ArticleJournal of orthopaedic surgery and research2022
Mathematical calculation of the difference in shortening length after two types of proximal femoral varus and an investigation of their applicable conditions: an own-pair design.
Article in Journal of orthopaedic surgery and research, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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2 citing papers in PubMed, 1 citations in OpenAlex.
- Patient-specific proximal femoral plate combined with a modular 3D-printed osteotomy guide system in children with developmental dysplasia of the hip: a retrospective comparative study.Frontiers in public health · 2026Article
- Application of 3D-printed osteotomy guide plates in proximal femoral osteotomy for DDH in children: a retrospective study.Journal of orthopaedic surgery and research · 2023Article
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4 authors at 2 institutions in 1 country.
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Abstract
backgroundThe shortening length of the lower extremity after the proximal femoral osteotomy is an important issue to be considered in preoperative planning of developmental dysplasia of the hip (DDH) in children. There is still a lack of research on shortening the length of the lower extremities in different proximal femoral osteotomy varus styles. We aimed to verify the relationship between the shortening length after "point-to-face" and "face-to-face" varus osteotomy and proposed a formula for calculating the difference in shortening length and verified its feasibility.
methodsFifty-five children with unilateral DDH were enrolled. The preoperative hip CT data were imported into mimics 21, 3-Matic 10 (Materialise, Leuven, Belgium) for femoral reconstruction and simulated osteotomy, and the difference (t) was calculated by directly measuring the length of the proximal femur after osteotomy. d* sinθ was measured in a three-dimensional environment to calculate the difference in femoral shortening length between the two osteotomy methods (t').
resultsThe results of the direct measurement method and the formula measurement method are shown in the table; the differences in the results of the femoral shortening length difference were not statistically significant (P > 0.05). The limits of agreement (95%) of the difference values using Bland-Altman analysis were between - 0.50 and 0.46 mm, with a mean of - 0.02 mm, indicating a high agreement between the two methods. r = 0.99 (P < 0.05) for the Pearson correlation analysis between the direct measurement method and the calculated method showed that the two methods were significantly correlated.
conclusionsThe derived formula can accurately calculate the difference in the shortening length of the proximal femur after "point-to-face" and "face-to-face" varus osteotomy in children with DDH, which is suitable for clinical application.
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