This study investigates the relationships between Intervertebral Disc (IVD) morphology and biomechanics using patient-specific (PS) finite element (FE) models and poromechanical simulations. 169 3D lumbar IVD shapes from the European project MySpine (FP7-269909), spanning healthy to Pfirrmann grade 4 degeneration, were obtained from MRIs. A Bayesian Coherent Point Drift algorithm aligned meshes to a previously validated structural FE mesh of the IVD. After mesh quality analyses and Hausdorff distance measurements, mechanical simulations were performed: 8 and 16 hours of sleep and daytime, respectively, applying 0.11 and 0.54 MPa of pressure on the upper cartilage endplate (CEP). Simulation results were extracted from the anterior (ATZ) and posterior regions (PTZ) and the center of the nucleus pulposus (CNP). Data mining was performed using Linear Regression, Support Vector Machine, and eXtreme Gradient Boosting techniques. Mechanical variables of interest in DD, such as pore fluid velocity (FLVEL), water content, and swelling pressure, were examined. The morphological variables of the simulated discs were used as input features. Local morphological variables significantly impacted the local mechanical response. The local disc heights, respectively in the mid (mh), anterior (ah), and posterior (ph) regions, were key factors in general. Additionally, fluid transport, reflected by FLVEL, was greatly influenced (r2 0.69) by the shape of the upper and lower cartilage endplates (CEPs). This study suggests that disc morphology affects Mechanical variables of interest in DD. Attention should be paid to the antero-posterior distribution and local effects of disc heights. Surprisingly, the CEP morphology remotely affected the fluid transport in NP volumes around mid-height, and mechanobiological implications shall be explored. In conclusion, patient-specific IVD modeling has strong potential to unravel important correlations between IVD phenotypes and local tissue regulation. Acknowledgments: European Commission: Disc4All-MSCA-2020-ITN-ETN GA: 955735; O-Health-ERC-CoG-2021-101044828

Background. Back pain has become a worldwide problem and excessive, repetitive rotation has been shown to cause tissue damage. A sleeping posture similar to that of the foetal position has been suggested to limit unnecessary rotation of the lumbar spine. The Rophi™ cushion, utilises this theory to provide spinal alignment and improved sleeping posture. This study aims to assess the subjective experience and biomechanical effects of the Rophi™ cushion in participants with simple mechanical lower back pain (LBP). Methods & Results. Fifteen participants (aged 44 ± 9.7 years) with simple mechanical LBP were recruited using the Red Flags screening form. The kinematics of the pelvis, lower limbs, lumbar and thoracic spine were analysed in six degrees of freedom whilst the participants lay in a semi-foetal position. Visual analogue scales were used to measure participant pain and discomfort levels during sleep pre and post a one week cushion intervention. Kinematic results show the main significant difference in joint angles occurred at the hip in all three planes, and between the lower lumbar region and the pelvis in the coronal plane. Subjective experience showed a reduction in the number of days with poor sleep quality and a significant reduction in frequency and intensity of lower back pain and stiffness when waking. Conclusions. Through repositioning of the hips and lower lumbar spine, overall it appears the individual is moved towards a more neutral position when using the Rophi™ cushion and a one week intervention shows a significant improvement in lower back pain on waking. Conflicts of Interest. None. Source of Funding. Funded by the NWDA Innovation voucher scheme. This abstract has not been previously published in whole or substantial part and has not been previously presented at a national meeting

The benefits of surgical treatments for osteoarthritis (OA) of the knee are well established. There are also advances in non-surgical management techniques that can be used successfully, and these may be particularly suitable for patients with mild to moderate disease, or for those in whom surgery is contra-indicated. Intra-articular viscosupplementation is one such method, and studies have shown that this can give short-term symptomatic relief. Our study looked at the patient perceived benefits of a course of Hylan G-F 20 (Synvisc¯) by comparing the modified Brief Pain Inventory short form (BPI-sf) scores before treatment and after three months. The BPI-sf is a validated, widely used, self-administered questionnaire that measures both sensory and reactive dimensions of the pain using scales of 0-10 or 0-100%. This study included 12 consecutive patients with OA of the knee treated with a course of three Synvisc¯ injections performed a week apart. The data were treated as non-parametric and therefore Wilcoxon signed rank tests were performed. The data are presented as median (IQR). The results showed statistically significant (p<0.05), and clinically significant (reduction >1 point) improvements in worst, best, and average pain scores (over the previous 24 hours) three months following treatment compared to those before treatment. Relief obtained from routinely taken analgesia was significantly improved from 30%(12.5-57.5) to 75%(42.5-100) (p=0.009) following treatment. There were significant reductions in the interference of the pain with: general activity from 6(4.25-8.75) to 2.5(0-6.75), (p=0.006); mood from 6(2-8) to 0(0-5), (p=0.004); walking ability from 7.5(4-8.75) to 3.5(0.25-6), (p=0.004); normal work from 5.5(3.5-8) to 1.5(0-5), (p=0.009); relations with other people from 4(2-8) to 0(0-3.5), (p=0.006); sleep from 6(3.25-9.5) to 1.5(0-5.75), (p=0.004); enjoyment of life from 6(2.75-8.5) to 1.5(0-6), (p=0.005). All patients found the treatment acceptable. We conclude that patients reported significant improvements in pain, physical and emotional functioning, and sleep three months following treatment with this viscosupplementation treatment

Objectives

The patient-rated wrist evaluation (PRWE) and the Disabilities of the Arm, Shoulder and Hand (DASH) questionnaire are patient-reported outcome measures (PROMs) used for clinical and research purposes. Methodological high-quality clinimetric studies that determine the measurement properties of these PROMs when used in patients with a distal radial fracture are lacking. This study aimed to validate the PRWE and DASH in Dutch patients with a displaced distal radial fracture (DRF).