Coxa Magna After Open Reduction for Developmental Dislocation of the Hip

Imatani, Junya; Miyake, Yoshihiro; Nakatsuka, Yoichi; Akazawa, Hirofumi; Mitani, Shigeru

doi:10.1097/01241398-199505000-00015

Cited by 30 publications

(20 citation statements)

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“…In the current study, the diameter of the capital femoral ossific nucleus on the affected side became equal to that on the unaffected side at one year after surgery in all groups. Coxa magna was found in 10 (30%) of the 33 hips at 6 years of age, equivalent to the incidence reported from previous studies [12,14]. The a/a 0 ratio did not show any significant correlation with the AI or the CE-A, and had no direct effect on acetabular development.…”

Section: Discussionsupporting

confidence: 77%

“…Coxa magna has been identified in approximately 34e36% of cases after OR [12,14], but there is no recommendation of the relationship between coxa magna and acetabular development. In the current study, the diameter of the capital femoral ossific nucleus on the affected side became equal to that on the unaffected side at one year after surgery in all groups.…”

Section: Discussionmentioning

confidence: 99%

“…1). According to the criteria described by Imatani et al [12], a femoral head with a diameter greater than 120% of the unaffected side was defined as coxa magna. Each item was evaluated preoperatively and at 2, 4, 6, and 12 months after surgery, and subsequently each year up to 6 years of age.…”

Section: Methodsmentioning

confidence: 99%

“…We consider that coxa magna is responsible for poor acetabular origin and incongruity. There are only a few reports describing acetabular development over time after reduction to correct developmental dislocation of the hip [4,13], and the relationship between coxa magna and acetabular development is unclear [12,14]. The purpose of the present study was to evaluate acetabular development following treatment by OR alone, in children who were diagnosed with dislocated hips after walking age.…”

Section: Introductionmentioning

confidence: 98%

“…Tanabe's procedure is known to produce favourable outcomes without additional surgery, in contrast to other methods such as Ludloff's method [7e11]. However, coxa magna has been recognized in several patients treated by this method [12]. We consider that coxa magna is responsible for poor acetabular origin and incongruity.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Kagawa

Endo

Tetsunaga

et al. 2016

Journal of Orthopaedic Science

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a b s t r a c tBackground: 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 6e12 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 centreedge angle at one year after open reduction was significantly associated with acetabular development (P ¼ 0.044). The cut-off value was À2 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.

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Section: Discussionsupporting

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%