This study will evaluate the bio-mechanical and biochemical abnormalities in acute ACL-injured knees over time. Data will be collected through advanced quantitative MR imaging, functional testing, and bio-specimen collection. Researchers will collect this data from the time of baseline visit, which is within 28 days of injury, through the temporal sequence of post-operative or post-injury recovery and return to activity. The hypotheses for this study are (1) that T1ρ and T2 will be significantly elevated in the lateral side of ACL-injured knees immediately after injury (indicating damage caused by initial injury), and will not fully recover at 6-month, 1-year follow ups; (2) that T1ρ and T2 will be significantly elevated in the medial side of ACL-injured knees at 1-year follow-up; and (3) that differences in the bio-marker expression patterns can be correlated with the initial MRI findings, which would provide information regarding the full spectrum of intra-articular pathology and the subsequent clinical outcomes.
This prospective longitudinal study will evaluate the biomechanical and biochemical abnormalities in acute ACL-injured and reconstructed knees through advanced quantitative MR imaging, bio-specimen collection, and functional testing. Researchers will recruit and retain patients with acute ACL tears within 28 days of injury, and follow them longitudinally at 6 weeks, 6 months, and 12 months. Standard of Care MR imaging will be captured at baseline, then a quantitative morphological MRI and quantitative T1ρ and T2 imaging of the injured and contra-lateral knees will be taken within 7 days of baseline, and again at 6 months, and 1 year post-injury or post-surgery. Scans will not take place immediately after surgery because we are not attempting to study the immediate effect of ACL reconstruction. The physical performance testing will not be acquired until 6 months follow-up because patients will have unstable knees. For the 6 healthy volunteers, only an MRI of the right knee will be required at 4 time points - baseline, 6 months, 12 months, and 18 months. The control volunteers will be used as a measure of reproducibility. The control volunteers will not perform any physical performance testing or study questionnaires. The purpose of the six control subjects is to track the reproducibility and physiologic variation in T1p and T2 values in a normal knee. These subjects will complete imaging at four time points, spaced six months apart. The results will help evaluate the expected range of differences in knees without a traumatic injury. This information will assist in the interpretation of values from the patients with ACL injuries as to if any observed variation is outside the expected magnitude for a healthy individual. The control subjects will also help monitor for any changes in the scanner reliability at our site and compared to the other two clinical sites. Phantoms will be scanned each month to aid in this process, and control subjects will add and help ensure that data collection is constant over time.
Study Type
OBSERVATIONAL
Enrollment
89
UCSF Orthopaedic Institute
San Francisco, California, United States
Follow patients with acute ACL tears longitudinally using advanced, quantitative morphological MR imaging.
Patients who are within 28 days of injury will be recruited in order to capture the acute phase of injury. Quantitative morphological MRI and quantitative T1p and T2 imaging of the injured and contra-lateral knees will be captured at their baseline visit (within 7 days of initial visit), and then again at 6 months and 12 months. The aim is to investigate longitudinal changes in cartilage matrix in ACL-injured and reconstructed knees using T1ρ and T2. We hypothesize that T1ρ and T2 will be significantly higher in defined sub-compartments of injured knees compared to the contralateral un-injured knees at baseline and follow-ups. Meniscus, ligamentous and cartilage abnormalities will be graded using MRI for correlation with cartilage T1ρ and T2.
Time frame: Baseline - 12 months
Collect and store bio-specimens
Blood, urine, and synovial fluid will be collected from patients at each time point (initial visit; surgery (if applicable); 6 weeks post-injury (or post-surgery, if applicable), 6 months, and 12 months). The aim is to collect, freeze, and store these samples from each time point to develop a repository of bio-specimens, which can be correlated with imaging, clinical and functional outcomes at a later phase when funding becomes available for such assays. The hypothesis is that differences in the bio-marker expression patterns can be correlated with the initial MRI findings, which provide information regarding the full spectrum of intra-articular pathology, and the subsequent clinical outcomes.
Time frame: Baseline - 12 months
Functional Assessments
Physical performance and functional testing will only be preformed at 6 months and 1-year, and not during the initial visits due to functional limitations. Subjects will perform the "One-Legged Hop Tests" and the "Star Excursion Balance Test (SEBT)". The aim of the functional testing is to demonstrate the feasibility of relating the MRI derived morphological and biochemical measures to clinical and functional assessments.
Time frame: 6 months, 12 months
Patient-Reported Questionnaires
In addition to demographic data, the activity level of all subjects will be evaluated using the Lysholm questionnaire. Pre- and post-injury/post-operative SF-36 and IKDC evaluations will be performed to document the patient's objective and subjective complaints. Knee Injury and Osteoarthritis Outcome Score (KOOS), which is specifically used for knee injuries that result in post-traumatic OA, will be evaluated in all subjects, including 5 subscales: pain, other symptoms, function in daily living ADL, function in sports and recreation, and knee-related quality of life. The aim is to demonstrate the feasibility of relating the longitudinally acquired, novel imaging measures to the clinical outcomes as assessed by patient-reported questionnaires, and assess the magnitude and types of OA features developed over time at multiple centers.
Time frame: Baseline - 12 months
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