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International Orthopaedics

, Volume 42, Issue 3, pp 631–640 | Cite as

Acetabular index is the best predictor of late residual acetabular dysplasia after closed reduction in developmental dysplasia of the hip

  • YiQiang Li
  • YueMing Guo
  • Ming Li
  • QingHe Zhou
  • Yuanzhong Liu
  • WeiDong Chen
  • JingChun Li
  • Federico Canavese
  • HongWen XuEmail author
  • Multi-center Pediatric Orthopedic Study Group of China
Original Paper

Abstract

Purpose

Our objective was to find the best predictor of late residual acetabular dysplasia in developmental dysplasia of the hip (DDH) after closed reduction (CR) and discuss the indications for secondary surgery.

Methods

We retrospectively reviewed the records of 89 patients with DDH (mean age 16.1 ± 4.6 months; 99 hips) who were treated by CR. Hips were divided into three groups according to final outcomes: satisfactory, unsatisfactory and operation. The changes in the acetabular index (AI), centre-edge angle of Wiberg (CEA), Reimer’s index (RI) and centre-head distance discrepancy (CHDD) over time among groups were compared. The power of predictors for late residual acetabular dysplasia of AI, CEA, RI and CHDD at different time points was analysed by logistic regression analysis. Receiver operating characteristics (ROC) curve analysis was used to determine cutoff values and corresponding sensitivity, specificity and diagnostic accuracy for these parameters.

Results

Both AI and CEA improved in all groups of patients following CR. In the satisfactory group, AI progressively decreased until seven to eight years, while CEA increased until nine to ten years (P < 0.05). In the unsatisfactory group, AI and CEA ceased to improve three and two years after CR, respectively (P < 0.05). CEA and RI were significantly better in the satisfactory group compared with the unsatisfactory group at all time points (P < 0.05). Following CR, both RI and CHDD remained stable over time in all groups. Final outcome following CR could be predicted by AI, CEA and RI at all time points (P < 0.01). Cutoff values of AI, CEA and RI were 28.4°, 13.9° and 34.5%, respectively, at one year and 25°, 20° and 27%, respectively, at two to four years post-CR. A total of 80–88% of hips had an unsatisfactory outcome if AI > 28.4° and >25 at one and two to four years following CR, respectively. However, if CEA was less than or RI was larger than the cutoff values at each time point, only 40–60% of hips had an unsatisfactory outcome. Mean sensitivity (0.889), specificity (0.933) and diagnostic accuracy (92.1%) of AI to predict an unsatisfactory outcome were significantly better compared with CEA (0.731; 0.904; 78.2%) and RI (0.8; 0.655; 70.8%) (P < 0.05).

Conclusions

Satisfactory and unsatisfactory hips show different patterns of acetabular development after reduction. AI, CEA and RI are all predictors of final radiographic outcomes in DDH treated by CR, although AI showed the best results. AI continues to improve until seven years after CR in hips with satisfactory outcomes, while it ceases to improve three to four years after CR in hips with unsatisfactory outcomes. According to our results, surgery is indicated if AI >28° 1 year following CR or AI >25° two to four years after CR. CEA and RI should be used as a secondary index to aid in the selection of patients requiring surgery.

Keywords

Developmental dysplasia of the hip Closed reduction Acetabular index Avascular necrosis of femoral head Predictor Residual acetabular dysplasia 

Notes

Compliance with ethical standards

Conflict of interest and source of funding

YiQiang Li, YueMing Guo, and Ming Li contributed equally to this work. The authors declare that they have no conflict interests. No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article.

Ethical approval

All procedures were performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

Informed consent

No patients were involved. This was a retrospective study of patient data, and IRB approval was obtained (GZWCMC 2015020904).

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Copyright information

© SICOT aisbl 2017

Authors and Affiliations

  • YiQiang Li
    • 1
  • YueMing Guo
    • 2
  • Ming Li
    • 3
  • QingHe Zhou
    • 1
  • Yuanzhong Liu
    • 1
  • WeiDong Chen
    • 1
  • JingChun Li
    • 1
  • Federico Canavese
    • 1
    • 4
  • HongWen Xu
    • 1
    • 5
    Email author
  • Multi-center Pediatric Orthopedic Study Group of China
  1. 1.GuangZhou Women and Children’s Medical CenterGuangZhou Medical UniversityGuangZhouChina
  2. 2.Foshan Hospital of TCMFoshanChina
  3. 3.Children’s Hospital of Chongqing Medical UniversityChongqingChina
  4. 4.Pediatric Surgery Department University Hospital EstaingClermont FerrandFrance
  5. 5.Department of pediatric orthopaedicsGuangZhou Women and Children’s Medical CenterGuangZhouChina

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