents with chronic hip pain selected for hip preservation surgery (HPS) would demonstrate increased anxiety and depression compared with same-age peers. We designed a study to assess the psychological state of adolescents before HPS. METHODS: We prospectively evaluated 58 patients (23 males, 35 females), average age 16.5 years (range, 11 to 19 y) before HPS. Their diagnoses included: femoroacetabular impingement (n=25), acetabular dysplasia (16), Perthes disease (11), and slipped capital femoral epiphysis (6). Psychological questionnaires included patient-completed and parent-completed Behavioral Assessment System for Children, Second Edition (BASC-2), Beck Youth Inventory, Second Edition (BYI-II), and Resiliency Scales. Self-reported functional questionnaires included the modified Harris hip score (mHHS, max 100) and the UCLA activity score. Psychological scores were compared between diagnoses, procedures performed, and self-reported functional scores with a Student t test and ANOVA. RESULTS: All patients reported pain, 52 (90%) reported pain >6 months with 28 (54%) >1 year. A total of 44 patients (76%) reported moderate or severe pain. All reported decreased function: average UCLA 7.25 (range, 2 to 10), average HHS 65.5 (range, 27.5 to 97.9). At presentation, 10 patients (17.2%) were receiving psychological intervention and 30% had a family history of mental illness. On the basis of the BYI-II scales, 10% and 31% of patients reported at-risk or clinically significant symptoms of anxiety and depression, respectively. Similarly, using the BASC-2 measure, 28% and 14% reported at-risk or clinically significant anxiety and depression, respectively. Resiliency scales demonstrated that 21% to 36% of patients report maladaptive behavior. There were no significant correlations between any psychological score and diagnosis, procedure, or preoperative functional score. CONCLUSIONS: Preoperative evaluation identified patients who reported at-risk or clinically significant symptoms of anxiety and/or depression, with up to one third of patients reporting maladaptive behavior that may significantly influence their postoperative outcomes. Preoperative psychological evaluation, with appropriate intervention and follow-up, if needed, should be considered before surgery selection as mental health conditions may be undiagnosed and will likely influence functional outcomes.

High-grade SCFE: the role of surgical hip dislocation and reduction.

The patient with an unstable slipped capital femoral epiphysis poses a challenging problem to the treating physician to improve the position of the displaced epiphysis to avoid femoroacetabular impingement without developing avascular necrosis (AVN)-a potentially devastating complication. Although the standard operative procedure of in situ pinning following an incidental reduction while positioning the patient on the table, has been the mainstay of treatment in North America, other viable options are available including a surgical dislocation approach to the hip followed by a modified Dunn osteotomy with control of the retinacular vessels, reduction of the epiphysis, and internal fixation with pins or screws. Although technically demanding, this approach offers an opportunity to reduce the epiphysis to avoid femoroacetabular impingement, and limit the possibility for the development of AVN. The early results for this procedure are promising with all studies demonstrating excellent reduction of the epiphysis and an overall lower incidence of AVN when compared with in situ pinning.

Increased Body Mass Index Negatively Affects Patient Satisfaction After a Posterior Fusion and Instrumentation for Adolescent Idiopathic Scoliosis.

STUDY DESIGN: Retrospective. SUMMARY OF BACKGROUND DATA: Previous studies have reported the correlation of body mass index (BMI) with non-spine surgical outcomes; however, only a few reviewed the correlation of BMI to outcomes after spine surgery. OBJECTIVES: To review the influence of preoperative BMI on the follow-up clinical and functional outcomes after posterior-only fusion (PSF) and instrumentation for adolescent idiopathic scoliosis in a larger patient cohort. METHODS: Retrospective review of a consecutive series of patients treated with PSF for adolescent idiopathic scoliosis from 2002 to 2009 at a single institution. There were 3 categories: underweight (UW), normal weight (NML), and overweight (OW). Percent correction of the major curve was collected at 2 years postoperatively and patient outcome scores were analyzed preoperatively and at 2 years postoperatively. Differences between groups were analyzed using analysis of variance, with p < .05. RESULTS: A total of 459 patients at an average age of 15.0 years (range, 10.0-21.3 years) treated with PSF instrumentation were included. At 2 years, all groups achieved and maintained equal percent correction with no differences between groups. Regarding preoperative Scoliosis Research Society (SRS) outcome scores, OW patients reported more pain than NML (p = .002) and UW patients (p < .001) despite less reported activity than for the NML (p = .033) and UW groups (p = .005). The total SRS score was also lower in the OW patients compared with NML (p = .009) and UW patients (p = .002). At 2 years, the OW group reported more pain than the UW (p = .031) and NML groups (p = .018), lower mental scores (p = .011) and lower SRS total scores (p = .005) than the NML group. CONCLUSIONS: At follow-up, preoperative overweight adolescents reported more pain and lower mental, activity, and appearance domain scores after surgery than UW and NML patients despite equal percent curve correction. This information may help the surgeon with preoperative counseling of OW patients by stressing that their own assessment of outcome is influenced by BMI, which may help promote a healthy weight management program in this patient group.

Early results of the Bernese periacetabular osteotomy for symptomatic dysplasia in Charcot-Marie-Tooth disease.

INTRODUCTION: Charcot-Marie-Tooth disease (CMTD) is one of the most common inherited neurologic disorders and can be associated with hip dysplasia. Little is known regarding outcomes of the PAO for patients with CMTD. Our purpose is to document the early results and complications of the PAO for hip dysplasia associated with CMTD. METHODS: A two centre, retrospective clinical and radiographic review was performed. Demographic and surgical data were recorded. Pre- and postoperative lateral centre edge angle (LCEA), acetabular index (AI), ventral centre edge angle (VCEA), and Tönnis osteoarthritis grade were compared. Hips were classified according to Severin. The Harris Hip Score (HHS) and the Western Ontario and McMasters University (WOMAC) index documented self-reported function. RESULTS: Nineteen hips in 14 patients underwent PAO, mean age 16.2 (range 11.2-21 years). Thirteen concomitant procedures were performed, including seven proximal femoral osteotomies. Average follow-up was 3.4 years (range 0.9-8.5). Postoperative radiographic measurements significantly improved. Complications included femoral head AVN, transient complete bilateral peroneal nerve palsy, inferior rami fractures, and heterotopic ossification (Brooker stage 3). The HHS significantly improved from a mean 49.6 preoperatively to 82.2 at final follow-up of four patients. Seven subjects reported a mean postoperative WOMAC score of 94 (range 58.3-100). CONCLUSIONS: Most patients presented with severe dysplasia in the second decade of life. The PAO successfully corrected the radiographic abnormalities. Complications were common. The majority of patients reported improved outcomes, although seven showed signs of radiographic progression of osteoarthritis.

Increased acetabular depth may influence physeal stability in slipped capital femoral epiphysis.

BACKGROUND: Multiple mechanical factors affecting the hip have been associated with the development of slipped capital femoral epiphysis (SCFE). Whether acetabular depth plays a role in the development of a SCFE has not been elucidated. QUESTIONS/PURPOSES: (1) What is the prevalence of a deep acetabulum in SCFE? (2) Is the presence of a deep acetabulum associated with physeal instability? (3) Is the presence of a deep acetabulum associated with the occurrence of a contralateral SCFE? METHODS: We retrospectively reviewed 232 patients (156 males) who presented with a unilateral SCFE. Fifty (22%) subsequently developed a contralateral SCFE. The involved and uninvolved sides were evaluated for the presence of a deep acetabulum (DA). Preoperative radiographic parameters, slip stability, development of a contralateral SCFE, and demographic factors were then compared between patients with and without DA. RESULTS: DA was present in 120 hips (52%) with a SCFE. DA was more common in females (55 of 76 [72%]) than males (65 of 156 [42%]). Patients with DA presented with a higher lateral center-edge angle (33° versus 31°), slip angle (52° versus 43°), and with a lower body mass index (28.1 versus 30.0 kg/m(2)). Increased acetabular depth was more common in patients with an unstable SCFE (29 of 41 [71%]) than those with a stable SCFE (91 of 191 [48%]). The presence of DA either on the affected side or the contralateral side did not predict a contralateral SCFE. CONCLUSIONS: Despite not predicting a contralateral SCFE, DA may influence physeal stability if a SCFE does develop. Therefore, the contralateral hip with DA should be closely monitored. LEVEL OF EVIDENCE: Level II, prognostic study. See Guidelines for Authors for a complete description of levels of evidence.

Precocious appearance of the capital femoral ossific nucleus in Larsen syndrome.

BACKGROUND: Larsen syndrome is associated with multiple complications, including spinal deformities and recalcitrant joint dislocations. We noted capital femoral ossific nuclei on ultrasonographic images that were made for two infants with Larsen syndrome who were less than two weeks of age. We sought to confirm that this finding is common in patients with Larsen syndrome and unusual in patients with normal hips or idiopathic developmental dysplasia of the hip. METHODS: We identified eight patients with Larsen syndrome who had undergone ultrasonographic or radiographic evaluation of the hips before the age of three months. We compared the findings for these eight patients with those for forty consecutive patients from a prospective study of infants with developmental dysplasia of the hip who had ultrasonographic evaluation of the hips at approximately three months of age, including twenty patients who had normal clinical and ultrasonographic findings and twenty who had clinical instability of one or both hips. RESULTS: All eight patients with Larsen syndrome had radiographic or ultrasonographic evidence of an ossific nucleus at an average age of forty days (range, six to 115 days); four of these patients had evidence of an ossific nucleus at six to ten days of age. In comparison, only two of twenty normal infants (three of forty hips) and one of twenty infants (two of forty hips) with developmental dysplasia of the hip had ultrasonographic evidence of an ossific nucleus at an average age of eighty-four days (range, seventy-six to ninety-four days) (p < 0.0001, Fisher exact test). CONCLUSIONS: In this small group of patients with clinically documented Larsen syndrome, the capital femoral ossific nucleus was evident on ultrasonography of the hip as early as six days of age and was unusual in normal patients or those with idiopathic developmental dysplasia of the hip. The detection of precocious development of a capital femoral ossific nucleus in infants being screened for skeletal anomalies may warrant further evaluation for the possibility of the presence of Larsen syndrome.

Treatment of adolescents with a periacetabular osteotomy after previous pelvic surgery.

BACKGROUND: Although the success of the Bernese periacetabular osteotomy (PAO) has been reported for primary dysplasia, there is no study analyzing the radiographic, functional, and gait results of the PAO to correct residual hip dysplasia after previous pelvic surgery. QUESTIONS/PURPOSES: We assessed (1) radiographic and (2) functional and gait outcomes of patients treated with a PAO after previous pelvic surgery (PPSx) and compared their results with results of patients with no previous surgery (NPSx) to determine whether the PAO was equally effective in patients with revision pelvic surgery. METHODS: Twenty-nine dysplastic hips in 26 patients (average age, 16.3 years) were included: 13 in the PPSx group and 13 in the NPSx group. Radiographic parameters included the lateral center-edge angle, acetabular index, and femoral head extrusion index measured preoperatively and at 6 months and 1 year. We assessed preoperative and postoperative function using the Harris hip score (HHS). Preoperative and postoperative gait analysis included the hip abductor impulse. RESULTS: Improvements in groups were seen from preoperatively to 1 year postoperatively for the lateral center-edge angle, acetabular index, and femoral head extrusion index without differences between groups. The modified HHSs improved at 6 months and were maintained at 1 year for patients in both groups without differences between groups. The hip abductor impulse returned to preoperative values at 6 months in the NPSx group but not until 1 year in the PPSx group. CONCLUSIONS: The Bernese PAO is effective in providing similar final radiographic and functional results, however, a trend toward decreased hip flexion and abduction power at 1 year was seen with previous pelvic surgery.

Limited intraobserver and interobserver reliability for the common measures of hip joint congruency used in dysplasia.

BACKGROUND: A congruent hip frequently is cited in the literature as a prerequisite for performing a reconstructive pelvic osteotomy for hip dysplasia. The designation as congruent is important as incongruent joints generally are regarded as requiring a salvage-type procedure. Several measures of congruency are described in the literature, but it is unclear whether these measures are reliable. QUESTIONS/PURPOSES: We therefore evaluated the intraobserver and interobserver reliabilities of three measures of hip congruency in patients with mild to severe dysplasia. METHODS: We selected radiographs of 30 skeletally mature patients with symptomatic hip dysplasia who were potential candidates for a periacetabular osteotomy. All radiographs were rated by six reviewers on two occasions. Reviewers were shown a series of AP and von Rosen views of either the symptomatic hip or the contralateral side and asked to rate congruency using two previously published measures - the classifications of Yasunaga et al. and Okano et al. The reviewers also were asked to determine whether the hip was congruent based on their subjective opinion (yes/no). The radiographs were reviewed and measurements were repeated 1 month later. Kappa analysis was performed to determine intraobserver and interrater reliabilities between and among individual raters, respectively. RESULTS: Using the classifications of Yasunaga et al. and Okano et al., we found intraobserver reliability kappa values of 0.43 and 0.37, respectively and interobserver reliability values of 0.18 and 0.25, respectively. The intraobserver reliability of a subjective opinion of yes/no response was 0.74 while the interobserver reliability was 0.21. CONCLUSIONS: When evaluating a spectrum of hip dysplasia, commonly used measures of hip congruency have low intraobserver and interobserver relclassifications of Yasunaga et al. and Okano et al. Interobserver reliability for all three methods was low. New radiographic parameters to consistently identify congruency will be helpful for evaluating the preoperative indications for reconstructive osteotomy. CLINICAL RELEVANCE: Hip congruency has long been cited as a requirement for a reconstructive pelvic osteotomy, but based on the above findings, there is no clear agreement regarding what comprises a congruent joint. Thus, better criteria are needed to assess preoperative hip congruency to determine the role of congruency in patient outcomes after surgery for hip dysplasia.