P014 | THE INFLUENCE OF SUBCHONDRAL BONE CYSTS ON TISSUE PRESSURES IN THE TIBIOTALAR JOINT

Talbott, Harriet; Wilkins, Richard; Redmond, Anthony; Brockett, Claire; Mengoni, Marlene

Abstract

Introduction: Subchondral bone cysts are an indicator of late stage
haemophilic joint disease (HJD); however, the implication of these
cysts on joint health is little understood. The aim of this study was
to assess, computationally, the influence of subchondral bone cysts
on tissue pressures through their inclusion in patient-specific finite
element (FE) models.
Methods: Chronologically sequential (minimum of 3 sequences over
2 years), non-weightbearing Magnetic Resonance Imaging (MRI) sequences were acquired for three people with severe Haemophilia A. The main inclusion criteria for the study was the imaging presence
of subchondral bone cysts (n = 15). Segmentations of subchondral
bone cysts, bones, and cartilage were generated, and segmentation specific FE meshes were created using Simpleware-ScanIP 2017.6 (Synopsis). FE models were developed to simulate the forces associated with neutral still standing—keeping the bone positions of the MR images—for each patient under two cyst conditions: with the cyst defined as intact bone, and as de-facto cystic tissue (Abaqus 2017, Dassault Systèmes). The tissue pressures were extracted from both the cartilage and bones, to investigate the influence of the cyst presence throughout the ankle.
Results: For each patient, the volume and location of the subchondral bone cysts varied over time, and the maximum pressures in the
contact areas reflected this. 7 cases had cysts located in the tibia
alone, in these the maximum pressure increased on average by 77%
(st. dev. 48%) in the tibia, 16% (31%) in the talus, and 32% (35%) in
the cartilage contact area upon the addition of cysts. 4 cases had
cysts in the talus alone—the pressure increased on average by 3%
(26%) in the tibia, 66% (107%) in the talus, and 14% (24%) in the cartilage. The greatest variations were seen in the 4 cases where cysts were present in both bones, with an average increase of 137% (37%) in the tibia, 97% (51%) in the talus, and 120% (145%) in the cartilage.
Discussion/Conclusion: This computational work showed that cysts
of all sizes appear to increase the pressures across all components of the joint, although there is no clear correlation between the volume of subchondral bone cysts and the change in maximum pressure value. The presence of any cystic tissue within the joint is therefore likely detrimental to joint health, as larger tissue pressures may be linked to an increased rate of HJD progression.

Citation

Talbott, H., Wilkins, R., Redmond, A., Brockett, C., & Mengoni, M. (2020). P014 | THE INFLUENCE OF SUBCHONDRAL BONE CYSTS ON TISSUE PRESSURES IN THE TIBIOTALAR JOINT. Haemophilia, 26(S2), https://doi.org/10.1111/hae.13911

• Presentation Conference Type: Conference Paper (published)
• Conference Name: 13th Annual Congress of European Association for Haemophilia and Allied Disorders 2020, 5–7 February 2020
• Online Publication Date: Jan 28, 2020
• Publication Date: 2020-02
• Deposit Date: Oct 5, 2022
• Journal: Haemophilia
• Print ISSN: 1351-8216
• Publisher: Wiley
• Peer Reviewed: Not Peer Reviewed
• Volume: 26
• Issue: S2
• DOI: https://doi.org/10.1111/hae.13911
• Keywords: Genetics (clinical); Hematology; General Medicine
• Public URL: https://hull-repository.worktribe.com/output/4087419