Article
Clinical Neurology
Bailey O'Connor, Caroline E. Drolet, Jean-Christophe A. Leveque, Venu Nemani, Katie L. Krause, Michael Dorsi, Samuel Schroerlucke, Jesse Shen, Philip K. Louie
Summary: This retrospective study compared the 6-month postoperative radiographic outcomes of lumbar spine in patients undergoing transforaminal (TLIF), posterior (PLIF), anterior (ALIF), and lateral (LLIF) interbody fusions. The results showed that ALIF/LLIF procedures resulted in improved segmental lordosis and reduced pelvic incidence to lumbar lordosis (PI-LL) mismatch compared to TLIF/PLIF procedures. Additionally, ALIF/LLIF procedures decreased lordosis at adjacent levels, leading to a more neutral position.
Article
Clinical Neurology
Han Jo Kim, R. Kiran Alluri, Renaud Lafage, Jonathan Elysee, Justin S. Smith, Gregory M. Mundis, Christopher Shaffrey, Christopher P. Ames, Douglas C. Burton, Eric O. Klineberg, Shay Bess, Frank Schwab, Munish Gupta, Virginie Lafage
Summary: In this retrospective study of a multicenter Adult Spinal Deformity (ASD) Database, the changes in pelvic tilt (PT) were found to be significantly correlated with regional changes in lumbar lordosis. Specifically, an increase in lumbar lordosis in the L1-4 region correlated with a decrease in PT, while an increase in lumbar lordosis in the L4-S1 region also resulted in a decrease in PT. These findings provide valuable insights for surgical planning in cases of ASD.
Article
Clinical Neurology
Yuhua Wu, Xiaofei Chen, Fuwen Dong, Linyang He, Guohua Cheng, Yuwen Zheng, Chunyu Ma, Hongyan Yao, Sheng Zhou
Summary: We developed a cascaded HRNet model based on deep learning algorithm, which can automatically measure X-ray imaging parameters of lumbar sagittal curvature and show promising prediction performance.
EUROPEAN SPINE JOURNAL
(2023)
Article
Clinical Neurology
Louis Boissiere, Fernando Guevara-villazon, Anouar Bourghli, Ralph Abdallah, Ferran Pellise, Javier Pizones, Ahmet Alanay, Frank Kleinstueck, Daniel Larrieu, Ibrahim Obeid
Summary: This study retrospectively analyzed the relationship between rod and spinal shape in adult spinal deformity surgery. The results showed variations between the curvatures of the rod and spine, suggesting that the shape of the rod does not seem to predict the shape of the spine in the sagittal plane.
EUROPEAN SPINE JOURNAL
(2023)
Article
Clinical Neurology
Hwee Weng Dennis Hey, Jun-Hao Tan, Bernard Ong, Akshay Kumar, Gabriel Liu, Hee-Kit Wong
Summary: The study aimed to describe novel radiographic markers of sacropelvic morphology and analyze the relationship between the pelvis and spine in standing and sitting postures. Significant differences were observed in sagittal radiographic parameters between the two postures. Multivariate analysis identified predictive parameters for different spinal deformities in relation to pelvic and sacral morphology.
CLINICAL NEUROLOGY AND NEUROSURGERY
(2021)
Article
Orthopedics
Yasuhito Takahashi, Kei Watanabe, Masashi Okamoto, Shun Hatsushikano, Kazuhiro Hasegawa, Naoto Endo
Summary: In this study, we found that the novel morphologic parameters SIP and PIA were reliable for determining the morphology and orientation of the pelvis. The ideal lumbar lordosis angle could be accurately predicted using SIP, with equal accuracy as using PI.
BMC MUSCULOSKELETAL DISORDERS
(2021)
Article
Orthopedics
Samir Smajic, Aleksandar Vujadinovic, Adnan Kasapovic, Dakheel A. Aldakheel, Yann Philippe Charles, Axel Walter, Jean-Paul Steib, Nicola Maffulli, Filippo Migliorini, Alice Baroncini
Summary: The study showed that Mobidisc implantation led to improvement in lumbar lordosis (LL) and segmental lordosis (SL) at the treated level, with an increase in both anterior and posterior disc height. However, disc height at the adjacent level decreased.
JOURNAL OF ORTHOPAEDIC SURGERY AND RESEARCH
(2022)
Article
Clinical Neurology
Mark J. Lambrechts, Nicholas Siegel, Brian A. Karamian, Donald J. Fredericks, John Curran, Jordan Safran, Jose A. Canseco, Barrett I. Woods, David Kaye, Alan S. Hilibrand, Christopher K. Kepler, Alexander R. Vaccaro, Gregory D. Schroeder
Summary: This retrospective cohort study aimed to determine if intraoperative lumbar lordosis and segmental lordosis coincide with perioperative change in lordosis. The study found that early postoperative radiographs may not accurately reflect the improvement in lumbar lordosis seen on intraoperative radiographic imaging, but they are predictive of long-term lumbar sagittal alignment. Additionally, cage subsidence and allograft resorption have an impact on segmental lordosis, but do not significantly affect lumbar lordosis.
Article
Orthopedics
Xiang -Yu Li, Yu Wang, Kai Yang, Cheng-Xin Liu, Wei-Guo Zhu, Chao Kong, Shi-Bao Lu
Summary: This study describes and classifies common variations and compensation mechanisms in the sagittal alignment of the spine with lumbar degenerative disease. Patients were divided into four groups based on spinopelvic balance and thoracic compensation. The results showed that this classification was consistent with age, compensation abilities, and clinical parameters. This classification potentially represents a valuable tool for comprehensive analysis of lumbar degenerative disease before surgical treatment considering sagittal balance.
JOURNAL OF ORTHOPAEDIC SCIENCE
(2023)
Article
Biology
Brittany Stott, Mark Driscoll
Summary: The geometric alignment of the spine affects stability, biomechanical loading, and pain. Variations in sagittal curvature can lead to different load distributions and range of motion. Finite element modeling reveals that excessive curvatures result in greater stress and reduced disc height, while straighter spines reduce stress. Considering patient-specific sagittal profiles in biomechanical analyses and treatments can provide valuable insights.
COMPUTERS IN BIOLOGY AND MEDICINE
(2023)
Article
Anatomy & Morphology
Joseph F. Baker
Summary: This study aimed to define the relationship between pelvic incidence (PI) and segmental vertebral body lordosis through childhood. It found that as children age, the correlation between PI and segmental lordosis at each level of the lumbar spine becomes stronger, and the relationship between PI and lordosis trends toward that seen in the adult. Future work should aim to determine when the adult PI-LL relationship is realized.
Article
Multidisciplinary Sciences
Yang Li, Jianmin Sun, Guodong Wang
Summary: The retrospective study on asymptomatic adult volunteers found that lumbar lordosis morphology is influenced by pelvic incidence and paraspinal muscle. Proximal lumbar lordosis has a stronger correlation with pelvic incidence compared to distal lumbar lordosis.
SCIENTIFIC REPORTS
(2021)
Article
Multidisciplinary Sciences
Akihiko Hiyama, Hiroyuki Katoh, Daisuke Sakai, Masato Sato, Masahiko Watanabe
Summary: This study found that preoperative sagittal misalignment does not significantly affect the correction of alignment after lateral lumbar interbody fusion (LLIF) surgery in patients with lumbar degenerative diseases. However, postoperative low back pain, leg pain, and leg numbness may be improved regardless of the preoperative sagittal alignment.
SCIENTIFIC REPORTS
(2022)
Article
Clinical Neurology
Ki Young Lee, Jung-Hee Lee, Sang-Kyu Im
Summary: The study evaluated optimal target values for spine balance correction in elderly patients with adult spinal deformity over 60 years old. Risk factors for postoperative sagittal imbalance were identified as pelvic incidence (PI), lumbar lordosis (LL), and post pelvic tilt ratio (PTr), with target values suggested as PI-LL <1.33 and PTr <25.95%. These findings can serve as effective guidelines for spine surgeons performing reconstruction surgeries for elderly patients with sagittal imbalance.
Article
Clinical Neurology
Tanvir Johanning Bari, Martin Heegaard, Rachid Bech-Azeddine, Benny Dahl, Martin Gehrchen
Summary: The study found that hypolordotic lordosis maldistribution (LDI < 50) in instrumented lumbar fusion surgery was associated with an increased risk of revision surgery, increased postoperative pelvic tilt and pelvic incidence minus lumbar lordosis mismatch. Lordosis distribution should be carefully considered prior to spinal fusion, especially in patients with high pelvic incidence.
Article
Biophysics
S. Naserkhaki, N. Arjmand, A. Shirazi-Adl, F. Farahmand, M. El-Rich
JOURNAL OF BIOMECHANICS
(2018)
Article
Biophysics
Tao Liu, Kinda Khalaf, Sadegh Naserkhaki, Marwan El-Rich
JOURNAL OF BIOMECHANICS
(2018)
Article
Biophysics
Mohammad Nikkhoo, Jaw-Lin Wang, Mohamad Parnianpour, Marwan El-Rich, Kinda Khalaf
JOURNAL OF BIOMECHANICS
(2018)
Article
Biophysics
Rizwan Arshad, Lorenza Angelini, Thomas Zander, Francesca Di Puccio, Marwan El-Rich, Hendrik Schmidt
JOURNAL OF BIOMECHANICS
(2018)
Article
Engineering, Biomedical
Hooman Shirzadi, Hassan Zohoor, Sadegh Naserkhaki
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE
(2018)
Article
Biophysics
Tao Liu, Kinda Khalaf, Samer Adeeb, Marwan El-Rich
JOURNAL OF BIOMECHANICS
(2019)
Article
Biophysics
Farshid Ghezelbash, Hendrik Schmidt, Aboulfazl Shirazi-Adl, Marwan El-Rich
JOURNAL OF BIOMECHANICS
(2020)
Article
Biophysics
Mohammad Nikkhoo, Zahra Khoz, Chih-Hsiu Cheng, Chi-Chien Niu, Marwan El-Rich, Kinda Khalaf
JOURNAL OF BIOMECHANICS
(2020)
Article
Computer Science, Interdisciplinary Applications
Meredith Stadnyk, Tao Liu, Fatemeh Fallahi Arezodar, Lindsey Westover, Jaime A. Carvajal Alba, Edward Masson, Lauren Beaupre, Jacob L. Jaremko, Marwan El-Rich
MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING
(2020)
Article
Multidisciplinary Sciences
Jonathan Bourget-Murray, Ashish Taneja, Sadegh Naserkhaki, Marwan El-Rich, Samer Adeeb, James Powell, Kelly Johnston
Summary: This study used finite element analysis to investigate the biomechanical effects of different femoral neck version angles on Hip Resurfacing Arthroplasty. The results showed that femoral retroversion increases impingement and joint contact pressure, while increasing acetabular inclination can reduce impingement but leads to higher joint contact pressure.
Article
Chemistry, Analytical
Rajan Prasad, Marwan El-Rich, Mohammad I. I. Awad, Sunil K. K. Agrawal, Kinda Khalaf
Summary: In this study, a novel three degrees of freedom (DOF) lower limb model was proposed to allow hip abduction/adduction motion in the frontal plane and knee and hip flexion/extension motion in the sagittal plane. The feasibility of using bi-planar cable routing to track a bi-planar reference healthy trajectory was investigated with this model, and the optimal locations of the hip cuffs were determined using optimization.
Article
Biology
Tao Liu, Abdul Aziz Hulleck, Marwan El-Rich
Summary: Accurate predictions of spinal loads in subject-specific musculoskeletal models require consideration of inter-individual variability in body segment parameters. This study found that different mass scaling methods resulted in similar muscle and shear forces, but showed differences in compressive forces, particularly for overweight and obese subjects.
COMPUTERS IN BIOLOGY AND MEDICINE
(2023)
Article
Engineering, Biomedical
Mason Kim, Alexandra Trovato, Vinay Prasad, Marwan El-Rich, Sukhvinder Dhillon, Samer Adeeb, Nadr Jomha
COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING-IMAGING AND VISUALIZATION
(2018)
Article
Orthopedics
Alexandra N. Trovato, Troy D. Bornes, Marwan El-Rich, Sukhvinder S. Dhillon, Samer Adeeb, Nadr M. Jomha
JOURNAL OF ORTHOPAEDICS
(2018)
Article
Biophysics
Nathan D. Camarillo, Rafael Jimenez-Silva, Frances T. Sheehan
Summary: This article discusses the statistical dependence between multiple measurements from the same participant and provides recommendations for using these measurements when they are not independent.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
J. Huet, A. -S. Boureau, A. Sarcher, C. Cornu, A. Nordez
Summary: Standard compression in freehand 3D ultrasound induces a bias in volume calculations, but minimal compression and gel pad methods have similar results. With a trained examiner and precautions, the bias can be minimized and become acceptable in clinical applications.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
C. Lariviere, A. H. Eskandari, H. Mecheri, F. Ghezelbash, D. Gagnon, A. Shirazi-Adl
Summary: Recent developments in musculoskeletal modeling have focused on model customization. Personalization of the spine profile may affect estimates of spinal loading and stability. This study investigates the biomechanical consequences of changes in the spinal profile and finds that personalizing the spine profile has medium to large effects on trunk muscle forces and negligible to small effects on spinal loading and stability.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
Luke T. Mattar, Arash B. Mahboobin, Adam J. Popchak, William J. Anderst, Volker Musahl, James J. Irrgang, Richard E. Debski
Summary: Exercise therapy fails in about 25.0% of cases for individuals with rotator cuff tears, and one reason for this failure may be the inability to strengthen and balance the muscle forces that keep the humeral head in the correct position. This study developed computational musculoskeletal models to compare the net muscle force before and after exercise therapy between successfully and unsuccessfully treated patients. The study found that unsuccessfully treated patients had less inferiorly oriented net muscle forces, which may increase the risk of impingement.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
Natsuki Sado, Takeshi Edagawa, Toshihide Fujimori, Shogo Hashimoto, Yoshikazu Okamoto, Takahito Nakajima
Summary: The existing methods for predicting hip and lumbosacral joint centres in Japanese adults are biased and differ between sexes. We propose new regression equations that consider soft-tissue thickness, sex differences, and a height-directional measure, and validate them using leave-one-out cross-validation.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
Peimin Yu, Xuanzhen Cen, Qichang Mei, Alan Wang, Yaodong Gu, Justin Fernandez
Summary: This study aimed to explore the intra-foot biomechanical differences among individuals with chronic ankle instability (CAI), copers, and healthy individuals during dynamic tasks. The study found that copers and CAI individuals had smaller dorsiflexion angles and copers presented a more eversion position compared to healthy participants. Copers also had greater dorsiflexion angles in the metatarsophalangeal joint and more inversion moments in the subtalar joint during certain tasks. These findings can help in designing interventions to restore ankle joint functions in CAI individuals.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
Jon Skovgaard Jensen, Anders Holsgaard-Larsen, Anders Stengaard Sorensen, Per Aagaard, Jens Bojsen-Moller
Summary: This study investigates the biomechanical effects of robot-assisted body weight unloading (BWU) on gait patterns in healthy young adults. The results show that dynamic robot-assisted BWU enables reduced kinetic requirements without distorting biomechanically normal gait patterns during overground walking.
JOURNAL OF BIOMECHANICS
(2024)