Revisionsendoprothetik

Perka, Carsten; Fink, Bernd; Millrose, Michael; Sentürk, Ufuk; Wagner, Michael; Schröder, Jörg; Bail, Hermann Josef; Ascherl, R.; Thiele, Kathi; Götze, Christian

doi:10.1007/978-3-642-14646-6_14

Cited by 14 publications

(1 citation statement)

References 396 publications

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“…The Paprosky classification distinguishes bone defects according to possible treatment options, the AAOS classification according to their appearance as cavitary or segmental and their location. Within the classification schemes, the estimation of bone loss is often based on remaining anatomical landmarks, the contra‐lateral side, and/or the surgeons experience …”

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confidence: 99%

Method for quantitative assessment of acetabular bone defects

Hettich¹,

Schierjott

Ramm³

et al. 2018

Journal Orthopaedic Research

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The objective of the study was to suggest a novel quantitative assessment of acetabular bone defects based on a statistical shape model, validate the method, and present preliminary results. Two exemplary CT‐data sets with acetabular bone defects were segmented to obtain a solid model of each defect pelvis . The pathological areas around the acetabulum were excluded and a statistical shape model was fitted to the remaining healthy bone structures. The excluded areas were extrapolated such that a solid model of the native pelvis per specimen resulted (i.e., each pelvis without defect). The validity of the reconstruction was tested by a leave‐one‐out study. Validation results showed median reconstruction errors of 3.0 mm for center of rotation, 1.7 mm for acetabulum diameter, 2.1° for inclination, 2.5° for anteversion, and 3.3 mm 3 for bone volume around the acetabulum. By applying Boolean operations on the solid models of defect and native pelvis , bone loss and bone formation in four different sectors were assessed. For both analyzed specimens, bone loss and bone formation per sector were calculated and were consistent with the visual impression. In specimen_1 bone loss was predominant in the medial wall (10.8 ml; 79%), in specimen_2 in the posterior column (15.6 ml; 46%). This study showed the feasibility of a quantitative assessment of acetabular bone defects using a statistical shape model‐based reconstruction method. Validation results showed acceptable reconstruction accuracy, also when less healthy bone remains. The method could potentially be used for implant development, pre‐clinical testing, pre‐operative planning, and intra‐operative navigation. © 2018 The Authors. Journal of Orthopaedic Research ® Published by Wiley Periodicals, Inc. on behalf of Orthopaedic Research Society. J Orthop Res 9999:1–9, 2018.

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confidence: 99%