Mario Lamontagne | University of Ottawa | Université d'Ottawa (original) (raw)

Papers by Mario Lamontagne

Scientific reports, Feb 1, 2024

CMBES Proceedings, Nov 24, 2017

ISBS - Conference Proceedings Archive, Mar 2, 2008

ISBS Proceedings Archive, 2017

The Journal of Knee Surgery, 2021

Few studies have assessed knee range of motion (ROM) and moments of patients with mobile-bearing ... more Few studies have assessed knee range of motion (ROM) and moments of patients with mobile-bearing unicompartmental knee arthroplasty (MB UKA) during active deep flexion activities. We analyze knee kinematic and kinetic parameters during postoperative squatting-standing activity, aiming to evaluate the efficacy of MB UKA and postoperative rehabilitation progress. This was a clinical cohort study. We followed up with 37 patients diagnosed with medial knee osteoarthritis (OA) with primary UKA. After screening 31 patients were recruited to take gait tests. Squatting-standing activities were performed under the test of 10-camera motion analysis system and force plates preoperatively at different stages after UKA (12, 18, and 24 months). The average duration of follow-up was 24.4 months (from 22.8 to 26.7 months). Hip-knee-ankle angle improved significantly compared with pre-UKA as well as scores of American Knee Society Score, numeric rating scale, ORS, and Western Ontario and McMasters. ...

Journal of Bone and Joint Surgery, 2017

Background: Cam morphology in association with femoroacetabular impingement (FAI) is a recognized... more Background: Cam morphology in association with femoroacetabular impingement (FAI) is a recognized cause of hip pain and cartilage damage and proposed as a leading cause of arthritis. The purpose of this study was to analyze the functional and biomechanical effects of the surgical correction of the cam deformity on the degenerative process associated with FAI. Methods: Ten male patients with a mean age of 34.3 years (range, 23.1 to 46.5 years) and a mean body mass index (and standard deviation) of 26.66 ± 4.79 kg/m2 underwent corrective surgery for cam deformity in association with FAI. Each patient underwent a computed tomography (CT) scan to assess acetabular bone mineral density (BMD), high-resolution T1ρ magnetic resonance imaging (MRI) of the hips to assess proteoglycan content, and squatting motion analysis as well as completed self-administered functional questionnaires (Hip disability and Osteoarthritis Outcome Score [HOOS]) both preoperatively and 2 years postoperatively. Re...

Journal of Bone Joint Surgery British Volume, Nov 1, 2011

Journal of Orthopaedic Research®, 2018

The purpose of this study was to investigate the effect of fatigue in knee biomechanics in female... more The purpose of this study was to investigate the effect of fatigue in knee biomechanics in female handball athletes during the sidestep cutting and single-leg landing. Twenty female handball athletes participated in this study. The fatigue protocol was composed of specific handball movements/actions. The participants performed three trials of the sidestep cutting and single-leg drop landing before (baseline) and after the fatigue protocol. The effect of the fatigue was compared using a paired t-test compared using statistical parametric mapping. During sidestep cutting, the athletes performed the task with lower knee flexion and greater knee abduction during the fatigue state. During the single-leg landing, an increase in the knee valgus was found during the fatigue state. No difference was found on knee kinetics. The fatigue impacted the knee kinematics decreasing the knee flexion during the sidestep cutting and increasing the knee valgus during both, sidestep cutting and single-le...

Journal of Bone and Joint Surgery-british Volume, 2016

With the growing number of individuals with asymptomatic cam-type deformities, elevated alpha ang... more With the growing number of individuals with asymptomatic cam-type deformities, elevated alpha angles alone do not always explain clinical signs of femoroacetabular impingement (FAI). Differences in additional anatomical parameters may affect hip joint mechanics, altering the pathomechanical process resulting in symptomatic FAI. The purpose was to examine the association between anatomical hip joint parameters and kinematics and kinetics variables, during level walking. Fifty participants (m = 46, f = 4; age = 34 ± 7 years; BMI = 26 ± 4 kg/m²) underwent CT imaging and were diagnosed as either: symptomatic (15), if they showed a cam deformity and clinical signs; asymptomatic (19), if they showed a cam deformity, but no clinical signs; or control (16), if they showed no cam deformity and no clinical signs. Each participant9s CT data was measured for: axial and radial alpha angles, femoral head-neck offset, femoral neck-shaft angle, medial proximal femoral angle, femoral torsion, acetab...

Journal of biomechanical engineering, 2017

The choice of marker set is a source of variability in motion analysis. Studies exist which asses... more The choice of marker set is a source of variability in motion analysis. Studies exist which assess the performance of marker sets when direct kinematics is used, but these results cannot be extrapolated to the inverse kinematic framework. Therefore, the purpose of this study was to examine the sensitivity of kinematic outcomes to inter-marker set variability in an inverse kinematic framework. The compared marker sets were plug-in-gait, University of Ottawa motion analysis model and a three-marker-cluster marker set. Walking trials of 12 participants were processed in opensim. The coefficient of multiple correlations was very good for sagittal (>0.99) and transverse (>0.92) plane angles, but worsened for the transverse plane (0.72). Absolute reliability indices are also provided for comparison among studies: minimum detectable change values ranged from 3 deg for the hip sagittal range of motion to 16.6 deg of the hip transverse range of motion. Ranges of motion of hip and knee ...

Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society Volume 13: 1991

The present investigation involves the validation of a technique for the determination of the mom... more The present investigation involves the validation of a technique for the determination of the moment of inertia of human lower leg and of the damping coefficient of the knee joint. A method based upon the theory of small damped oscillations of a system about its equilibrium position is used to measure the moment of inertia of human lower leg. This method, in contrast with the others, is simple and does not require highly sophisticated instrumentation. The validation of this method is performed using a cylinder of known moment of inertia and the small oscillation apparatus (SOA). The results obtained were highly reproducible, however, the average difference between the known moment of inertia and that measured was less than 15%.

The American Journal of Sports Medicine, 1997

We studied six expert downhill skiers who had sus tained anterior cruciate ligament injuries and ... more We studied six expert downhill skiers who had sus tained anterior cruciate ligament injuries and had dif ferent degrees of knee instability. The aim was to measure possible changes in electromyographic activ ity recorded from lower extremity muscles during downhill skiing in a slalom course without and with a custom-made brace applied to the injured knee. Sur face electrodes were used with an eight-channel tele metric electromyographic system to collect recordings from the vastus medialis, biceps femoris, semimem branosus, semitendinosus, and gastrocnemius media lis muscles from both legs. Without the brace, the electromyographic activity level of all muscles in creased during knee flexion. The biceps femoris mus cle was the most activated and reached 50% to 75% of the maximal peak amplitude. With the brace, the elec tromyographic activity increased in midphase during the upward push for the weight transfer and the peak activity occurred closer to knee flexion in midphase. Also, the...

INTRODUCTION Knee braces have been found to provide limited stability to the ACL deficient (ACLD)... more INTRODUCTION Knee braces have been found to provide limited stability to the ACL deficient (ACLD) knee in situations where the knee is loaded during sporting movements [1,3]. The increased laxity in the joint requires the patient’s body to compensate for the ACLD by also altering muscle recruitment patterns, such as the hamstrings and quadriceps to adequately stabilize the knee during such activities [4,5]. Different adaptation strategies have been found between patients that can cope with the injury and patients that cannot. One of the expected changes can be muscle activation characteristics of the injured knee during strenuous activity with and without a functional knee brace.

INTRODUCTION: Orthopedic surgeons rely on patient-reported outcome measures (PROMs) to evaluate w... more INTRODUCTION: Orthopedic surgeons rely on patient-reported outcome measures (PROMs) to evaluate whether one treatment is better than another. PROMs can be classified as either "general" (e.g., SF-36) or "disease" (e.g., WOMAC) specific, and these measures are often combined by the surgeons' clinical assessment, which often includes patient's imaging for alignment and joint function 1. Scientific literature reports inconsistencies between PROMs and clinical-based outcomes. Although PROMs are easy to administer, their qualitative design and common ceiling effects severely limit its validity 2. Biomechanical/functional analysis, which includes the motion, forces, and muscle activity can provide both the researcher and clinician with objective evidence into joints functional performance before and after a surgery by including the joint motion, the forces causing these motions and the muscles that are being activated 3. Objective measurements are necessary to assess the effectiveness of patient's functional performance. The purpose of this presentation is to describe various biomechanical analysis procedures and their outcomes to help the orthopedic surgeons to make an informed clinical decision. METHODS: One of the most common methods of data analysis in biomechanics consists of measuring gait parameters such as walking speed, stride length and cadence among others. This method provides gait performance but limited information about the joint biomechanics. A more advanced motion analysis of gait consists of measuring several relevant discrete kinematics and kinetics variables, such as peak and range of motion of joint angles, moment and power and sometimes peak values and total muscle activity together with a statistical hypothesis test to measure differences between groups. This more advanced data analysis cannot capture the complexity of these relationships. More complex data analyses for gait would use time-waveform analysis, which compares kinematics and kinetics variables across the entire waveform of the motion cycle. Examples of time-waveform analysis would be principal component analysis (PCA) and statistical parametric mapping (SPM). PCA is an algebraic algorithm that aims at reducing all of the variables of interest into a set of new variables or "components" that sufficiently captures the observed total variation of the original variables 4. SPM provides topological analysis of smooth continuum changes 5. It compares the entire time-waveform for biomechanical variables between two groups. The benefit of SPM is that statistical differences are presented directly in the original sampling space-time so their spatiotemporal biomechanical context is immediately apparent and removes the assumptions regarding the spatiotemporal foci of signals 5 .

Journal of Functional Morphology and Kinesiology, 2021

Electromyography (EMG) onsets determined by computerized detection methods have been compared aga... more Electromyography (EMG) onsets determined by computerized detection methods have been compared against the onsets selected by experts through visual inspection. However, with this type of approach, the true onset remains unknown, making it impossible to determine if computerized detection methods are better than visual detection (VD) as they can only be as good as what the experts select. The use of simulated signals allows for all aspects of the signal to be precisely controlled, including the onset and the signal-to-noise ratio (SNR). This study compared three onset detection methods: approximated generalized likelihood ratio, double threshold (DT), and VD determined by eight trained individuals. The selected onset was compared against the true onset in simulated signals which varied in the SNR from 5 to 40 dB. For signals with 5 dB SNR, the VD method was significantly better, but for SNRs of 20 dB or greater, no differences existed between the VD and DT methods. The DT method is r...

Clinical Biomechanics, 2021

BACKGROUND Osteochondroplasty for cam femoroacetabular impingement is a common treatment to impro... more BACKGROUND Osteochondroplasty for cam femoroacetabular impingement is a common treatment to improve hip function and prevent joint degeneration. The purpose was to compare in-silico hip biomechanics during stair tasks in pre- and postoperative patients matched with healthy controls. METHODS Ten symptomatic cam femoroacetabular impingement patients performed stair ascent and descent pre- and 2 years postoperatively. Patients were age, and body-mass-index matched to controls. Full-body kinematics and kinetics were computed and, muscle and hip contact forces were estimated using musculoskeletal modeling and static optimization. Stance-phases were time-normalized and compared using statistical non-parametric mapping. FINDINGS Preoperatives showed lower hip abduction than controls during stairs ascent (76-100%, P = .007). Pre- and postoperative showed lower hip external rotation compared to controls on stair ascent (Pre-op vs controls: 71-100%, P = .005; Post-op vs controls: 72-100%, P = .01) and stair descent (Pre-op vs controls: 0-62%, P = .001; Post-op vs controls: 0-60%, P = .001). Postoperatives showed lower iliacus force compared to preoperative (1-3%, P = .012) and control (3-6%, P = .008), and higher gluteus maximus and piriformis forces compared to controls during stair descent. Lower postoperative anterior hip contact force (0-7%, P = .004) during descent, and superior (33-35%, P = .018) during ascent compared to controls were observed. Postoperative contact forces were medialized compared to preoperative (0-2%, P = .011) and controls (1-2%, P = .016). INTERPRETATION Forcing participants to adhere to standardized step length/rise minimized sagittal kinematic differences between conditions and groups. Persistent reduced hip external rotation postoperatively and minor muscle force adaptations led to reduced superior hip contact force during stair ascent and reduced anterior and more medialized contact forces during stair descent.

Clinical Orthopaedics & Related Research, 2008

Femoroacetabular impingement (FAI) causes abnormal contact at the anterosuperior aspect of the ac... more Femoroacetabular impingement (FAI) causes abnormal contact at the anterosuperior aspect of the acetabulum in activities requiring a large hip range of motion (ROM). We addressed the following questions in this study: (1) Does FAI affect the motions of the hip and pelvis during a maximal depth squat? (2) Does FAI decrease maximal normalized squat depth? We measured the effect of cam FAI on the 3-D motion of the hip and pelvis during a maximal depth squat as compared with a healthy control group. Fifteen participants diagnosed with cam FAI and 11 matched control participants performed unloaded squats while 3-D motion analysis was collected. Patients with FAI had no differences in hip motion during squatting but had decreased sagittal pelvic range of motion compared to the control group (14.7 ± 8.4°versus 24.2 ± 6.8°, respectively). The FAI group also could not squat as low as the control group (41.5 ± 12.5% versus 32.3 ± 6.8% of leg length, respectively), indicating the maximal depth squat may be useful as a diagnostic exercise. Limited sagittal pelvic ROM in FAI patients may contribute to their decreased squatting depth, and could represent a factor amongst others in the pathomechanics of FAI. Level of Evidence: Level III, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.