Ludloff's medial approach for open reduction of congenital dislocation of the hip. A 20-year follow-up

Surgical Approaches for Managing Femoral Head Fractures (FHFs); What and How to Choose from the Different Options?

Femoral head fractures (FHFs) are considered a relatively uncommon injury; however, they carry a challenge to the trauma surgeon. Choosing the appropriate management option, either conservatively or surgically, if the latter was chosen, should it be open reduction and internal fixation or simple excision of the fragment, or acute total hip arthroplasty. Furthermore, selecting the best surgical approach through which surgical management could be performed depends on the fracture classification, the familiarity of the surgeon, and the presence of associated injuries. All approaches to the hip, including hip arthroscopy, had been proposed for the management of FHFs; however, the difference among approaches is related to the complexity of the approach, the need for special training or equipment, the effect of the approach on the functional outcomes as well as the rate of postoperative complications. This review discussed the possible surgical approaches used to manage FHFs, advantages, and disadvantages for each, and offered a guideline for selecting the most appropriate surgical approach.

Narrative Review of Complications Following DDH Treatment

BACKGROUND

The purpose of this narrative review was to survey the literature for common complications following treatment of DDH in children less than 4 years old.

METHODS

The Pubmed database was queried. Search result titles were reviewed to identify papers that were pertinent to the topic. Abstracts for these papers were obtained and read, and a subset of these were selected for review of the complete manuscript.

RESULTS

92 manuscripts were reviewed. Residual dysplasia, redislocation, and osteonecrosis are the primary complications of treatment in this age group. In the long term, hips without complications related to DDH treatment tend to do well, although a significant percentage of them will inevitably require joint replacement surgery.

CONCLUSION

Although there is excellent potential for a good outcome when DDH is diagnosed and treated under age 4 years, osteonecrosis continues to be a concern with all treatment methods. A subset of patients from this young cohort will continue to have residual dysplasia or recurrent dislocation requiring return to the operating room.

A Comparative Study of Salter Versus Pemberton Osteotomy in Open Reduction of Developmental Dysplastic Hips and Clinical Evaluation on Bhatti's Functional Score System

Objective

The study was aimed to compare the outcome of Salter’s and Pemberton’s osteotomy to achieve adequate acetabular coverage in the open reduction of developmental dysplastic hips (DDH). The functional outcome was evaluated as measured on Bhatti’s Functional Score System (BFSS).

Patients and methods

The study includes 60 children with 82 hips of developmental dysplasia in walking-age children. They were operated on for open reduction and Salter’s or Pemberton’s pelvic osteotomy to achieve concentric anatomical reduction with good anterolateral coverage of the femoral head. Patients for Salter’s and Pemberton's osteotomies were randomly selected. Preference was given to Pemberton’s osteotomy in cases with double/irregular acetabulum and in bilateral DDH. All patients were operated on by a single surgeon from January 2014 to December 2016 and were followed up till June 2020. The overall radiological outcome was assessed on Severin’s classification, comparing the pre and postoperative acetabular index (AI) and the clinical outcome on Bhatti’s Functional Score System.

Results

The overall functional behavior on Bhatti’s Functional Scoring revealed satisfactory outcome (excellent and good) in 73.17% (60/82) hips. On the radiological evaluation, 85.36% (70/82) hips achieved satisfactory development of hips (Severin Class IAB and IIAB) while 12.19% (10) hips developed a moderate deformity of the hip (Severin Class III; p>0.05). Comparing outcomes in both the Pemberton and Salter groups, the acetabular index significantly reduced after both procedures (p<0.05), however, the Pemberton group was more effective than the Salter group. Avascular necrosis (AVN) of Caput Femoris was noticed in 9.57% (8) hips, subluxations in 2.43% (2) hips, and impingement and stiffness in 12.19% (10) hips. Salter’s group had more numbers of AVN and subluxations as compared to the Pemberton group, whereas impingement and stiffness were more in Pemberton’s but none in the Salter group.

Conclusion

The hips with Pemberton’s acetabuloplasty exhibited better acetabular coverage and progressive development of hips as compared to Salter’s osteotomy group. Both groups, however, behaved equally on functional assessment with Bhatti’s Functional Score System. The risk of subluxation and AVN was found higher in Salter's group, and femoroacetabular impingement in Pemberton’s group. Pemberton’s osteotomy was the best option for a single-stage open reduction in bilateral DDH in terms of less risk of bleeding, good stability, better postoperative pain control, and a second surgery to remove transfixation K-wires.

Patient-reported outcomes in young adults with osteonecrosis secondary to developmental dysplasia of the hip - a longitudinal and cross-sectional evaluation

Background

Osteonecrosis of the femoral head is a common complication in the treatment of developmental dysplasia of the hip (DDH). While functional outcomes of affected patients are good in childhood, it is not clear how they change during the transition to young adulthood. This study determined the relationship between osteonecrosis and hip function, physical function and health status in adolescents and young adults.

Methods

We performed a cross-sectional study of 169 patients with a mean age of 19.7 ± 3.8 years with and without osteonecrosis following an open or closed reduction (1995–2005). We also performed a separate longitudinal evaluation of an historical cohort of 54 patients with osteonecrosis, embedded in this sample. All completed patient-reported outcome measures in 2015/2016 to quantify hip function (maximum score 100); physical function (maximum score 100); and general health status (maximum score 1). We graded all radiographs for subtype of osteonecrosis (Bucholz-Ogden); acetabular dysplasia (centre-edge angle); subluxation (Shenton’s line); and osteoarthritis (Kellgren-Lawrence). Analyses were adjusted for the number of previous surgical procedures on the hip and for the severity of residual hip dysplasia.

Results

In 149 patients (186 hips) with and without osteonecrosis, the mean differences (95% confidence interval) in hip function, physical function and quality of life were − 4.7 (− 10.26, 0.81), − 1.03 (− 9.29, 7.23) and 0.10 (− 1.15, 1.18), respectively. Adjusted analyses stratified across types of osteonecrosis showed that only patients with Bucholz-Odgen grade III had reduced hip function (p < 0.01) and physical function (p < 0.05) but no difference in health-related quality of life when compared to no osteonecrosis.

Conclusion

Osteonecrosis secondary to DDH is a relatively benign disorder in adolescents and young adulthood. Affected patients demonstrated minimal physical disability, a normal quality of life but reduced hip function.

A Comparative Study of Clinical and Radiological Outcomes of Open Reduction Using the Anterior and Medial Approaches for the Management of Developmental Dysplasia of the Hip

BACKGROUND

The literature is scanty on reports directly comparing the outcomes of anterior open reduction (AOR) and medial open reduction (MOR) in the management of developmental dysplasia of the hip (DDH).

PURPOSE OF THE STUDY

To compare clinical and radiographic outcomes of surgical treatment using either AOR or MOR in children with DDH aged < 24 months and to evaluate the procedure-inherent risks of avascular necrosis of the femoral head (AVN) and need for further corrective surgery (FCS).

METHODS

61 children who underwent surgical treatment for DDH were categorized into two groups: AOR (31 hips of 28 patients) and MOR (39 hips of 33 patients). The mean age was 17 ± 5.85 (range 7-24) months in group AOR and 13 ± 5.31 (range 6-24) months in group MOR. The mean follow-up was 118 ± 41.2 (range 24-192) months and 132 ± 36.7 (range 24-209) months in group AOR and MOR. At the final follow-up, mid- to long-term clinical and radiographic outcomes were assessed. FCS was recorded.

RESULTS

Regarding McKay's clinical criteria, both groups exhibited similar results (p = 0.761). No significant differences were observed between the groups in both the center-edge-angle (p = 0.112) and the Severin score (p = 0.275). The AVN rate was 32% in the AOR group and 20% in the MOR group (p = 0.264). The FCS rate was 22% in the AOR group and 12% in the MOR group (p = 0.464).

CONCLUSIONS

This study showed similar clinical and radiological outcomes with AOR and MOR with no significant relation to AVN and FCS.

LEVEL OF EVIDENCE

Level III.

Early open reduction of dislocated hips using a modified Smith-Petersen approach in arthrogyposis multiplex congenita

Background

Arthrogryposis multiplex congenita (AMC) is a rare syndrome with multiple joint contractures. Within the medical community, there is controversy surrounding AMC in terms of the ideal surgical approach and age for performing a reduction of dislocated hips. The purpose of this retrospective study was to evaluate the clinical outcomes of early open reduction of infant hip dislocation with arthrogryposis multiplex congenita following a modified Smith-Petersen approach that preserves the rectus femoris.

Methods

From 2010 to 2017, we performed this procedure on 28 dislocated hips in 20 infants under 12 months of age with AMC. The clinical and radiology data were reviewed retrospectively. The mean age at surgery was 6.9 ± 5.1 months, with a mean follow-up of 42.4 ± 41.1 months.

Results

After open reduction, the average hip acetabular index (AI), the international hip dysplasia institute classification (IHDI), and the hip range of motion significantly improved (all P < 0.001). After the surgery, 16 patients were community walkers, and four patients were home walkers. Three hips in two patients required secondary revision surgery for residual acetabular dysplasia with combined pelvic osteotomy and femoral osteotomy. Seven of the hips that had been operated on showed signs of avascular necrosis (AVN). Among them, four were degree II, two were degree III, and one was degree IV. Multiple linear regression analysis demonstrated that greater age (in months) heightened the risk for secondary revision surgery (P = 0.032).

Conclusions

The modified Smith-Petersen approach preserving the rectus femoris is an encouraging and safe option for treating hip dislocation in young AMC patients (before 12 months). If surgery takes place at less than 12 months of age for patients with AMC, this earlier open reduction for hip dislocation may reduce the chances of secondary revision surgery.

Level of evidence

IV, retrospective non-randomized study.

Comparison of Open Reduction Alone and Open Reduction Plus Pemberton Osteotomy Techniques in the Treatment of Developmental Hip Dysplasia at Walking Age

Objective

Open reduction (OR) alone and OR plus Pemberton periacetabular osteotomy (PPO) techniques are commonly used in the treatment of developmental dysplasia of the hip at walking age. However, discussions on the timing of acetabular osteotomy are still ongoing. The aim of the present study was to compare the results of patients who underwent Ferguson OR (FOR group) and OR plus PPO group.

Materials and Methods

Between 2008 and 2017, we performed surgery on the hips, which we thought were used for closed reduction but could not be reduced as closed, or that the reduction was not stable. Patient follow-up was ≥12 months. The study included 75 hips of 57 patients of which 20 (26.7%) patients with FOR and 55 (73.3%) patients with PPO. Preoperative and postoperative acetabular indices (AIs), additional surgical intervention rates, and avascular necrosis (AVN) rates were compared. The Kalamchi-McEwen classification system was used to evaluate AVN.

Results

The average age of the patients was 12.38 (9-14) months. The mean follow-up period was 38.95 (12-140) months. AVN developed in 21 (24%) hips (6 (8%) type 1, 13 (17.3%) type 2, and 2 (2.7%) type 3). AVN developed in 7 (35%) hips in the FOR group and 14 (25.5%) hips in the PPO group. No statistically significant difference was found between the two groups (p=0.416). Revision surgery was performed in 2 (3.7%) cases of the PPO group and 6 (31.5%) cases of the FOR group. Statistically, the PPO group had less revision surgery (p=0.004). The PPO group had an AI of 13.33° (5°-27°) that was significantly lower (p<0.001) than that of 27.98° (18.39°) of the FOR group.

Conclusion

Ferguson and Pemberton techniques are current and effective in the treatment of patients with developmental hip dysplasia at walking age. There was no significant difference between the two groups when examined from the point of view of AVN, but the results of PPO surgery were found to be better with respect to AI and revision surgery.

Radiological and clinical outcomes of medial approach open reduction by using two intervals in developmental dysplasia of the hip

OBJECTIVE

To evaluate the midterm clinical and radiological outcomes of the medial approach using two intervals for developmental hip dysplasia (DDH).

METHODS

The study involved 62 hips of 47 patients (41 girls, 6 boys) treated with medial approach for DDH from 1999 to 2010. The age of the patients at surgery was 18.7 ± 2.25 months. Follow up of the patients was 11.3 ± 3.07 years. The age of the patients at the last follow up was 12.6 ± 1.74 years. According to the Tönnis classification, 13 hips were grade II, 27 hips were grade III and 22 hips were grade IV. Patients were evaluated according to Omeroglu radiological criteria and modified McKay functional criteria. The presence of avascular necrosis (AVN) of the hip was questioned using the KalamchiMacEwen classification.

RESULTS

Radiologically, forty eight (77%) hips were evaluated as "excellent", 8 (13%) hips as "good" and 5 (8%) hips as "fair plus" and 1 (%2) hip as "fair minus". Two (3%) patients had type 1 temporary AVN and one (1%) patient had type 4 AVN with coxa magna and overgrowth of the greater trochanter. According to McKay functional criteria, 56 (90%) hips had "excellent" and 6 (10%) had "good" results. Two (3.2%) hips of one patient had to be reoperated with Salter osteotomy and femoral shortening + derotation osteotomy.

CONCLUSION

Medial approach using two separate intervals for tenotomy and capsulotomy does not jeopardize the medial circumflex or the femoral vessels and yields satisfactory midterm results for children 18 months old with dysplasia of the hip.

LEVEL OF EVIDENCE

Level IV, therapeutic study.

Acetabular development after open reduction to treat dislocation of the hip after walking age

BACKGROUND

Treatment of hip dislocation diagnosed after walking age is often difficult. We report the surgical treatment of these patients by open reduction with a soft tissue surgical procedure without osteotomy.

METHODS

Thirty-eight children (43 hips) diagnosed with complete dislocation of the hip after walking age were included in this study. We radiographically analysed postoperative hip joint development up to 6 years of age. To assess the predictors of acetabular development, we evaluated the radiographs, using an acetabular index of ≤35° and a centre-edge angle of >5° at 6 years of age as satisfactory outcomes, and evaluated the advance of acetabular development over time.

RESULTS

AI on the affected side was improved with time after open reduction. The diameter of the capital femoral ossific nucleus on the affected side was almost equivalent to that on the unaffected side at 6-12 months after surgery, after which the centre-edge angle improved gradually from one year after surgery. We compared hips classified as satisfactory to unsatisfactory at 6 years of age, and found that the centre-edge angle at one year after open reduction was significantly associated with acetabular development (P = 0.044). The cut-off value was -2° with sensitivity of 0.909 and specificity of 0.677.

CONCLUSIONS

The results of the current study suggest that initial development of the capital femoral ossific nucleus after open reduction would be followed by improved joint congruity, and that this would facilitate acetabular development. The centre-edge angle at one year after surgery could be regarded as a potential predictor of acetabular development in open reduction surgery for late-diagnosed developmental dysplasia of the hip cases.

Single-stage medial open reduction and Pemberton acetabuloplasty in developmental dysplasia of the hip

In this study, we aimed to evaluate the long-term clinical and radiological results of single-stage open reduction through a medial approach and Pemberton acetabuloplasty in developmental dysplasia of the hip. We treated 32 hips (22 patients) with developmental dysplasia by a single-stage open reduction through Ferguson's medial approach and Pemberton acetabuloplasty. The procedure was performed bilaterally in 10 patients. The mean age of the patients at the time of the operation was 19.8 months (16-24 months). The mean follow-up period was 10.9 years (7-19 years). Group I avascular necrosis according to the Kalamchi and MacEwen classification was observed in two hips and group II in one hip. Radiologically, 90.6% of the hips were classified as Severin class I and 9.4% of the hips were classified as Severin class II. At the latest follow-up, 30 hips were assessed clinically as excellent and two hips as good. No patient required subsequent surgery. We conclude that single-stage medial open reduction and Pemberton acetabuloplasty represent an effective method for developmental dysplasia of the hip in children older than 15 months of age.

Surgical Management of Pediatric Developmental Dysplasia of the Hip

In pediatric patients with developmental dysplasia of the hip with late presentation or failure of nonsurgical treatment, surgical management is indicated. The goal of surgery is to obtain a stable reduction to promote development of the femoral head and acetabulum while avoiding osteonecrosis of the femoral head and the need for further surgery. Treatment is related to the age of the patient and the degree of soft-tissue contracture or bony deformity present. As a general rule, in children aged <12 months, closed reduction and spica casting is preferred. Children aged 12 to 18 months may require open reduction, which can be performed safely through a medial or anterior approach. In children aged 18 months to 3 years, residual bony deformity can be corrected with a femoral or pelvic osteotomy in addition to open reduction. In children with complex deformity or in children aged >3 years, both pelvic and femoral osteotomies are commonly required to stabilize an open reduction.

Association between open or closed reduction and avascular necrosis in developmental dysplasia of the hip: A PRISMA-compliant meta-analysis of observational studies

BACKGROUND

The risk of avascular necrosis of the femoral head (AVN) after treatment of developmental dysplasia of the hip is associated with the method of reduction. Some authors have suggested that open reduction is a risk factor for AVN; however, this is controversial. To our knowledge, a quantitative comparison of the incidence of AVN between closed and open reduction has not been conducted.

METHODS

Published studies were identified by searching PubMed, EMBASE, and the Cochrane Library up to May, 2015, focusing on the incidence of AVN after closed or open reduction for developmental dysplasia of the hip in children aged <3 years. Patients were age-matched who were treated by either closed or open reduction, but without pelvic or femoral osteotomy. Two authors independently assessed eligibility and abstracted data. Discrepancies were discussed and resolved by consensus. We pooled the odds ratios (ORs) and 95% confidence intervals (95%CIs) from individual studies using a random-effects model and evaluated heterogeneity and publication bias.

RESULTS

Nine retrospective studies were included in this analysis. The pooled OR for comparing open reduction with closed reduction for all grades of AVN was 2.26 (95%CI = 1.21-4.22), with moderate heterogeneity (I = 44.7%, P = 0.107). The pooled OR for grades II to IV AVN was 2.46 (95%CI = 0.93-6.51), with high heterogeneity (I = 69.6%, P = 0.003). A significant association was also found for the further surgery between open and closed reduction, with a pooled OR of 0.30 (95%CI = 0.15-0.60) and moderate heterogeneity (I = 46.4%, P = 0.133). No evidence of publication bias or significant heterogeneity between subgroups was detected by meta-regression analyses.

CONCLUSION

Findings from this meta-analysis suggest that open reduction is a risk factor for the development of AVN compared with closed treatment. Future studies are warranted to investigate how open reduction combined with pelvis and/or femoral osteotomy affects the incidence of AVN.

Long-term outcome following medial open reduction in developmental dysplasia of the hip: a retrospective cohort study

INTRODUCTION

Avascular necrosis (AVN) is a serious complication of treatment for developmental dysplasia of the hip. There is ongoing controversy regarding AVN and its influence on hip development following medial open reduction (MOR).

PURPOSE

The aim of our study was to (1) determine the long-term prevalence of AVN following MOR, (2) evaluate hip development after MOR, and (3) identify predictors of AVN and radiographic outcome at skeletal maturity after MOR.

METHODS

A retrospective cohort analysis of 60 patients (70 hips) who underwent MOR with a mean follow-up of 10.83 years (5.23-16.74) was conducted. AVN was recorded according to Bucholz and Ogden classification and radiographic outcome based on Severin grading. AVN and hip morphology related to length of follow-up were evaluated. Chi-squared and t-tests were used to identify relationships between AVN and other variables. Logistic regression was used to assess predictors of AVN and Severin outcome.

RESULTS

The rate of clinically significant AVN (types 2-4) following MOR was 32.9 % with type 2 accounting for 82.6 % of these cases. While early acetabular development was satisfactory, long-term outcome was unsatisfactory in 26 % of cases with AVN (vs 8.7 % of cases without AVN). A higher rate of AVN was identified when hips were immobilized in ≥60° of abduction postoperatively. A higher rate of poor Severin outcome was identified in hips with AVN.

CONCLUSIONS

Our findings suggest that there is a high rate of AVN and unsatisfactory long-term outcome following MOR. AVN remains a significant concern following MOR surgery for developmental dysplasia of the hip that may not be apparent until long-term evaluation.

Is Age or Surgical Approach Associated With Osteonecrosis in Patients With Developmental Dysplasia of the Hip? A Meta-analysis

BACKGROUND

Osteonecrosis of the femoral head is a major complication that negatively impacts the clinical and radiographic long-term outcome after treatment of developmental hip dysplasia (DDH). There are conflicting results in the literature whether age at the time of closed or open reduction and a specific surgical approach are associated with osteonecrosis. Better understanding of the impact of age at reduction and surgical approach is important to reduce the risk of osteonecrosis in patients with DDH.

QUESTIONS/PURPOSES

We aimed to evaluate the association between occurrence of osteonecrosis and (1) age at closed reduction; (2) age at open reduction; and (3) medial versus anterior operative approaches.

METHODS

A systematic review identified studies reporting osteonecrosis occurrence after treatment of DDH and at least 2 years of followup. This study was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement. Methodologic quality was assessed using the methodologic index for nonrandomized studies. Generalized logistic models were used to estimate pooled odds ratios (ORs) in the meta-analysis. Sixty-six studies were included in the systematic review and 24 in the meta-analysis. Data on 481 hips treated by closed reduction and 584 hips treated by open reduction were available to evaluate the association between osteonecrosis and age. The association between osteonecrosis and operative approach was assessed using data on 364 hips treated by medial open reduction and 220 hips treated by anterior open reduction.

RESULTS

Age at reduction (> 12 months versus ≤ 12 months) was not associated with osteonecrosis after closed reduction (OR, 1.1; 95% confidence interval [CI], 0.4-3.2; p = 0.9) or open reduction (OR, 1.1; 95% CI, 0.7-1.9; p = 0.66). The overall, adjusted incidence of osteonecrosis (≥ Grade II) was 8.0% (95% CI, 2.8%-20.6%) among patients treated with closed reduction at or before 12 months of age and 8.4% (95% CI, 3.0%-21.5%) among those treated after 12 months. Similarly, the odds of osteonecrosis after open reduction did not differ between patients treated after the age of 12 months compared with those treated at or before 12 months (OR, 1.1; 95% CI, 0.7-1.9; p = 0.7). The incidence of osteonecrosis (≥ Grade II) was 18.3% (95% CI, 11.7%-27.4%) among patients who had index open reduction at or before 12 months of age and 20.0% (95% CI, 13.1%-29.4%) among those who had index open reduction after 12 months of age. Among hips treated with open reductions, there was no difference in osteonecrosis after medial versus anterior approaches (18.7% medial versus 19.6% anterior; OR, 1.1; 95% CI, 0.5-2.2; p = 0.9). Conclusions We did not find an association between closed or open reduction performed at or before 12 months of age and an increased risk of osteonecrosis of the femoral head. Delayed treatment past 1 year of age as a strategy to reduce the development of osteonecrosis was not supported by this meta-analysis. Open reduction through a medial or anterior approach may be recommended based on surgeon's preference, because we found no association between development of osteonecrosis and the type of surgical approach. However, many of the studies in the current literature are nonrandomized Level III or IV observational studies of inconsistent quality. Higher quality evidence is needed to better understand the effects of age at reduction and operative approach on the development of osteonecrosis after DDH treatment.

LEVEL OF EVIDENCE

Level III, therapeutic study.

How Does Bony Surgery Affect Results of Anterior Open Reduction in Walking-age Children With Developmental Hip Dysplasia?

BACKGROUND

Anterior open reduction is commonly used to treat hip subluxation or dislocation in developmental dysplasia of the hip (DDH) in walking-age children. Pelvic and/or femoral osteotomy may be used in addition, but it is unclear how this affects avascular necrosis (AVN) risk and radiological and clinical results.

QUESTIONS/PURPOSES

The purpose of this study was to review studies of walking-age patients treated either with an open reduction alone or combined with pelvic and/or femoral osteotomies and determine whether there is a difference between groups in the proportion of patients: (1) developing clinically relevant femoral head AVN (Kalamchi & MacEwen Types II to IV or equivalent); (2) achieving a satisfactory radiological result (Severin Grade I/II or equivalent); (3) achieving a satisfactory clinical result (McKay excellent or good rating or equivalent); and (4) requiring further nonsalvage surgery.

METHODS

MEDLINE, Embase, the Cochrane Centre Register of Controlled Trials, and ClinicalTrials.gov were searched for studies of anterior open reduction for DDH in children aged 12 months to 6 years old. We assessed AVN, clinical and radiological results, and requirement for further procedures. The effect of failed conservative management, traction, age at operation, and followup duration was also assessed. Eighteen studies met the review eligibility criteria.

RESULTS

Open reduction alone had a lower risk of AVN than open reduction combined with pelvic and femoral osteotomy (4% versus 24%), but there was no significant difference compared with open reduction with either pelvic (17%) or femoral osteotomy (18%). More hips treated with open reduction alone had satisfactory radiological results than open reduction combined with pelvic and femoral osteotomy (97% versus 83%) and satisfactory clinical results than all other interventions. More hips treated with open reduction alone required further surgical management (56%) compared with open reduction and pelvic osteotomy (11%) and combined pelvic and femoral osteotomies (8%).

CONCLUSIONS

Open reduction with concomitant pelvic osteotomy is the most appropriate option to provide durable results with the lowest risk of AVN and best radiological and clinical results. There is no evidence that addition of a femoral osteotomy provides any additional benefit to the patient, although it may be necessary to achieve reduction.

LEVEL OF EVIDENCE

Level III, therapeutic study.

Early treatment with the von Rosen splint for neonatal instability of the hip is safe regarding avascular necrosis of the femoral head: 229 consecutive children observed for 6.5 years

BACKGROUND AND PURPOSE

Avascular necrosis of the femoral head (AVN) is a complication in treatment of developmental dysplasia of the hip (DDH). We evaluated the risk of AVN after early treatment in the von Rosen splint and measured the diameter of the ossific nucleus at 1 year of age.

CHILDREN AND METHODS

All children born in Malmö, Sweden, undergo clinical screening for neonatal instability of the hip (NIH). We reviewed 1-year radiographs of all children treated early for NIH in our department from 2003 through 2010. The diameter of the ossific nucleus was measured, and signs of AVN were classified according to Kalamchi-MacEwen. Subsequent radiographs, taken for any reason, were reviewed and a local registry of diagnoses was used to identify subsequent AVN.

RESULTS

229 of 586 children referred because of suspected NIH received early treatment (age ≤ 1 week) for NIH during the study period. 2 of the 229 treated children (0.9%, 95% CI: 0.1-3.1) had grade-1 AVN. Both had spontaneous resolution and were asymptomatic during the observation time (6 and 8 years). 466 children met the inclusion criteria for measurement of the ossific nucleus. Neonatally dislocated hips had significantly smaller ossific nuclei than neonatally stable hips: mean 9.4 mm (95% CI: 9.1-9.8) vs. 11.1 mm (95% CI: 10.9-11.3) at 1 year (p < 0.001).

INTERPRETATION

Early treatment with the von Rosen splint for NIH is safe regarding AVN. The ossification of the femoral head is slower in children with NIH than in untreated children with neonatally stable hips.

Developmental dysplasia of the hip: What has changed in the last 20 years?

Developmental dysplasia of the hip (DDH) describes the spectrum of structural abnormalities that involve the growing hip. Early diagnosis and treatment is critical to provide the best possible functional outcome. Persistence of hip dysplasia into adolescence and adulthood may result in abnormal gait, decreased strength and increased rate of degenerative hip and knee joint disease. Despite efforts to recognize and treat all cases of DDH soon after birth, diagnosis is delayed in some children, and outcomes deteriorate with increasing delay of presentation. Different screening programs for DDH were implicated. The suspicion is raised based on a physical examination soon after birth. Radiography and ultrasonography are used to confirm the diagnosis. The role of other imaging modalities, such as magnetic resonance imaging, is still undetermined; however, extensive research is underway on this subject. Treatment depends on the age of the patient and the reducibility of the hip joint. At an early age and up to 6 mo, the main treatment is an abduction brace like the Pavlik harness. If this fails, closed reduction and spica casting is usually done. After the age of 18 mo, treatment usually consists of open reduction and hip reconstruction surgery. Various treatment protocols have been proposed. We summarize the current practice for detection and treatment of DDH, emphasizing updates in screening and treatment during the last two decades.

Developmental Dislocation of the Hip Successfully Treated by Preoperative Traction and Medial Open Reduction: A 22-year Mean Followup

BACKGROUND

During the last 35 years, the medial approach has been reported more frequently than the anterior approach for open reduction of developmental dislocation of the hip (DDH), however, few studies have followed children treated by medial open reduction to adulthood.

QUESTIONS/PURPOSES

The purposes of our study were: (1) to assess the development of 71 completely dislocated hips after medial open reduction, the incidence of additional surgery and avascular necrosis during the followup period, and the long-term radiographic and functional results; and (2) to compare our results with those obtained by others who performed open reduction either by the medial or anterior approach.

PATIENTS AND METHODS

We retrospectively evaluated, after the end of growth, 71 hips in 52 patients who underwent open reduction by the medial approach. The mean age of the patients was 16 months (range, 3-36 months). After surgery, the hips were immobilized in 100° flexion, 60° abduction, and neutral rotation for an average of 6 months. All patients had staged clinical and radiographic followups until skeletal maturity. The length of followup averaged 22 years (range, 13-32 years).

RESULTS

In all the surgically treated hips, the acetabular index normalized by the end of growth, the incidence of avascular necrosis was 18%, and additional surgery was required in 15% of our cases. At the last followup, 93% of the hips were classified as Severin Classes I or II and 7% as Class III; 76% of the hips had an excellent result, 17% had a good result, and 7% had a fair result according to the McKay scale as modified by Barrett and colleagues.

CONCLUSIONS

Open reduction of DDH through a medial approach provided good long-term radiographic and functional results in patients 3 to 36 months old and it was the only surgery performed in 85% of our cases. Future comparative studies are needed to confirm our results, especially in older children.

LEVEL OF EVIDENCE

Level IV, therapeutic study.

A novel surgical approach for the treatment of tumors in the lesser trochanter

The proximal femur is a common location for the development of primary benign bone tumors. However, there is currently no surgical technique designed specifically for treating tumors located in the lesser trochanter. In the present study, a novel procedure was developed for directly exposing the lesser trochanter for surgical intervention. This technique may be particularly suited to treating tumors that extend toward the lateral and anterior forward of the lesser trochanter. The new approach involved passing through the femoral triangle, separating the femoral nerve and femoral vessels (artery and vein) and resecting the tumor between the iliopsoas and pectineal muscles. The procedure was performed on six patients with various types of tumor, including one case with osteoid osteoma, one case with non-osteogenic fibroma, one case with osteoma, one case with liposarcoma and two cases of osteochondroma. The preliminary results indicated that the surgical durations were short (60-100 min), blood loss was minimal (30-200 ml) and that pain relief was achieved following surgery. Only one patient continued to experience mild pain, scoring 18 mm on a visual analog scale. The other patients were fully relieved of pain. Sensory dysfunction was experienced by one patient following surgery, with persistent numbness and paresthesias in the distribution of the femoral nerve. No cases of deep vein thrombosis, femur head necrosis, hip joint degeneration disease or local recurrence were identified in any patients during the follow-up period. In order to clarify the virtual tissue, such vessels, nerves and the available space in our approach area, we collected 20 cadaveric specimens and performed anatomical examinations in and around the formal triangle. The spaces between the femoral artery and femoral nerve were measured and analyzed, with the results demonstrating that a definite space existed. Therefore, the novel approach presented in the study may be useful in the resection of benign tumors and the preoperative palliative resection of malignant tumors. The technique may be particularly suited to tumors extending toward the lateral and anterior of the lesser trochanter.

A modified surgical approach of the hip in children: is it safe and reliable in patients with developmental hip dysplasia?

PURPOSE

Treatment is easier and complications are less likely to occur if developmental dysplasia of the hip (DDH) is diagnosed early. In this study, we examined the early results of open reduction using a medial approach which we had modified for DDH and analyzed the success of this technique and the associated complication rates, with a focus on avascular necrosis (AVN).

METHODS

This is an Institutional Review Board-approved retrospective review of all patients diagnosed with DDH and treated with a modified medial approach at a single institution from July 1999 to December 2010. The patients' charts were analyzed for clinical and radiographic features.

RESULTS

Fifty-five hips of 41 patients, all of whom were treated by open reduction using a modified medial approach due to DDH, were evaluated retrospectively. The mean age of the patients at surgery was 19 (range 11-28) months, and the average follow-up was 5.5 (range 3-9.5) years. AVN was the most important complication in terms of radiological outcomes as assessed according to the Kalamchi-McEwen classification. Radiologic results were excellent or good in 51 hips (92.7 %) and fair-plus in four (7.3 %). Type 1 temporary AVN was detected in only two hips (3.6 %), and the lesions had disappeared completely in the final control graphs of these two patients. A secondary intervention was needed for two hips (3.6 %) of the same patients who were operated on due to bilateral DDH. No other complications, such as infection, re-dislocation, or subluxation, were seen in the operated patients.

CONCLUSIONS

We believe that treatment for DDH using a modified medial approach during early childhood is an effective and reliable method with low AVN rates. As shown here, this method achieves great success in radiological and clinical outcomes after a minimum 3-year follow-up.

The medial approach open reduction for developmental dysplasia of the hip: do the long-term outcomes validate this approach? A systematic review of the literature

INTRODUCTION

Developmental dysplasia of the hip (DDH) is one of the most commonly diagnosed and treated paediatric orthopaedic conditions.

OBJECTIVE

To systematically identify, appraise and synthesise the best evidence for the long-term outcomes of the medial approach open reduction (MAOR) for DDH.

METHODS

MEDLINE, EMBASE and the Cochrane databases were searched up to July 2013. All study designs that reported on the long-term outcomes of the MAOR as the primary treatment modality for DDH were included. The risk of bias in each study was evaluated using the Cochrane risk of bias assessment tool with some modification to accommodate different study designs.

RESULTS

From the 162 citations screened, five retrospective observational studies that fulfilled the eligibility criteria were included. The mean age at surgery varied from 10 to 17 months with an average follow-up period of 16-25 years. Acetabular development, as defined by the Severin Classification, was reported as satisfactory (Severin I/II) in between 38 and 79 % of study cohorts. However these good and excellent outcomes were less promising when patients who had additional operations were considered as unsatisfactory results. Avascular necrosis, as predominantly defined by the Kalamchi criteria, varied from 5 to 43 %. Negative prognostic factors implicated were mean age at surgery >17 months, the absence of the ossific nucleus and eccentric posturing of the femoral head postoperatively. The rate of secondary operations reported varied from 11 to 50 %. There were no reported total hip replacements.

CONCLUSION

There is a paucity of robust evidence pertaining to the long-term outcomes of the MAOR for developmental dysplasia of the hip. The trends from observational studies suggest that the long-term outcomes are not as positive as short- to intermediate-term studies suggest. Further prospective, controlled and rigorously designed studies are required to validate this approach.

Minimally invasive medial hip approach

The medial approach to the hip via the adductors, as described by Ludloff or Ferguson, provides restricted visualization and incurs a risk of neurovascular lesion. We describe a minimally invasive medial hip approach providing broader exposure of extra- and intra-articular elements in a space free of neurovascular structures. With the lower limb in a "frog-leg" position, the skin incision follows the adductor longus for 6cm and then the aponeurosis is incised. A slide plane between all the adductors and the aponeurosis is easily released by blunt dissection, with no interposed neurovascular elements. This gives access to the lesser trochanter, psoas tendon and inferior sides of the femoral neck and head, anterior wall of the acetabulum and labrum. We report a series of 56 cases, with no major complications: this approach allows treatment of iliopsoas muscle lesions and resection or filling of benign tumors of the cervical region and enables intra-articular surgery (arthrolysis, resection of osteophytes or foreign bodies, labral suture).

Anatomical basis for surgical approaches to the hip

The hip joint is one of the most surgically exposed joints in the body. The indications for surgical exposure are numerous ranging from simple procedures such as arthrotomy for joint drainage in infection to complex procedures like revised total hip replacement. Tissue dissections based on sound knowledge of anatomic orientations is essential for best surgical outcomes. In this review, the anatomical basis for the various approaches to the hip is presented. Systematic review of the literature was done by using PubMed, Cochrane, Embase, OVID, and Google databases. Out of the initial 150 articles selected from the the review and selection criteria, only 37 that suited the study were eventually used. Selected articles included case reports, clinical trials, review and research reports. Each of these approaches has various modifications that seek to correct certain difficulties or problems encountered with previous descriptions. An ideal approach for a procedure should be safe and provide satisfactory exposure of the joint. It should avoid bone and soft tissue damage as well as avoid unnecessary devascularization. Among the factors that determine the choice of surgical approach to the hip are the indication for the procedure; the influence of previous surgical incisions as well as the personal preferences and training of the operating surgeon.

Evidence-based management of developmental dysplasia of the hip

Developmental Dysplasia of the Hip (DDH) refers to a spectrum of abnormalities involving the developing hip. These abnormalities range from mild instability to frank dislocation of the joint. It is important to treat the condition effectively in order to encourage the hip to develop normally and produce good long-term results. This article reviews the evidence related to the treatment of DDH. The quality of evidence for DDH management remains low, with little uniformity in terminology and most studies being retrospective in nature. Given this, it is not possible to recommend or reject most treatment modalities based on existing studies.

A long-term follow-up study of open reduction using Ludloff's approach for congenital or developmental dislocation of the hip

Objectives

There are several reports clarifying successful results following open reduction using Ludloff’s medial approach for congenital (CDH) or developmental dislocation of the hip (DDH). This study aimed to reveal the long-term post-operative course until the period of hip-joint maturity after the conventional surgical treatments.

Methods

A long-term follow-up beyond the age of hip-joint maturity was performed for 115 hips in 103 patients who underwent open reduction using Ludloff’s medial approach in our hospital. The mean age at surgery was 8.5 months (2 to 26) and the mean follow-up was 20.3 years (15 to 28). The radiological condition at full growth of the hip joint was evaluated by Severin’s classification.

Results

All 115 hips successfully attained reduction after surgery; however, 74 hips (64.3%) required corrective surgery at a mean age of 2.6 years (one to six). According to Severin’s classification, 69 hips (60.0%) were classified as group I or II, which were considered to represent acceptable results. A total of 39 hips (33.9%) were group III and the remaining seven hips (6.1%) group IV. As to re-operation, 20 of 21 patients who underwent surgical reduction after 12 months of age required additional corrective surgeries during the growth period as the hip joint tended to subluxate gradually.

Conclusion

Open reduction using Ludloff’s medial approach accomplished successful joint reduction for persistent CDH or DDH, but this surgical treatment was only appropriate before the ambulating stage.

Cite this article: Bone Joint Res 2014;3:1–6.

Management of developmental dysplasia of the hip in less than 24 months old children

BACKGROUND

There is no consensus on the treatment of developmental dysplasia of the hip in children less than 24 months of age. The aim of this study was to present the results of open reduction and concomitant primary soft-tissue intervention in patients with developmental dysplasia of the hip in children less than 24 months of age.

MATERIALS AND METHODS

Sixty hips of 50 patients (4 male, 46 female) with mean age of 14.62 ± 5.88 (range 5-24 months) months with a mean followup of 40.00 ± 6.22 (range 24-58 months) months were included. Twenty five right and 35 left hips (10 bilaterally involved) were operated. Open reduction was performed using the medial approach in patients aged < 20 months (with Tönnis type II-III and IV hip dysplasias) and for those aged 20-24 months with Tönnis type II and III hip dysplasias (n = 47). However for 13 patients aged 20-24 months with Tönnis type IV hip dysplasias, anterior bikini incision was used.

RESULTS

Mean acetabular index was 41.03 ± 3.78° (range 34°-50°) in the preoperative period and 22.98 ± 3.01° (range 15°-32°) at the final visits. Mean center-edge angle at the final visits was 22.85 ± 3.35° (18°-32°). Based on Severin radiological classification, 29 (48.3%) were type I (very good), 25 (41.7%) were type II (good) and 6 (10%) were type III (fair) hips. According to the McKay clinical classification, postoperatively the hips were evaluated as excellent (n = 42; 70%), good (n = 14; 23.3%) and fair (n = 4; 6.7%). Reduction of all hip dislocations was achieved. Additional pelvic osteotomies were performed in 14 (23.3%) hips for continued acetabular dysplasia and recurrent subluxation. (Salter [n = 12]/Pemberton [n = 2] osteotomy was performed). Avascular necrosis (AVN) developed in 7 (11.7%) hips.

CONCLUSION

In DDH only soft-tissue procedures are not enough, because of the high rate of the secondary surgery and AVN for all cases aged less than 24 months. Bone procedures may be necessary in the walking age group with high acetabular index.

Long-term outcome of Ludloff's medial approach for open reduction of developmental dislocation of the hip in relation to the age at operation

We reviewed long-term outcomes after open reduction by the medial approach for developmental dislocation of the hip (DDH). Forty-five hips in 43 patients with more than ten years of follow-up were assessed clinically and radiologically. The mean age at surgery was 14.0 (range 6-31) months, and the follow-up period ranged from ten to 28 years (mean 16.4 years). We compared the good (18 hips) and poor groups (27 hips) as classified by the Severin classification. The mean age at surgery was significantly older in the poor group than the good group (17.1 and 9.4 months, respectively, P < 0.001). Thirteen (29%) of 45 hips had avascular necrosis (AVN) of the femoral head. The mean age at surgery was significantly older in the patients with AVN than without AVN (20.0 and 11.6 months, respectively, P < 0.001). Another approach, such as the wide exposure method, should be selected for DDH with increased age at operation.

Femoral head deformity after open reduction by Ludloff's medial approach

Ludloff's medial approach has been described as a simple procedure for open reduction of developmental dysplasia of the hip (DDH) requiring minimal dissection and tissue disruption. Many patients undergo subsequent reconstruction of the acetabulum after skeletal maturity for residual dysplasia. Femoral head deformity reportedly influences the long-term outcome of these osteotomies. The literature suggests this deformity may be related to the patient's age at the time of a medial approach. We therefore asked whether femoral head deformity (roundness index, femoral head enlargement) at skeletal maturity correlates with patient age at surgery. We assessed the radiographs of 40 patients (42 hips). Their mean age at surgery was 14.3 months (range, 6-31 months); the minimum followup was 10 years (mean, 15.8 years; range, 10-27 years). The mean roundness index at skeletal maturity correlated with increased age at the time of the operation (mean index, 58.3; range, 47-79) while enlargement did not. Using a medial approach for correction of DDH in older patients increases the risk of femoral head deformity at skeletal maturity.

Long-term results after two-stage operative treatment of late developmental displacement of the hip

The purpose of this study was to evaluate the long-term results of 43 patients who underwent two-stage operative treatment of late developmental displacement of the hip (LDH). The average age at the time of open reduction was 20.7 months. An intertrochanteric osteotomy was performed after an average of 6.7 weeks. The mean clinical and radiological follow-up was 32.75 years. Degenerative changes were documented according to Kellgren. For assessment of outcome we used Severin's classification and score according to Merle d'Aubigné. One patient required a total hip replacement. Complications included one superficial infection and three recurrent dislocations. One patient developed coxa magna and two additional avascular necrosis of the hip. The score according to Merle d'Aubigné was 16.1. At the latest follow-up 35 hips had degenerative changes grade 0 or 1 and 7 grade 2. Using the Severin classification 13 hips had a satisfactory result (class I), 14 were rated as class II, 7 as class III, 5 as class IV and 2 as class V. The two-stage procedure seems to be a successful principle in the operative treatment of LDH.

Late-presenting developmental dysplasia of the hip treated with the modified Hoffmann-Daimler functional method

BACKGROUND

The general consensus is that nonoperative treatment of developmental dysplasia of the hip should not be attempted for patients in whom previous treatment of the disease has failed, those in whom the disease was neglected, or those in whom the disease presented late. In such cases, it is believed that the optimum period for hip remodeling has passed and that operative methods are preferable. The purpose of the present study was to report the efficacy of a modified form of the Hoffmann-Daimler method for the treatment of late-presenting developmental dysplasia of the hip.

MATERIALS

We retrospectively reviewed the records of sixty-nine patients (ninety-five hips) with neglected developmental dysplasia of the hip who had been managed nonoperatively with a modification of the Hoffmann-Daimler method from 1971 to 2000. With this method, the patient wears a flexion harness (Phase A), during which time the femoral head is gradually reduced, followed by an abduction splint (Phase B), during which time the reduced hip remodels. We have modified the original method by introducing new treatment strategies. The study group included nine boys and sixty girls. The average age of the patients was sixteen months (range, six to forty-four months) at the start of treatment and 11.5 years (range, six to twenty-nine years) at the time of the latest follow-up. Radiographs were assessed to determine the acetabular index, the Severin classification, and the presence of evidence of osteonecrosis of the proximal femoral epiphysis. Hips that were rated as Severin class I or class II were classified as satisfactory, whereas those that were rated as Severin class III or class IV were classified as unsatisfactory.

RESULTS

On the basis of the most recent follow-up radiographs, eighty-eight (93%) of the dislocated hips were classified as satisfactory (sixty-seven were rated as Severin class I and twenty-one were rated as Severin class II) and seven were classified as unsatisfactory (six were rated as Severin class III and one was rated as Severin class IV). No hip was rated as Severin class V or VI. The average acetabular index was 40 degrees +/- 7.4 degrees prior to the onset of treatment and 24 degrees +/- 5.7 degrees at the end of treatment. No redislocations or other complications were noted. Osteonecrosis was noted in six of the ninety-five hips.

CONCLUSIONS

Late-presenting or neglected developmental dysplasia of the hip can be successfully treated with use of a modified Hoffmann-Daimler method. The high rate of successful reduction, the low prevalence of osteonecrosis and residual dysplasia, and the limited complications may make this modified method a safe alternative to surgical treatment.

LEVEL OF EVIDENCE

Therapeutic Level IV.

Is concomitant bone surgery necessary at the time of open reduction in developmental dislocation of the hip in children 12-18 months old? Comparison of open reduction in patients younger than 12 months old and those 12-18 months old

It is controversial to perform bone surgery at the time of open reduction in developmental dislocation of the hip in children 12-18 months old. The purpose of this study is to investigate whether concomitant bone surgery is necessary in patients treated with medial open reduction in this age range. Patients that were under 12 months of age at the time of open reduction were compared with patients that were 12-18 months old. Forty-four hips of 30 patients treated with open reduction through Ferguson's medial approach have been included in the study. Mean follow-up was 19.6 years (13-27.5). Age at the time of open reduction was less than 12 months in 21 hips (group A) and 12 months or more in 23 hips (group B). There was no significant difference between two groups concerning avascular necrosis or unsatisfactory radiological outcome (Severin's groups III and IV). A higher rate of secondary bone surgery was necessary in group B than in group A. Although secondary bone surgery is needed at a higher frequency in children 12-18 months old, the radiological outcome is not significantly different for patients younger than 12 months. Therefore, the recommendation of concomitant bone surgery on a routine basis during open reduction in developmental dislocation of the hip in children 12-18 months old is debatable.

Simultaneous open reduction and Dega transiliac osteotomy for developmental dislocation of the hip in children under 24 months of age

The authors studied retrospectively 33 hips in 26 children at an average of 9 years 5 months after simultaneous open reduction and Dega transiliac osteotomy for developmental dislocation of the hip (DDH). All children were younger than 2 years of life at surgery. At the latest follow-up 89% of the clinical results and 72% of the radiographic results were rated excellent or good, despite a 45% rate of avascular necrosis observed before surgery. The authors attempted to identify factors influencing the final result. Given the low complication rate (3%) and low reoperation rate (3%), the authors conclude that the reviewed surgical protocol is safe and efficient in the treatment of DDH in young children.

Arthroscopic-assisted surgical treatment for developmental dislocation of the hip

PURPOSE

Treatment of developmental dislocation of the hip (DDH) includes surgical management in older children or in those who cannot be treated conservatively. However, complication rates of surgical treatment are quite high. The purpose of this report is to introduce our new surgical technique that can eliminate existing pathologic changes in DDH.

TYPE OF STUDY

A small case series.

METHODS

We performed arthroscopic-assisted surgical treatment in 4 hips of 4 female children who had DDH and no previous treatment. Their ages ranged from 11 to 14 months. Closed reduction under general anesthesia was tried just before the surgical intervention, but it failed in all of them. Tightness of the iliopsoas tendon was released followed by dissection of capsular adhesions using an anterolateral mini-incision. Excision of the hypertrophic ligamentum teres, transverse acetabular ligament, and pulvinar tissue was carried out using a double-portal arthroscopic procedure. We performed percutaneus adductor tenotomies in 2 cases. A spica cast and abduction splint were used for 12 to 17 weeks postoperatively. The follow-up of the patients was a minimum of 1 year. Although a 1-year follow-up period is adequate to evaluate the short-term results, it has been considered that there is a need for further studies that include long-term follow-up. We used the acetabular index and Shenton's line for preoperative and postoperative radiologic evaluation. Also, the cases were evaluated postoperatively in respect to range of motion restriction and the leg length discrepancy.

RESULTS

The mean follow-up was 13.7 months (range, 12 to 16 months). Acetabular index measurements of the cases in the preoperative/postoperative periods were as follows: in the first case, 34 degrees/27 degrees; in the second case, 35 degrees/22 degrees; in the third case, 52 degrees/39 degrees; and in the fourth case, 40 degrees/28 degrees. Hip joint restriction and leg length discrepancy were not observed postoperatively.

CONCLUSIONS

All the intra-articular structures (hypertrophic ligamentum teres, transverse acetabular ligament, and pulvinar tissue) in the acetabulum that impede the reduction of the femoral head have been eliminated by using the arthroscopic technique. The arthroscopic-assisted surgical treatment of DDH is successful in the short-term follow-up period.

LEVEL OF EVIDENCE

Level IV, Case Series.

Long-term results after open reduction of developmental hip dislocation by an anterior approach lateral and medial of the iliopsoas muscle

The technique of and especially the approach to open reduction of developmental dislocation of the hip are still a matter of discussion. The anterior approach, first lateral and then medial to the iliopsoas muscle, was described by Tonnis in 1978. A follow-up investigation to adulthood has now been performed. Eighty-seven children (118 hips) out of 105 children (83%) who underwent open reduction of developmental dislocation of the hip before the age of 4 years were reinvestigated 10-21 years after the operation. An anterior approach first lateral, then medial to the iliopsoas muscle was chosen, because this offers the best access to the joint. Additional operations including transiliac osteotomy for acetabuloplasty, shortening osteotomy, and femoral osteotomies were performed as necessary. In 92 (78%) of the 118 hips studied the CE angle exceeded 25 degrees and in 98 hips (83%) the VCA angle exceeded 25 degrees. Critical CE angles between 20 and 25 degrees were found in 14% of the hips, and critical VCA angles in 4%. Residual dysplasia (<20 degrees) was found in 8 and 13% of the hips, respectively. Avascular necrosis according to Hirohashi was observed after operation in grade 1 in 5.9% and grade 2 in 1.7%. No necrosis was found following shortening osteotomy of the proximal femur. The anterior approach, first lateral, then medial to the iliopsoas muscle, offers an optimal access to the medial parts of the joint with control of reduction, protects the vasculature of the femoral neck, and allows simultaneous postero-lateral capsulorrhaphy and pelvic osteotomies.

Open reduction through a medial approach in developmental dislocation of the hip: a follow-up study to skeletal maturity

Forty-four developmentally dislocated hips occurring in 30 patients with an average age at initial surgery of 10.7 (range 2-19) months underwent medial open reduction by Ferguson's approach. All patients were skeletally mature at most recent evaluation. Mean follow-up was 19.8 (range 13-27.5) years. No redislocation or sub-luxation occurred. Additional surgery was required in 11 hips (25%). Avascular necrosis was detected in nine hips (20%). The acetabular index was decreased and the center-edge angle was increased during follow-up. Excellent or good outcome (Severin group 1 or 2) was observed in 79% of the hips at skeletal maturity. At the most recent evaluation, all but two patients had the highest score on the Iowa Hip Rating. The authors conclude that open reduction through the medial approach is effective in developmental dislocation of the hip. Follow-up until skeletal maturity is necessary for an accurate assessment of treatment.

Avascular necrosis after surgical treatment for development dysplasia of the hip

We reviewed the medical records of 101 patients with developmental dysplasia of the hip who were treated with Dega's (102 hips), or Salter's (42 hips)osteotomy preceded by open reduction and femoral intertrochanteric osteotomy. The minimal follow-up was 17 years. At the last follow-up, there were proximal fem-oral growth disturbances in 52 hips (36%). In 20 hips, the disturbances were graded as mild and in six as severe. We found significantly better clinical and radiological results in hips without avascular changes. Risk factors for the development of avascular necrosis were: involvement of the left side and surgical treatment initiated after 2 years of age without pre-operative traction and without femoral shaft shortening. We found that the incidence of avascular necrosis increased with the length of follow-up. The avascular necrosis influenced both clinical and radiological results.

Failures of open reduction in developmental dislocation of the hip

Eight patients with the same number of developmental dislocated hips were initially treated with open reduction through an anterolateral approach. The hips then became dislocated again. There were six girls, with a mean age at first open reduction of 13.3 months. We treated the hips with a new open reduction through an anteromedial approach. A constricted anteromedial capsule was always found as the main factor; all had an intact anteromedial capsule, there was an inverted transverse ligament in three cases and a very tight psoas tendon in another three cases. All were reduced, without complications and with only one simultaneous bone procedure. Risk of avascular necrosis and residual dysplasia could not be evaluated with this follow-up. We conclude that in any open reduction for developmental dislocation of the hip the surgeon must consider a release of the anteromedial capsule, which we have found to be the most important factor in technical failures.

Open reduction for congenital dislocation of the hip: comparison of the long-term results of the wide exposure method and Ludloff's method

We compared the long-term clinical and radiographic results of two methods of open reduction for congenital dislocation of the hip; a wide exposure method (360-degree circumferential capsulotomy) versus Ludloff's method (limited capsulotomy via the medial approach). Thirty-one hips in 24 patients assigned to group A received the wide exposure method and 32 hips in 27 patients assigned to group B had the Ludloff reduction. All patients were surgically reduced at less than 3 years of age. The follow-up averaged 16 years. None of the hips in group A required additional operations; however, 34.4% of the hips in group B did. At the latest review, 26 (83.9%) of the hips in group A were rated as Severin class I or II. Except for one patient, none had pain or a limp. Of the hips in group B, 18 (56.3%) were rated as Severin class I or II. Three patients had pain or Trendelenburg gait. Avascular necrosis occurred in 3.2% of hips in group A and in 21.9% of hips in group B. The wide exposure method is capable of completely releasing the posterosuperior tightness resulting from capsular adhesion to the ilium and the contracted short external rotators. Releasing the posterosuperior tightness from these structures seemed to provide a better chance of achieving an anatomically and functionally satisfactory hip.

Open reduction and varus-detorsion osteotomy with femoral shortening in treatment of congenital dislocation of the hip

In this study, we clinically and radiographically evaluated open reduction with shortening of the femur in children more than 1 year old with refractory congenital dislocation of the hip. In 19 children (aged 1-4 years), 22 joints were operated on. The patients were followed-up for an average of 8.7 years (range, 2-13 years). Functional results were satisfactory in all joints, and differences in limb length were not significant. Radiographically, good results (grades I and II) were obtained in 16 of the 22 joints, according to Severin's criteria. This surgical procedure may be indispensable for treating refractory congenital dislocation of the hip in children over 1 year old.

Long-term outcome after open reduction through an anteromedial approach for congenital dislocation of the hip

We reviewed the long-term outcome of open reduction of ninety-three congenitally dislocated hips (in seventy-six children) through an anteromedial approach. The average age of the patients was fourteen months (range, two to fifty months) at the time of the reduction and eleven years (range, four to twenty-three years) at the time of the most recent follow-up evaluation. At the most recent follow-up evaluation, sixty-six hips (71 per cent) had an excellent or good result, twenty-four (26 per cent) had a fair result, and three (3 per cent) had a poor result, according to the Severin classification system. An inverted neolimbus at the time of the operation and postoperative growth disturbance of the femoral head were associated with a poor roentgenographic result. According to the classification of Bucholz and Ogden, twenty-two hips (24 per cent) had type-II avascular necrosis, thirteen hips (14 per cent) had type-III, three (3 per cent) had type-IV, two (2 per cent) had non-classifiable lesions, and fifty-three (57 per cent) did not have avascular necrosis. A high hip dislocation and an operation after the age of twenty-four months were associated with a higher rate of growth disturbances of the femoral head. With the numbers available for study, we did not find any association between short-term preoperative traction, ligation of the medial circumflex vessel, or the type of neolimbus and the prevalence of growth disturbances. Two hips redislocated postoperatively, and seven had transient stiffness. We consider the anteromedial approach to be useful in the management of patients with congenital dislocation of the hip who are twenty-four months old or less. The advantages of this approach include direct access to the obstacles to reduction, avoidance of damage of the iliac apophysis and the abductor muscles, minimum blood loss, the need for only a single operative session for treatment of both hips, and a cosmetically acceptable scar. The prevalence of type-II growth disturbances of the femoral head was higher than had been expected, emphasizing the need for additional investigation.