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Preoperative planning of total hip arthroplasty on dysplastic acetabuli

Abstract

Background

When performing total hip arthroplasty (THA) on a dysplastic hip, proper positioning of the acetabular component may not allow for more than 70% coverage. Structural support in the form of an autograft or a high porosity metal augment may be necessary. The purpose of the study was to investigate the value of preoperative templating and deformity classification in predicting cup coverage and the need for structural support.

Methods

65 cases of THA for DDH were retrospectively analysed. 2 observers independently classified each dysplastic hip according to Hartofilakidis and determined the extent of cup coverage via templating software on preoperative digital AP pelvic radiographs.

Results

Weighted kappa interobserver agreement was 0.68 for cup coverage and 0.76 for Hartofilakidis type. Structural support was necessary in 10 hips. No structural support was necessary in Hartofilakidis type 1, dysplasia cases. However, 27-30% of cases with type 2 or type 3 dysplasia required structural support. All cases with templated cup coverage of 65% or less required structural support. Templated coverage within 65-75% and over 75% resulted in 20% and 10% of patients receiving structural augmentation, respectively.

Conclusions

Preoperative planning for THA in the setting of hip dysplasia is crucial and can provide valuable insight to the need for column augmentation. However, the 3-D severity of the deformity may be underestimated in the 2-D radiographs.

Hip Int 2017; 27(1): 55 - 59

Article Type: ORIGINAL RESEARCH ARTICLE

DOI:10.5301/hipint.5000419

Authors

Dror Lakstein, Zachary Tan, Nugzar Oren, Tatu Johannes Mäkinen, Allan E. Gross, Oleg Safir

Article History

Disclosures

Financial support: None.
Conflict of interest: AEG or a member of his immediate family, has or may receive payments or benefits during the study period from Zimmer.

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Authors

Affiliations

  • Orthopedic department, E. Wolfson medical center, Holon - Israel
  • Sackler faculty of Medicine, Tel-Aviv University, Tel-Aviv - Israel
  • Orthopedic Division, Mount Sinai Hospital, Toronto, Ontario - Canada
  • Faculty of Medicine, University of Toronto, Toronto, Ontario - Canada

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