A Pilot Three-Dimensional Evaluation of Acetabular Bony Coverage After Modified Spitzy Shelf Acetabuloplasty.

Fumito Kobayashi, Takehito Hananouchi, Kenichi Oe, Shohei Sogawa, Tomohisa Nakamura, Takanori Saito

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Article in Biomimetics (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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6 authors.

Fumito KobayashiDepartment of Orthopaedic Surgery, Kansai Medical University, 2-5-1 Shinmachi, Hirakata 573-1010, Japan.

Takehito HananouchiBiodesign Division, Department of Academia-Government-Industry Collaboration, Office of Research and Academia-Government-Community Collaboration, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan.ORCID 0000-0001-6092-2910

Kenichi OeDepartment of Orthopaedic Surgery, Kansai Medical University, 2-5-1 Shinmachi, Hirakata 573-1010, Japan.ORCID 0000-0003-1756-8447

Shohei SogawaDepartment of Orthopaedic Surgery, Kansai Medical University, 2-5-1 Shinmachi, Hirakata 573-1010, Japan.

Tomohisa NakamuraDepartment of Orthopaedic Surgery, Kansai Medical University, 2-5-1 Shinmachi, Hirakata 573-1010, Japan.

Takanori SaitoDepartment of Orthopaedic Surgery, Kansai Medical University, 2-5-1 Shinmachi, Hirakata 573-1010, Japan.

Funding

KAKENHI JP25K15982

6 · The paper itself

Abstract

Modified Spitzy shelf acetabuloplasty is a joint-preserving surgical procedure for acetabular dysplasia that aims to enhance bony coverage of the hip joint. Although prior studies have primarily relied on two-dimensional (2D) radiographic evaluations, comprehensive three-dimensional (3D) assessments remain limited. The purpose of this retrospective study was to evaluate changes quantitatively in acetabular coverage following modified Spitzy shelf acetabuloplasty using 3D models reconstructed from computed tomography (CT) images. We retrospectively analyzed 11 hips in 11 patients who underwent staged bilateral modified Spitzy shelf acetabuloplasty. Preoperative and postoperative CT data were used to construct 3D pelvic models, which were registered using anatomical landmarks. Bone graft dimensions, insertion angle, and placement location were evaluated. Acetabular sector angles (ASA), representing circumferential coverage of the femoral head, were measured at 15° intervals on the functional pelvic plane and the anterior pelvic plane. The mean bone graft dimensions were 26.3 ± 3 mm (anteroposterior length) and 12.7 ± 2.7 mm (mediolateral length), providing coverage of 49.5° ± 9.1°. Postoperative ASA increased significantly from 34.5° to 60° on the functional pelvic plane and from 0° to 45° on the anterior pelvic plane (both

Indexed as

3D registrationacetabular dysplasiaacetabular sector Angle (ASA)bony coveragecomputed tomographymodified Spitzy shelf acetabuloplastythree-dimensional analysis

Identifiers

PMID41744563

DOI10.3390/biomimetics11020117

PMCPMC12938046

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