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A novel method for assessing postoperative femoral head reduction in developmental dysplasia of the hip.

Cooper A, Evans O, Ali F, Flowers M - J Child Orthop (2014)

Bottom Line: Numerous measurements are used to ascertain the adequacy of reduction but can be inconsistent in evaluating femoral head position.This study describes the morphology of the developing acetabulum in DDH and validates a novel method to assess adequate reduction of the dysplastic hip following closed or open reduction.A retrospective review was performed of 66 consecutive patients undergoing reduction of hip dislocation over a 2-year period.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthopaedics, Sheffield Children's Hospital, Western Bank, Sheffield, S10 2TH, UK.

ABSTRACT

Purpose: Developmental dysplasia of the hip (DDH) affects approximately 1 % of live births. Dislocated hips require reduction and stabilisation in a spica cast, and reduction efficacy is assessed radiologically. Numerous measurements are used to ascertain the adequacy of reduction but can be inconsistent in evaluating femoral head position. This study describes the morphology of the developing acetabulum in DDH and validates a novel method to assess adequate reduction of the dysplastic hip following closed or open reduction.

Methods: A retrospective review was performed of 66 consecutive patients undergoing reduction of hip dislocation over a 2-year period. Three independent reviewers evaluated postoperative CT scans to assess anterior-posterior (AP) displacement and modified Shenton's line. Acetabular morphology was also assessed along with hip congruency using a described novel 'posterior neck line'.

Results: Dislocated hips were successfully identified using the posterior neck line with a sensitivity of 0.71 and specificity of 0.88 giving a negative predictive value of 0.97. The interobserver reliability of this technique was higher in comparison against both (AP) displacement and modified Shenton's line.

Conclusions: We have shown a novel approach in assessing the acetabular morphology of DDH and a novel technique to accurately confirm the reduction of dislocated hips following open or closed reduction.

No MeSH data available.


Related in: MedlinePlus

Postoperative single slice CT showing the posterior neck line in a reduced left hip
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Related In: Results  -  Collection


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Fig3: Postoperative single slice CT showing the posterior neck line in a reduced left hip

Mentions: The posterior neck line is described as the continuation of a line from the posterior aspect of the femoral neck along the physeo-metaphyseal border of the greater trochanter of the proximal femur as shown in Fig. 3. This line is seen to traverse the acetabulum anterior to or at the point of transition of the concave acetabulum to the convex posterior wall in reduced hips but posterior to this transition point in dislocated hips.Fig. 3


A novel method for assessing postoperative femoral head reduction in developmental dysplasia of the hip.

Cooper A, Evans O, Ali F, Flowers M - J Child Orthop (2014)

Postoperative single slice CT showing the posterior neck line in a reduced left hip
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4128942&req=5

Fig3: Postoperative single slice CT showing the posterior neck line in a reduced left hip
Mentions: The posterior neck line is described as the continuation of a line from the posterior aspect of the femoral neck along the physeo-metaphyseal border of the greater trochanter of the proximal femur as shown in Fig. 3. This line is seen to traverse the acetabulum anterior to or at the point of transition of the concave acetabulum to the convex posterior wall in reduced hips but posterior to this transition point in dislocated hips.Fig. 3

Bottom Line: Numerous measurements are used to ascertain the adequacy of reduction but can be inconsistent in evaluating femoral head position.This study describes the morphology of the developing acetabulum in DDH and validates a novel method to assess adequate reduction of the dysplastic hip following closed or open reduction.A retrospective review was performed of 66 consecutive patients undergoing reduction of hip dislocation over a 2-year period.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthopaedics, Sheffield Children's Hospital, Western Bank, Sheffield, S10 2TH, UK.

ABSTRACT

Purpose: Developmental dysplasia of the hip (DDH) affects approximately 1 % of live births. Dislocated hips require reduction and stabilisation in a spica cast, and reduction efficacy is assessed radiologically. Numerous measurements are used to ascertain the adequacy of reduction but can be inconsistent in evaluating femoral head position. This study describes the morphology of the developing acetabulum in DDH and validates a novel method to assess adequate reduction of the dysplastic hip following closed or open reduction.

Methods: A retrospective review was performed of 66 consecutive patients undergoing reduction of hip dislocation over a 2-year period. Three independent reviewers evaluated postoperative CT scans to assess anterior-posterior (AP) displacement and modified Shenton's line. Acetabular morphology was also assessed along with hip congruency using a described novel 'posterior neck line'.

Results: Dislocated hips were successfully identified using the posterior neck line with a sensitivity of 0.71 and specificity of 0.88 giving a negative predictive value of 0.97. The interobserver reliability of this technique was higher in comparison against both (AP) displacement and modified Shenton's line.

Conclusions: We have shown a novel approach in assessing the acetabular morphology of DDH and a novel technique to accurately confirm the reduction of dislocated hips following open or closed reduction.

No MeSH data available.


Related in: MedlinePlus