Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 54 for “"laxity"”.
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Total Knee Arthroplasty Wear Is Caused by Malrotation and Excessive Laxity
… to this wear. To accomplish this aim, a custom laxity machine was used to assess joint stability in 20 knees of human bodies donated to science. This laxity data was compared to damage scores expressing the amount of wear on each implant specimen, and was used in conjuction with alignment data …
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Laxity of the Hip Capsule in Natural and Posteriorly Implanted Specimens
… is minimized. Large differences in capsular laxity between natural and implanted specimens were observed, particularly with an increased adduction torque resistance and a reduced internal rotation torque resistance in implanted specimens. Broad variability was observed across specimens …
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The accuracy of clinical examination of rotational and sagittal laxity of the knee
… and reliability of clinical examination for knee laxity in degrees and millimetres when compared to movement measured by computer-assisted navigation. Methods: A cadaver lower limb was connected to a computer assisted knee surgery system (CAS) and calibrated through a mini medial parapatellar …
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Neural and Collagen Tissue Properties As They Relate to Glenohumeral Joint Laxity and Stiffness
… a traumatic event that leads to excessive joint laxity. A major concern with instability is the high recurrence rate post treatment. Although the occurrence and recurrence of instability are primarily associated with capsule and labrum injury, the tissue characteristics of the capsule and labrum …
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A Comparison of Strength, ROM, Laxity, and Dynamic and Static Postural Control Between Those At-Risk and Healthy
… this study were to compare strength, ankle joint laxity, ankle dorsiflexion range of motion (DF-ROM), and static balance between individuals with poor and good performance on the Star Excursion Balance Test in the anterior reach direction (SEBT-A), as well as to identify what combination of …
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Design and in vivo verification of a stress radiography device towards it's suitability for multi-ligament laxity measurements
… joint include decreased joint integrity, hyperlaxity, abrupt locking and catching combined with clicking noises during locomotion. Approximately, two hundred and fifty thousand ACL injuries occur in the United States of America annually. Current diagnostic procedures are subjective according to …
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Rotational laxity of the knee following reconstruction of the anterior cruciate ligament using single vs double-bundle surgery
Includes abstract. Includes bibliographical references (leaves 172-196).
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Further development of a non-invasive infra-red (IR) system in clinical assessment of knee laxity in healthy volunteers
… Implementing these tools into an altered laxity assessment, two measurements of varus and valgus laxity, and AP translation were taken at 5°, 15°, 30° & 45° intervals. Valgus measurements were repeatable (CR 3°) between 5° and 15° of flexion, varus measurements were repeatable at 5°. The …
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Changes in joint laxity associated with the menstrual cycle, with pregnancy, with the post-partum period, and with the menopause
This thesis looks at changes in joint laxity associated with the menstrual cycle, pregnancy, and the menopause and the potential contribution of female hormones to that laxity. A pilot study revealed that there was a potential link between the phases of the menstrual cycle and the onset of …
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A Comparison of Strength, ROM, Laxity, and Static and Dynamic Postural Control Between Ankle Copers and Patients With Chronic Ankle Instability
… CAI and healthy individuals. Increased ankle laxity and diminished strength, ankle range of motion (ROM), and static and dynamic postural control have consistently characterized persons with CAI. The second purpose of this study was to determine which measures best predict SEBT performance in …
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Failure of Primary Total Knee Arthroplasty: Establishing a Baseline for Retrieval Analysis Using Well-Functioning Necropsy Specimens
… investigate the relationship between soft tissue laxity, inflammatory cytokine concentrations, tissue metal concentrations, and wear scores of well-functioning implants retrieved from cadaveric specimens to determine the role of each of these factors in implant survivorship. It was hypothesized …
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The Effects of Tibiofemoral Conformity on the Kinematic Freedom of Revision Total Knee Arthroplasty Systems
… describe the tibiofemoral kinematics and passive laxity envelope of three contemporary revision knee systems in a controlled setting and relate those differences to design characteristics. Methods Twelve cadaveric knees (age: 69.5±18.5 years, BMI 25.3±4.3) were implanted with a DePuy Synthes …
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The Effects of Oral Contraceptive Use on Ligamentous Injury Incidence in Females: A Potential for Prevention
… Increased serum estrogen levels increase ACL laxity and potentially are to blame for an increased injury risk. Estrogen receptors located within human ACL fibroblasts, when activated, decrease collagen production, which leads to decreased ligament strength and increased laxity. Estrogen levels …
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Computational Modeling to Predict Mechanical Function of Joints: Validations and Applications of Lower Leg Simulations
… study, inversion stability study, and mechanical laxity study) and one simultaneously performed cadaver study (anterior drawer test).In the syndesmotic injury study, the relative motion between the tibia and fibula in intact, transected, and repaired states was measured under the application of an …
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An Observational study of changes in cervical inter-vertebral motion and the relationship with patient-reported outcomes in patients undergoing spinal manipulative therapy for neck pain.
… axis of rotation (IAR) location, and laxity/attainment rate. The acquisition protocol allowed for imaging sequences to be achieved in a manner acceptable to participants. QF was found to be accurate to 0.5° for rotational range of motion. Intra- and inter-observer repeatability studies …
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An Examination of Contributing Factors to Star Excursion Balance Test in Individuals with and without Chronic Ankle Instability
… dorsiflexion range of motion (DFROM), and ankle laxity between individuals with and without chronic ankle instability (CAI) as well as to determine which factors contribute the most to Star Excursion Balance Test (SEBT) performance in the CAI and healthy control groups. Design: A case-control …
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In Vitro Investigations of Conventional vs. Robotic-Assisted Total Knee Arthroplasty
… (IE) rotation and varus/valgus (VV) rotation laxity was assessed at discrete flexion angles and evaluated against a cohort of intact knees. No differences were found in IE or VV rotation laxity at any flexion angle between cohorts. Then, joint kinematics were evaluated across simulated …
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Anterior Cruciate Ligament Elasticity and Force for Knee Flexion during the Menstrual Cycle in Women
… have been conducted on changes of knee ligament laxity during the menstrual cycle (MC) since there are more injuries in certain phases. Some researchers believe that since estrogen receptor β exists in ligaments and tendons in the knee, estrogen may modulate towards a state of laxity. However, …
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In Vivo Data Capture Using HSSR for Calibration of Computational Models
… of computational models. A leg press, and a knee laxity apparatus, were designed, built, and validated for use with HSSR for in vivo subject-specific data collection.</p>
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Changes in Neuromuscular Performance Throughout the Menstrual Cycle in Physically Active Females
… 60°/sec, 180°/sec, and 300°/sec, and knee joint laxity were measured at each visit. Main Outcome Measures: Isokinetic quadriceps strength, KT- 1000 measurements, blood assays. Results: Isokinetic peak torque at 60°/sec was significantly lower during the follicular (151.6 ± 26.8 NM) than during …
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