Bernese-type triple pelvic osteotomy through a single incision in children over five years: a retrospective study of twenty eight cases

Factors influencing outcomes of pelvic osteotomy for residual acetabular dysplasia following closed reduction in patients with developmental dysplasia of the hip

To investigate the factors influencing outcome of pelvic osteotomy (PO) for residual acetabular dysplasia (RAD) following closed reduction (CR) in patients with developmental dysplasia of the hip (DDH). We retrospectively reviewed 91 patients (95 hips) with DDH who underwent PO for RAD. Tönnis grade, Acetabular index, Center Edge Angle, Reimer's Index (RI), and avascular necrosis of the femoral head (AVN) were assessed. Hips were divided into satisfactory (Severin I/II) and unsatisfactory group (Severin III/IV). Finally, 87 hips (91.5%) had satisfactory and 8 (8.5%) unsatisfactory outcomes. The RI before PO was significantly higher in unsatisfactory (49.6 ± 9%) than in satisfactory group (30.6%±11.8%). All patients without AVN had satisfactory outcome, while it was 78.9% of patients with AVN. Logistic regression analysis showed that higher AVN grade and RI before PO were risk factors for unsatisfactory outcome. Satisfactory outcome was obtained in all hips with RI < 33% before PO, while it was 79.5% if RI > 33% before PO (79.5%). There was no difference in the satisfactory rate between patients undergoing open reduction (66.7%) and those not undergoing (83.3%). The rate of satisfactory outcome in patients undergoing femoral osteotomy (63.6%) was lower than those without it (100%). In patients with RAD following CR, good outcome can be expected after PO alone. AVN and preoperative RI > 33% are risk factors for poor outcome. Additional open reduction and femoral osteotomy do not significantly improve outcome of PO in patients with preoperative RI > 33%.

Single Versus 3-incision Triple Pelvic Osteotomy: Comparison of Clinical and Radiologic Results

BACKGROUND

Triple pelvic osteotomy (TPO) is indicated when the anatomic and functional realignment of the hip joint is needed. Although the traditional approach for TPO involves a separate incision for ischial cut, there has been a trend for single-incision TPO in recent years. This study aims to compare the clinical and radiologic results of 2 different approaches.

METHODS

Forty-two hips of 39 patients treated using TPO with a minimum of 24 months of follow-up were included in our cohort. Demographics, perioperative, and radiologic parameters were evaluated. Harris Hip Score and International Hip Outcome Tool were used for clinical evaluation.

RESULTS

A single anterolateral incision approach was used in 18 hips (17 patients), whereas a 3-incision approach was used in 24 hips (22 patients). The mean follow-up was 4.7 years in the 3-incision group and 3.8 years in the single-incision group (P=0.43), with mean surgery age at 8.7 years (range, 5.4 to 12) for single-incision and 9.7 years (range, 7.7 to 11.7) for 3e-incision (P=0.22). There were no significant differences observed between the 2 groups concerning radiographic measurements, complications, and functional scores. The mean surgical time was 118.6 minutes in the single-incision group and 97.9 minutes in 3-incision group (P=0.036). Mean intraoperative blood loss was 181.7 ml in the single-incision group and 243.4 ml in 3-incision group (P=0.028). Three-incision group demonstrated significantly higher intraoperative blood loss, leading to lower hemoglobin values (P=0.042).

CONCLUSION

The single-incision TPO demonstrated similar outcomes compared with the traditional 3-incision approach in terms of radiologic correction and functional improvement. The single-incision technique exhibited advantages such as reduced intraoperative blood loss and potential benefit of decreased pain due to fewer scars. However, it required a longer surgical time compared with the 3-incision approach. Surgeons should consider patient-specific factors and their expertise when selecting the most appropriate approach for each case.

LEVEL OF EVIDENCE

Level III-retrospective comparative series.

The role of the cartilaginous to osseous acetabular angle ratio in children with developmental dysplasia of the hip

Purpose

This study aims to demonstrate the use of the cartilaginous to osseous acetabular angle ratio (AAR) in surgical decision-making for hip dysplasia.

Methods

Data were collected from patients who underwent an MRI of the hip after conservative treatment for developmental dysplasia of the hip between August 2019 and 2022. The data included demographic information as well as an anteroposterior pelvic radiograph. The osseous acetabular index (OAI) was measured using x-ray, while the cartilaginous acetabular index (CAI) and the cartilaginous acetabulum head index (CAHI) were measured using MRI. The square of the CAI to OAI, AAR, was calculated. The patients in the residual hip dysplasia (RHD) group were categorized as having an OAI above 20°. During the postoperative follow-up, we evaluated the patients in this group who underwent Bernese triple pelvic osteotomy. Data on surgical patients with an observation period that exceeded 1 year were collected and analyzed. The distribution of the AAR among the different groups was analyzed. A receiver operating characteristic (ROC) predictive model was constructed using the AAR of the patients in the normal and surgical groups to evaluate the need for surgery.

Results

It was found that there was a significant difference in the OAI, CAI, CAHI, and AAR between the RHD group (OAI 26.15 ± 3.90°, CAI 11.71 ± 4.70°, CAHI 79.75 ± 6.27%, and AAR 5.88 ± 4.24) and the control group patients (OAI 16.77 ± 5.39°, CAI 6.16 ± 3.13°, CAHI 85.05 ± 4.91%, and AAR 2.71 ± 2.08) (p < 0.001). A total of 93.5% of the control group patients had an AAR ≤5, while only 6.5% had an AAR >5. The results of postoperative imaging follow-up were "excellent" in 52 patients and "good" in 3, while the functional follow-up results were excellent in 53 and good in 2. In 15 patients, the observation period exceeded 1 year. The mean observation period was 633.1 ± 259.6 days and the preoperative CAHI was 71.7 ± 4.8%. Of the patients with an AAR >5, a substantial 94.8% (55/58) of them were reported to have undergone surgery, while all patients with an AAR less than or equal to 5 did not undergo surgery (91/91). Based on the ROC, a cutoff value of 5.09 was identified for the need for surgery in children with RHD.

Conclusions

A surgical decision for residual hip dysplasia can be based on the AAR. An AAR >5 may be a potential indicator for surgical intervention in patients with RHD.

Ultra-long-term results of the Chiari pelvic osteotomy in hip dysplasia patients: a minimum of thirty-five years follow-up

PURPOSE

The Chiari pelvic osteotomy was the first surgical procedure to address hip dysplasia by changing the position of the acetabulum by medialization, thus creating a bony roof and improving biomechanical conditions. The aim of this retrospective cohort study was to report on the very long-term results of this technique.

METHODS

Out of a consecutive series of 1536 hips, 504 in 405 patients were available for follow-up. The patients were assessed by physical and radiological examination. A Kaplan-Meier survival analysis with total hip arthroplasty as an endpoint was performed and stratified for age groups, pre-operative diagnosis, sex and osteoarthritis stage.

RESULTS

The average follow-up was 36 ± 8.1 years (range, 35.2 to 54). The average pain level on the Visual Analogue Scale was 2.9 ± 2.6 (range 0 to 8.7). The average Harris Hip Score was 80.2 ± 17.4 (range 17.4 to 100). Correction of dysplasia was effective and remained stable over time. Osteoarthritis significantly increased over time with 53% Tönnis grade 3 at follow-up. The cumulative survivorship was 79.8% (95% confidence interval (CI), 76.1-83.2%) at 20 years, 57.1% (95% CI, 52.8-61.8%) at 30 years and 35% (95% CI, 30.3-40.3%) at 40 years. Young age, male sex and low osteoarthritis grade were positive prognostic factors.

CONCLUSIONS

Although the Chiari pelvic osteotomy is considered a salvage procedure nowadays, it achieved excellent long-term results even in indications, which would be treated differently today. Young patients without osteoarthritis had the best outcome.

Some aspects of the choice of surgical approach for triple pelvic osteotomy in the treatment of hip dysplastic instability in children

Aim - on the basis of clinical and laboratory data, to analyze the degree of muscle injury during triple pelvic osteotomy with various approaches in patients with hip dysplasia Matherials and methods. The study included 70 patients aged 12 to 18 years with dysplasia Crowe I grade treated between 2020 and 2021. All children were divided into two groups - I - 35 patients who underwent triple pelvic osteotomy from an anterolateral approach, group II - 35 patients who underwent triple pelvic osteotomy from two approaches (medial and bikini"). In addition to standard radiometry of hip joints, such indicators as the severity of pain syndrome on the VAS scale were evaluated, as well as biochemical analysis of markers of muscle injury (LDH, CPK, creatinine, AST, C-reactive protein) before surgery and on the 3rd and 7th days after surgery. Results. The intensity of the pain syndrome according to the questionnaire data was more pronounced (p0.05) in patients who underwent surgery from an anterolateral access, and the values of CPK and C-reactive protein significantly (p0.05) exceeded those in patients who underwent triple pelvic osteotomy from two surgical approaches. The data obtained indicate greater surgical aggression against the muscles of the hip joint area during the anterolateral approch for triple pelvic osteotomy. Conslusion. A comparative analysis of the traumaticity of surgical approaches during triple pelvic osteotomy in children with hip dysplasia Crowe I degree, based on the assessment of biochemical indicators of markers of muscle injury and the intensity of pain syndrome in the postoperative period showed that the use of anteriorlateral approach significantly (p0.05) has a greater injury to muscle tissue than the use of two surgical accesses (medial and bikini), as evidenced by significant increases in CPK and CRP in the blood, as well as a more pronounced pain syndrome in the immediate postoperative period.

Tripleosteotomie bei Morbus Perthes

Operationsziel

Durch die Osteotomie des Ischium‑, Pubis- und Iliumknochens kann das Acetabulum über den Hüftkopf geschwenkt werden, sodass der meist anterolateral vorstehende Anteil des Hüftkopfes wieder überdacht wird. Das Ziel ist der Erhalt des Containments der Hüfte, hiermit ist die Wiederherstellung der Kongruenz zwischen dem lateralisierten Hüftkopf und dem Acetabulum gemeint. Das Acetabulum wirkt so als eine Art Schablone für den Hüftkopf, um eine möglichst sphärische Ausheilung des Hüftkopfes zu erreichen.

Indikationen

Schwere Morbus-Perthes-Erkrankung mit radiologisch sichtbarer Lateralisation des Hüftkopfes und Head-at-risk-Zeichen. Voraussetzung ist, dass der Hüftkopf sich konzentrisch reponieren lässt (Abduktionsaufnahme oder Arthrographie).

Kontraindikationen

„Hinged abduction“. Keine konzentrische Reposition des Hüftkopfes möglich.

Operationstechnik

Arthrographie des Hüftgelenkes zur Bestätigung der Operationsindikation. Darstellung und Osteotomie des Ischiums über einen modifizierten Ludloff-Zugang, Osteotomie des Iliums und Pubis über einen modifizierten Smith-Petersen-Zugang. Verbesserung der Hüftkopfüberdachung durch Schwenken des Acetabulums über den Hüftkopf. Fixation des azetabulären Fragmentes mit Vollgewinde-Kirschner-Drähten oder 3,5-mm-Kortikalisschrauben.

Weiterbehandlung

Mobilisation an Gehstöcken (kleine Kinder im Rollstuhl). Abstellen des Fußes erlaubt. Teilbelastung für 4 bis 6 Wochen (je nach Alter des Patienten). Danach bei im Röntgen guten Konsolidationszeichen Belastungsaufbau innerhalb 1 bis 2 Wochen.

Ergebnisse

Sehr gute Ergebnisse hinsichtlich Operationstechnik und Ausheilung in der eigenen Klinik. In einer eigenen noch nicht veröffentlichten Studie mit einem durchschnittlichen Untersuchungszeitraum von 5 Jahren zeigten sich bei 30 Patienten sehr gute klinische und radiologische Ergebnisse nach Tripleosteotomie bei Morbus Perthes.

Radiographic Outcomes of Ganz versus Modified Triple Osteotomies in Femoral Head Medialization and Coverage in Acetabular Dysplasia

Variable techniques in periacetabular osteotomy have been formulated for the treatment of acetabular dysplasia. However, few studies have compared the radiographic outcomes between different osteotomy types. This study compared modified triple innominate (MTI) osteotomy and Ganz osteotomy with respect to radiographic outcomes. Patients receiving MTI osteotomies and Ganz osteotomies at any time between 2006 and 2018 in a tertiary medical centre were recruited. Only patients with unilateral osteotomies were recruited to eliminate potential influence from the contralateral hip following periacetabular osteotomy. Patients having hip-joint dislocation, receiving simultaneous proximal femoral osteotomy, or having fewer than 2 years of follow-up were excluded. The radiographic parameters of preoperative and postoperative anteroposterior radiographs of the pelvis were measured, and Sharp’s angle (SA), the lateral centre-edge angle (CE angle), the femoral head extrusion index (FHEI), and the centre-head distance discrepancy (CHDD) were included for comparison. Among 55 participants, 23 received MTI osteotomies and 32 received Ganz osteotomies. The mean age at which patients underwent surgery was 21.9 years in the Ganz osteotomy group and 21.1 years in the MTI group. The mean follow-up length was 2.5 years. The preoperative radiographic parameters between groups differed only slightly and nonsignificantly. Both groups exhibited significantly improved SA, LCEA, and FHEI after surgery. The Ganz osteotomy group exhibited more favourable postoperative FHEI (13.5 vs. 24.3, p < 0.0001), CHDD (3.7 vs. 11.5, p < 0.0001), Sharp angle (45.0 vs. 41.8, p = 0.0489) and CE angles (28.3 vs. 21.1, p = 0.029) compared with the MTI osteotomy group. Notably, CHDD became better and worse following Ganz and MTI osteotomies, respectively; this suggests that the femoral head is pushed laterally in modified triple osteotomy. With respect to femoral head coverage and the medialization of the femoral head, Ganz osteotomy exhibits more favourable corrections in postoperative radiographic parameters than does MTI osteotomy.

Novel Minimally-Invasive Triple Pelvic Osteotomy: JiShuiTan Minimally-Invasive Approach

PURPOSE

Triple pelvic osteotomy (TPO) is often performed to improve femoral head coverage, correct deformity, and stabilize the hip joint in a variety of pediatric orthopaedic conditions. After the TPO was first reported, many modifications were developed to simplify or improve the procedure, however, because of the specific anatomy with several critical nerves and vessels passing through the approaches, extensive exposure and prolonged intraoperative fluoroscopy are often required for TPO. This report introduces a novel, minimally-invasive surgical approach that minimizes the time of intraoperative fluoroscopy and size of the surgical incision, and reviews our experience.

METHODS

A total of 48 hips in 43 patients with a mean age of 8.3±1.7 years (range: 6.0 to 12.2 y) were included in this study. Of these, 21 patients (22 hips) had Legg-Calvé-Perthes disease (LCPD) and 22 patients (26 hips) had developmental dysplasia of the hip (DDH). The TPOs were performed using the novel, minimally-invasive TPO approach, with a mean postoperative follow-up of 38 months (range: 24 to 54 mo) in the DDH group and 44 months (range: 23 to 58 mo) in the LCPD group. The acetabular index (AI), femoral head migration rate (MP), center edge angle (CEA) and the Severin and Stulberg classification systems were used to evaluate the preoperative and postoperative results. SPSS software was used to analyze the data.

RESULTS

The AI decreased from 33.8 degrees±9.2 to 2.9 degrees±10.1, the lateral CEA increased from -10.8 degrees±23.8 to 34.1 degrees±9.9, and the femoral head MP decreased from 64.0%±19.8% to 1.1%±2.6% in the DDH group at last follow-up, indicating significant improvement. The AI decreased from 20.8 degrees±4.7 to -1.3 degrees±7.3, the lateral CEA increased from 6.8 degrees±11.5 to 42.3 degrees±6.4, and the femoral head MP decreased from 42.2%±13.0% to 1.3%±3.3% in the LCPD group at last follow-up, also indicating significant improvement.

CONCLUSION

This approach can simplify the TPO, making the complex operation safer, more effective, and capable of achieving satisfactory correction.

Single-incision Extraperiosteal Triple Innominate Osteotomy: Outcomes of an Updated Technique

BACKGROUND

Since its original description, the triple pelvic osteotomy has undergone several modifications and refinements most often utilizing 3 or 2 incisions. Recently, a single-incision extraperiosteal technique has been described; however, little data exist on the outcomes of this procedure.

METHODS

All patients undergoing single-incision triple osteotomy from 2 centers were retrospectively reviewed. Demographic data, underlying diagnosis, and preoperative radiographic data were recorded. Intraoperative details including estimated blood loss and type of postoperative immobilization were noted. Over the follow-up period, complications were recorded as were radiographic outcomes including lateral center edge angle, acetabular index, migration percentage, continuity of Shenton's line, and time to union.

RESULTS

Twenty-eight hips (in 24 patients) underwent surgery at a mean age of 9.3 years (range, 6.5 to 13.8 y). Diagnoses included Trisomy 21 (9), developmental dysplasia of the hip (5), Charcot-Marie-Tooth (3), and neuromuscular disease (9) among others. The mean estimated blood loss was 135 mL (±98 mL) and most patients were immobilized in an abduction brace or single-leg spica cast for an average of 7.6±2.2 weeks after surgery before weight-bearing was advanced. At a mean follow-up of 3.0±2.2 years, the lateral center edge angle improved from an average of 1±14 degrees preoperatively to 35±7 degrees, the acetabular index from 27±11 degrees to 2±5 degrees, and the migration percentage from 44%±21% to 3%±5%. Fourteen hips had frank instability before surgery and 20 had a break in Shenton's line >5 mm. At most recent follow-up, all but 1 hip was stable (93%) and all had restoration of Shenton's line (100%). Radiographic union occurred at a mean of 14 weeks (±11 wk). One patient developed an ischial nonunion that underwent further surgery, 1 had premature closure of the triradiate cartilage, and 1 patient with transverse myelitis developed Charcot arthropathy. There were no other complications in this series.

CONCLUSIONS

In this dual-center retrospective series, the single-incision triple innominate osteotomy was extremely effective for improving acetabular coverage and stabilizing unstable hips in a variety of underlying diagnoses with an acceptably low rate of complications.

LEVEL OF EVIDENCE

Level IV-case series.

Risk factors associated with unsatisfactory hip function in children with late-diagnosed developmental dislocation of the hip treated by open reduction

BACKGROUND

Open reduction with or without pelvic and femoral osteotomy is the accepted treatment option for children older than 18 months with developmental dislocation of the hip (DDH). However, few studies have investigated hip function in children with late DDH treated by open reduction. Therefore, we performed a retrospective study investigating the risk factors potentially associated with unsatisfactory hip function.

HYPOTHESIS

We hypothesized that some risk factors can be associated with unsatisfactory hip function in patients with late DDH treated by open reduction.

PATIENTS AND METHODS

We retrospectively reviewed the clinical and radiographic data of 79 children (98 hips, mean age 39.7±18.6 months; range, 19-95.3) with late-detected DDH treated by open reduction. Acetabular index (AI), Tönnis grade, Center Edge Angle (CEA), avascular necrosis of the femoral epiphysis (AVN), and Severin radiographic grade were evaluated on radiographs. Hip function was rated according to modified Outcome Evaluation Standard for Congenital Dislocation of the Hip with a maximum score of 15. According to type of surgery, patients were divided into four groups: open reduction alone (Group A), open reduction in conjunction with pelvic osteotomy (Group B), and open reduction in conjunction with femoral osteotomy and Pemberton/Salter (Group C) or Bernese-type triple pelvic osteotomy (Group D). Analysis of variance (ANOVA), t-test, chi-square test, and multivariate regression analysis were used to evaluate the independent risk factors of unsatisfactory hip function.

RESULTS

The mean hip function score was 10.8±2.8 (4.5-15); 61 hips (62.2%) had satisfactory function (23 [23.5%] excellent and 38 [38.8%] good), while 37 hips (37.8%) had unsatisfactory function (16 [16.3%] fair and 21 [21.4%] poor). Spearman correlation analysis indicated that age at surgery was negatively correlated with function score (r=-0.326, p=0.001). The age of patients with satisfactory hip function (34.5±14.2 months; range, 19.4-74.8) was significantly lower than those with unsatisfactory function (43.7±21 months; range, 20.6-95.3) (p=0.011). The hip function score in Group A (14.2±0.8; range, 12.8-15) was significantly higher than in the other three groups (p<0.001). Hip function score in patients with type III or IV AVN was significantly lower than those without AVN, or with type II AVN (p=0.001). Multivariate regression analysis confirmed age at surgery, type of surgery and AVN were negatively correlated with hip function score. Logistic regression analysis and chi-square test confirmed age and type of surgery, and AVN were independent risk factors of unsatisfactory hip function. Multivariate regression analysis found ability to squat and amount of hip flexion and abduction, significantly decreased with age at surgery; while presence of limping, amount of hip flexion, abduction, adduction and external rotation significantly decreased with type of surgery.

DISCUSSION

Age at surgery, type of surgery and severe AVN are independent risk factors for unsatisfactory hip function in patients with late-detected DDH treated by open reduction. The ability to squat, the amount of hip flexion and abduction are the main functional parameters affected by age and surgery.

LEVEL OF EVIDENCE

IV, case series.

Acetabular reaming and sartorius muscle pedicle iliac bone grafting in the treatment of developmental dysplasia of the hip in older children: a retrospective study of 15 patients with more than two years follow-up

PURPOSE

Despite the early diagnosis and treatment of developmental dysplasia of the hip (DDH), some older children still need open reduction. It is usually difficult to get a satisfactory reduction particularly in patients with acetabular defect. The purpose of this study was to evaluate the short-term outcomes of acetabulum reaming and sartorius muscle pedicle iliac bone grafting in the treatment of older children with DDH and acetabular defect.

METHODS

The records of 15 patients with DDH (mean age 113.9 months (sd 29); 17 hips) who were treated with the reported technique between February 2015 and January 2017 were retrospectively reviewed. All patients acquired regular clinical and radiographic follow-ups, and alterations in the acetabular index, centre-edge angle and acetabular head index were measured. Joint function and radiographic results were evaluated with McKay and Severin modified criteria, respectively.

RESULTS

A total of 15 patients were followed up for mean 32.4 months (sd 6.9). The percentages of excellent and good conditions were 94.1% (16/17) according to the Severin modified criteria and 88.2% (15/17) according to the McKay modified criteria. Avascular necrosis of the femoral head and redislocation only occurred in one hip. No cases of ankylosis or bone graft absorption occurred during the follow-up.

CONCLUSION

Reaming the acetabulum and sartorius muscle pedicle iliac bone grafting for repairing the acetabular defect can recover the arcuate structure by increasing the volume of the acetabulum, which is beneficial for achieving a concentric reduction. The short-term outcome was satisfactory, while the long-term results need to be further observed.

LEVEL OF EVIDENCE

IV - retrospective study.

Outcomes of computer-assisted peri-acetabular osteotomy compared with conventional osteotomy in hip dysplasia

Aim of the study

To compare the outcomes after computer-assisted peri-acetabular osteotomy (PAO) and conventional PAO performed for hip dysplasia (DDH).

Methods

Ninety-one patients (98 hips) were enrolled in this study. In each case, DDH was treated with either conventional PAO, in which the angle and direction of the osteotomy was determined by intra-operative X-ray examination, or with computer-assisted PAO, which used the 3D navigation system. Forty hips underwent conventional PAO and 58 hips underwent computer-assisted PAO.

Results

Japanese Orthopaedic Association hip scores improved significantly from 70.0 points pre-operatively to 90.7 points post-operatively in patients with conventional PAO, and from 74.5 points pre-operatively to 94.2 points post-operatively in patients with computer-assisted PAO. In all patients with computer-assisted PAO, the post-operative AHI and VCA angle were within the radiographic target zone. Some patients with conventional PAO had post-operative AHI and VCA angle outside of the target zone. We performed total hip arthroplasty (THA) on five of the 98 PAO hips (5.1%) after an average follow-up period of 5.4 years. None of 58 hips (0%) with computer-assisted PAO was revised.

Discussion

Computer-assisted PAO enabled intra-operative confirmation of osteotomy sites, and the position of the osteotomized bone fragment could be confirmed in real time. Adequate anterior and lateral coverage of the femoral head in patients with computer-assisted PAO resulted in no need for early conversion to THA, in contrast to conventional PAO.

Conclusion

Computer-assisted PAO not only improved accuracy and safety but also achieved sufficient anterior and lateral displacement to prevent the progression of DDH.