Computer assisted planning and orbital surgery: patient-related prediction of osteotomy size in proptosis reduction
type: Dataset
description: BACKGROUND: Proptosis is characterized by a protrusion of the eyeball due to an increase of the orbital tissue volume. To recover a normal eyeball positioning, the most frequent surgical technique consists in the osteotomy of orbital walls combined with the manual loading on the eyeball. Only a rough clinical rule is currently available for the surgeons but it is useless for this technique. The first biomechanical model dealing with proptosis reduction, validated in one patient, has been previously proposed by the authors. METHODS: This paper proposes a rule improving the pre-operative planning of the osteotomy size in proptosis reduction. Patient-related poroelastic FE models combined with sensitivity studies were used to propose two clinical rules to improve the pre-operative planning of proptosis reduction. This poroelastic model was run on 12 patients. Sensitivity studies permitted to establish relationships between the osteotoemy size, the patient-related orbital volume, the decompressed tissue volume and the eyeball backward displacement. FINDINGS: The eyeball displacement and the osteotomy size were non-linearly related: an exponential rule has been proposed. The patient-related orbital volume showed a significant influence: a bi-quadratic analytical equation liking the osteotomy size, the orbital volume and the targeted eyeball protrusion has been established. INTERPRETATION: Two process rules derived from patient-related biomechanical FE models have been proposed for the proptosis reduction planning. The implementation of the process rules into a clinical setting is easy since only a sagittal radiography is required. The osteotomy size can be monitored using optical guided instruments.
issued: 2026-05-12T18:12:48.362243
language: en
modified: 2026-05-12T18:12:48.362248
contact point: Organization
  fn: CCSD
keyword: computer-assisted-planning
keyword: finite-element-method
keyword: infoeu-reposemanticsarticle
keyword: journal-articles
keyword: orbital-surgery
keyword: physmecabiomphysics-physicsmechanics-physicsbiomechanics-physicsmed-ph
keyword: poroelasticity
keyword: proptosis
keyword: spimecabiomengineering-sciences-physicsmechanics-physicsmed-phbiomechanics-physicsmed-p
landing page: 0268-0033

Computer assisted planning and orbital surgery: patient-related prediction of osteotomy size in proptosis reduction
type: Distribution
format: HTML
issued: 2026-05-12T18:12:48.432428
modified: 2026-05-12T18:12:48.334799
access URL: https://hal.science/hal-00080069

test_moissonnage_selune
type: Agent