Risk factors for acetabular retroversion in developmental dysplasia of the hip: Does the Pemberton osteotomy contribute?

Mio Akiyama, Yasuharu Nakashima, Masanobu Oishi, Taishi Sato, Masanobu Hirata, Daisuke Hara, Yukihide Iwamoto

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Abstract

Background: The purpose of this study was to investigate residual acetabular retroversion after skeletal maturity in patients with Pemberton osteotomy. Patients and methods: We compared 40 hips in 36 patients treated with a Pemberton osteotomy (Pemberton group) and 30 hips in 26 patients treated only with a Pavlik harness (Rb group) for developmental dysplasia of the hip. The average age at operation in the Pemberton group was 94.5 months and the follow-up duration was 151.8 months. Radiographic parameters included the acetabular index (α angle) and the center-edge angle of Wiberg, preoperatively and at skeletal maturity. We examined the crossover sign (COS) at the latest follow-up as a sign of acetabular retroversion (AR). We compared the parameters between the two groups and examined the risk factors for acetabular retroversion using a multivariate Cox model. Result: A COS (+) was significantly more frequent in the Pemberton group compared to the Rb group [15 hips (37.5%) vs 3 hips (10%); p = 0.0077]. In the Pemberton group, the average age at operation in COS (+) hips was significantly older than that in COS (-) hips (126.9 vs 72.8 months; p = 0.0005). The preoperative α angle did not vary between hips with and without COS; however, the postoperative α angle was significantly smaller in COS (+) hips. A multiple logistic regression analysis for prediction of COS (+) showed that the age at operation and the amount change of α angle were significant predictors for COS (+) hips. The cut-off of the age at operation was 7 years and 9 months old. Conclusions: AR was present in 37.5% of the hips in the Pemberton group after skeletal maturity. Remodeling of acetabular version was observed in younger patients; however, hips in older patients (>8 years) at the time of operation and greater degrees of correction tended to result in AR.

Original languageEnglish
Pages (from-to)90-96
Number of pages7
JournalJournal of Orthopaedic Science
Volume19
Issue number1
DOIs
Publication statusPublished - Jan 2014

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Hip Dislocation
Osteotomy
Hip
Proportional Hazards Models
Logistic Models
Regression Analysis

All Science Journal Classification (ASJC) codes

  • Surgery
  • Orthopedics and Sports Medicine

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Risk factors for acetabular retroversion in developmental dysplasia of the hip : Does the Pemberton osteotomy contribute? / Akiyama, Mio; Nakashima, Yasuharu; Oishi, Masanobu; Sato, Taishi; Hirata, Masanobu; Hara, Daisuke; Iwamoto, Yukihide.

In: Journal of Orthopaedic Science, Vol. 19, No. 1, 01.2014, p. 90-96.

Research output: Contribution to journalArticle

Akiyama, Mio ; Nakashima, Yasuharu ; Oishi, Masanobu ; Sato, Taishi ; Hirata, Masanobu ; Hara, Daisuke ; Iwamoto, Yukihide. / Risk factors for acetabular retroversion in developmental dysplasia of the hip : Does the Pemberton osteotomy contribute?. In: Journal of Orthopaedic Science. 2014 ; Vol. 19, No. 1. pp. 90-96.
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abstract = "Background: The purpose of this study was to investigate residual acetabular retroversion after skeletal maturity in patients with Pemberton osteotomy. Patients and methods: We compared 40 hips in 36 patients treated with a Pemberton osteotomy (Pemberton group) and 30 hips in 26 patients treated only with a Pavlik harness (Rb group) for developmental dysplasia of the hip. The average age at operation in the Pemberton group was 94.5 months and the follow-up duration was 151.8 months. Radiographic parameters included the acetabular index (α angle) and the center-edge angle of Wiberg, preoperatively and at skeletal maturity. We examined the crossover sign (COS) at the latest follow-up as a sign of acetabular retroversion (AR). We compared the parameters between the two groups and examined the risk factors for acetabular retroversion using a multivariate Cox model. Result: A COS (+) was significantly more frequent in the Pemberton group compared to the Rb group [15 hips (37.5{\%}) vs 3 hips (10{\%}); p = 0.0077]. In the Pemberton group, the average age at operation in COS (+) hips was significantly older than that in COS (-) hips (126.9 vs 72.8 months; p = 0.0005). The preoperative α angle did not vary between hips with and without COS; however, the postoperative α angle was significantly smaller in COS (+) hips. A multiple logistic regression analysis for prediction of COS (+) showed that the age at operation and the amount change of α angle were significant predictors for COS (+) hips. The cut-off of the age at operation was 7 years and 9 months old. Conclusions: AR was present in 37.5{\%} of the hips in the Pemberton group after skeletal maturity. Remodeling of acetabular version was observed in younger patients; however, hips in older patients (>8 years) at the time of operation and greater degrees of correction tended to result in AR.",
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T2 - Does the Pemberton osteotomy contribute?

AU - Akiyama, Mio

AU - Nakashima, Yasuharu

AU - Oishi, Masanobu

AU - Sato, Taishi

AU - Hirata, Masanobu

AU - Hara, Daisuke

AU - Iwamoto, Yukihide

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AB - Background: The purpose of this study was to investigate residual acetabular retroversion after skeletal maturity in patients with Pemberton osteotomy. Patients and methods: We compared 40 hips in 36 patients treated with a Pemberton osteotomy (Pemberton group) and 30 hips in 26 patients treated only with a Pavlik harness (Rb group) for developmental dysplasia of the hip. The average age at operation in the Pemberton group was 94.5 months and the follow-up duration was 151.8 months. Radiographic parameters included the acetabular index (α angle) and the center-edge angle of Wiberg, preoperatively and at skeletal maturity. We examined the crossover sign (COS) at the latest follow-up as a sign of acetabular retroversion (AR). We compared the parameters between the two groups and examined the risk factors for acetabular retroversion using a multivariate Cox model. Result: A COS (+) was significantly more frequent in the Pemberton group compared to the Rb group [15 hips (37.5%) vs 3 hips (10%); p = 0.0077]. In the Pemberton group, the average age at operation in COS (+) hips was significantly older than that in COS (-) hips (126.9 vs 72.8 months; p = 0.0005). The preoperative α angle did not vary between hips with and without COS; however, the postoperative α angle was significantly smaller in COS (+) hips. A multiple logistic regression analysis for prediction of COS (+) showed that the age at operation and the amount change of α angle were significant predictors for COS (+) hips. The cut-off of the age at operation was 7 years and 9 months old. Conclusions: AR was present in 37.5% of the hips in the Pemberton group after skeletal maturity. Remodeling of acetabular version was observed in younger patients; however, hips in older patients (>8 years) at the time of operation and greater degrees of correction tended to result in AR.

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