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Anterolateral structure (ALS) injury is significant risk factor for grade 3 pivot shift in knees with acute ACL injuries
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This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:

"Among patients undergoing ACL reconstruction surgery, a high-grade pivot shift before surgery is widely considered to confer an increased risk of graft rupture and persistent instability after surgery. But what are the risk factors for high-grade pivot shifts themselves? A new study published in The American Journal of Sports Medicine reports injury to anterolateral structures as the most important risk factor for high-grade pivot shifts in patients suffering ACL injuries. The pivot shift test is the most specific physical exam for diagnosing ACL injuries. The examiner applies inward pressure on the lateral thigh with one hand while internally rotating the lower leg as the knee is flexed from a fully extended position. The presence of a pivot shift is indicated by an abrupt forward shift of the tibia back to its normal anatomical position. This shift is graded between 1 and 3 according International Knee Documentation Committee criteria, with 1 and 2 considered low grade, and 3 considered high grade..."

The rest of the transcript, along with a link to the research itself, is available on the resource itself.

Subject:
Applied Science
Health, Medicine and Nursing
Material Type:
Diagram/Illustration
Reading
Provider:
Research Square
Provider Set:
Video Bytes
Date Added:
10/23/2020
Design of Medical Devices and Implants
Conditional Remix & Share Permitted
CC BY-NC-SA
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This design course targets the solution of clinical problems by use of implants and other medical devices. Topics include the systematic use of cell-matrix control volumes; the role of stress analysis in the design process; anatomic fit, shape and size of implants; selection of biomaterials; instrumentation for surgical implantation procedures; preclinical testing for safety and efficacy, including risk/benefit ratio assessment evaluation of clinical performance and design of clinical trials. Student project materials are drawn from orthopedic devices, soft tissue implants, artificial organs, and dental implants.

Subject:
Applied Science
Biology
Engineering
Life Science
Material Type:
Full Course
Provider:
MIT
Provider Set:
MIT OpenCourseWare
Author:
Spector, Myron
Yannas, Ioannis
Date Added:
02/01/2006
Early ACL repair surgery delays secondary meniscal injury compared with no or delayed surgery
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CC BY
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This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:

"A new study suggests that early ACL reconstruction surgery delays secondary injury to the knee meniscus compared with delayed surgery or nonsurgical treatment. The findings are published in _The_ _American Journal of Sports Medicine_. The anterior cruciate ligament, or ACL, is an important stabilizing structure in the knee. Injury to the ACL places additional stress on neighboring knee structures, such as the meniscus, increasing the risk of secondary injury. However, it’s unclear whether the type and timing of ACL reconstruction affect the risk of subsequent meniscal injury. To find out, researchers recently used machine learning to compare the risk and timing of secondary meniscal injury among patients whose ACL injuries were treated nonsurgically, with early reconstruction surgery, or with delayed reconstruction surgery. There was no significant difference in the overall occurrence of secondary meniscal injury in the patients who were treated with versus without surgery..."

The rest of the transcript, along with a link to the research itself, is available on the resource itself.

Subject:
Applied Science
Health, Medicine and Nursing
Material Type:
Diagram/Illustration
Reading
Provider:
Research Square
Provider Set:
Video Bytes
Date Added:
01/31/2023
For young athletes undergoing ACL reconstruction, age may be key to surgical success
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This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:

"Many factors influence recovery from surgical ACL reconstruction, and defining these is key to achieving the best outcomes. While the elements linked to surgical success in adult populations are well defined, they aren’t so clear for younger patients. New research from the Hospital for Special Surgery in New York suggests that for these patients, age matters when it comes to protecting the knee. That conclusion stems from an evaluation of 324 athletes under 20 years of age who underwent ACL reconstruction following a sports injury. A key consideration when operating on this group is minimizing the risk of growth disturbances. Children and young adolescents haven’t reached skeletal maturity, which has led to the development of age-specific surgical techniques. Researchers compared several of these approaches among groups divided based on skeletal age, school age distribution, surgical technique, and graft selection. Clinical follow-up was performed for at least 2 years..."

The rest of the transcript, along with a link to the research itself, is available on the resource itself.

Subject:
Applied Science
Health, Medicine and Nursing
Material Type:
Diagram/Illustration
Reading
Provider:
Research Square
Provider Set:
Video Bytes
Date Added:
09/20/2019
Kaplan fiber injury not correlated with high-grade pivot shift in ACL injury
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This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:

"One of the goals of ACL reconstruction surgery is to eliminate anterolateral rotational laxity of the knee. Biomechanical studies have shown that rotational control of the knee is largely controlled by the iliotibial band—specifically, the Kaplan fibers that anchor the band to the distal femur. Despite this critical connection, it remains unclear how often the iliotibial band and Kaplan fibers are compromised in association with ACL injury. To find out, researchers examined data for 267 patients with ACL-injured knees undergoing reconstruction surgery. They analyzed MRI scans to determine the extent of Kaplan fiber injury, and correlated those findings with the grade of pivot shift reported by the surgeon before the procedure. Only 47 patients, or approximately 18% of all patients, showed a Kaplan fiber injury. The majority of patients in the intact and injured Kaplan fiber groups had a grade-2 pivot shift. While only about 5% of all patients had a grade-3 pivot shift..."

The rest of the transcript, along with a link to the research itself, is available on the resource itself.

Subject:
Applied Science
Health, Medicine and Nursing
Material Type:
Diagram/Illustration
Reading
Provider:
Research Square
Provider Set:
Video Bytes
Date Added:
10/11/2021
Mechanical loading induces ACL hypertrophy
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This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:

"Can athletes’ ACLs be “trained” to resist injury? A new study published in The American Journal of Sports Medicine suggests that it’s possible. Studies on animals have shown that exercise during growth periods like puberty can “bulk up” the ACL, increasing its size and improving its mechanical properties. However, evidence of so-called “ACL hypertrophy” in human athletes is scarce. To address this gap, researchers examined the knees of 52 athletes who had been skating or diving since before puberty or since puberty onset. These types of athletes always land or jump up using the same leg, which the researchers labeled as the “dominant leg,” and thus habitually load one knee more than the other while training for their sport. Specifically, the team compared ACL and patellar tendon dimensions and knee strength between the left and right knees. They also examined how differences in ACL dimensions between knees correlated with age at training onset and with the number of years of training..."

The rest of the transcript, along with a link to the research itself, is available on the resource itself.

Subject:
Applied Science
Health, Medicine and Nursing
Material Type:
Diagram/Illustration
Reading
Provider:
Research Square
Provider Set:
Video Bytes
Date Added:
10/12/2021
Objective assessment of ACL graft status after ACL reconstruction using T2* MRI
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This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:

"The timing of return to play is one of the most critical decisions made following ACL reconstruction. Returning too early carries the risk of graft failure, while returning too late could cost patients financial and athletic opportunities. Unfortunately, no universal, objective method exists to determine the best time for athletes to resume full activities. But according to a new study reported in The American Journal of Sports Medicine, such methods could be on the horizon, with the help of MRI technology. One promising marker for estimating the best time for athletes to return to play is ACL graft maturation. That’s the process by which a surgical graft makes the transformation from tendon tissue into a substance similar to a normal ACL. The problem is that this transformation is difficult to track over time. Tissue biopsies are currently the gold standard, but are invasive and, in most cases, impractical to perform..."

The rest of the transcript, along with a link to the research itself, is available on the resource itself.

Subject:
Anatomy/Physiology
Applied Science
Health, Medicine and Nursing
Life Science
Material Type:
Diagram/Illustration
Reading
Provider:
Research Square
Provider Set:
Video Bytes
Date Added:
10/23/2020
Patterns of knee injury among bouldering and rock-climbing athletes
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This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:

"Rock climbing is one of the fastest-growing sports on the planet. The upcoming 2020 Olympics in Japan will be the first to feature climbing as one of its prestigious events. While research has helped climbers learn how to avoid injuries to their upper body, surprisingly little is known about the effects of climbing on the lower body. Now, for the first time, researchers have discovered patterns of knee injury across both competitive and noncompetitive climbers. Their findings, published in the March issue of The American Journal of Sports Medicine, could offer athletes and healthcare providers useful tips on how to avoid or bounce back from injury. Over a period of 4 years, the authors of the study looked at 71 patients with 77 independent acute knee injuries due to climbing. Athletes were grouped by performance level, either competitive or noncompetitive, and injuries were classified by climbing type, due either to rope climbing or to bouldering, both indoor and outdoor..."

The rest of the transcript, along with a link to the research itself, is available on the resource itself.

Subject:
Applied Science
Health, Medicine and Nursing
Material Type:
Diagram/Illustration
Reading
Provider:
Research Square
Provider Set:
Video Bytes
Date Added:
09/25/2020
Prospective data rule against osteotomy for preventing retear in patients post-ACL reconstruction
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This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:

"For many patients undergoing reconstruction of the ACL, the path toward recovery can be rough. One complication patients face is subsequent graft tear or injury to the opposite knee. In fact, such injuries are reported at rates of 3% at 2 years after surgery, and up to 6% at 5 years. One factor that could contribute to these statistics is anatomy. Some studies have shown that a high posterior tibial slope, or PTS, is a predictor of graft tear or contralateral ACL injury following ACL reconstruction. Others, however, have failed to produce supporting evidence. To explore that relationship, researchers examined more than 2000 ACL reconstructions with patellar tendon autograft, with a mean follow-up of 11.6 years. The PTS was measured prospectively using radiographs by subtracting from 90-degrees the acute angle formed by intersecting lines drawn along the medial tibial plateau and the posterior tibia..."

The rest of the transcript, along with a link to the research itself, is available on the resource itself.

Subject:
Applied Science
Health, Medicine and Nursing
Material Type:
Diagram/Illustration
Reading
Provider:
Research Square
Provider Set:
Video Bytes
Date Added:
10/13/2021
Ramp lesion characteristics in ACL reconstruction patients
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This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:

"ACL injuries are common among athletes of all types. Often, they’re associated with ramp lesions—injuries to the medial meniscus, which cushions the femur and provides stability to the knee joint. Unfortunately, ramp lesions often go undiagnosed, and the most appropriate course of treatment is the subject of much debate. To bridge this gap, researchers examined the prevalence and characteristics of ramp lesions in patients undergoing ACL reconstruction. Their findings are reported in _The American Journal of Sports Medicine_. The team retrospectively evaluated all patients who underwent ACL reconstruction at a hospital in Lyon, France, between November 2015 and November 2018. They used a combination of imaging and surgical techniques to identify whether ramp lesions were present..."

The rest of the transcript, along with a link to the research itself, is available on the resource itself.

Subject:
Applied Science
Health, Medicine and Nursing
Material Type:
Diagram/Illustration
Reading
Provider:
Research Square
Provider Set:
Video Bytes
Date Added:
10/12/2021
Regenerating ACL tears
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This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:

"Tears to the anterior cruciate ligament typically require surgical reconstruction But the operation can cause muscle weakness and doesn’t always restore proprioception or joint kinematics A new biologic augmentation technique may overcome these limitations The technique employs intra-ligamentous and intra-articular infiltration of bone marrow aspirate and platelet-rich plasma to regenerate ACL tears When used in athletes with symptomatic partial ACL injuries the treatment restored both the structure and function of the ligament with fewer complications and a faster recovery than traditional surgery Although a larger cohort must still be tested the results show the potential of biologic augmentation for ACL repair Dallo, et al. Treatment of Anterior Cruciate Ligament Partial Tears Using the Technique of Biologic Augmentation with Bone Marrow Concentrate and Platelet-rich Plasma Under Arthroscopic Visualization: Preliminary Outcomes with 2 year follow-up..."

The rest of the transcript, along with a link to the research itself, is available on the resource itself.

Subject:
Applied Science
Health, Medicine and Nursing
Material Type:
Diagram/Illustration
Reading
Provider:
Research Square
Provider Set:
Video Bytes
Date Added:
09/23/2019
Second ACL reconstruction vs. nonsurgical management: Both are associated with a high return to sport, but a second surgery may yield better knee function
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CC BY
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This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:

"A new study suggests that after failure of revision ACL reconstruction, a second revision surgery results in better knee function than nonsurgical management—although both treatment strategies are associated with a high rate of return to sport. The findings are published in The American Journal of Sports Medicine. Tearing of the anterior cruciate ligament, or ACL, is a common sports injury. It’s usually treated with ACL reconstruction surgery. However, in some patients, particularly young and active patients, the surgical graft ruptures and requires revision ACL reconstruction. And a subset of these patients experience another rupture after the revision. It has remained unclear whether a second revision ACL reconstruction or nonsurgical management results in better outcomes for these patients. To find out, the new study followed 41 patients with a failed first revision ACL reconstruction, 31 of whom underwent a second revision surgery and 10 of whom chose nonsurgical management..."

The rest of the transcript, along with a link to the research itself, is available on the resource itself.

Subject:
Applied Science
Health, Medicine and Nursing
Material Type:
Diagram/Illustration
Reading
Provider:
Research Square
Provider Set:
Video Bytes
Date Added:
01/31/2023
To repair or not to repair: A biomechanics study of  meniscal ramp lesions
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CC BY
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This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:

"Recent studies have shown that all-inside repair of meniscal ramp lesions can restore normal knee motion. But it has remained unclear how ramp lesion repairs affect ACL in situ forces and bony contact forces. To remedy that, researchers from the University of Pittsburgh recently used a robotic system to examine these forces in intact knees, knees with ramp lesions, and knees with ramp lesion repairs. Their findings, reported in the November issue of the American Journal of Sports Medicine, suggest that the indications for ramp lesion repair may be limited. The team looked at nine knees from human cadavers, each tested using a six-degree-of-freedom robotic system. The knees were continuously flexed from full extension to 90° under five different loads: an anterior load, an external-rotation torque, a combined anterior and compression load, and a combination of external- or internal-rotation torque and compression..."

The rest of the transcript, along with a link to the research itself, is available on the resource itself.

Subject:
Anatomy/Physiology
Applied Science
Health, Medicine and Nursing
Life Science
Material Type:
Diagram/Illustration
Reading
Provider:
Research Square
Provider Set:
Video Bytes
Date Added:
12/23/2019