Week 5 Flashcards
What are the degrees of freedom in the knee joint?
Describe menisci and their function
Where are the meniscal attachments?
What is the direction of menisci motion with knee flexion?
Explain knee MCL
Explain knee LCL
Explain knee ACL
What are the tiers of knee ligament injuries?
Explain knee PCL
Where is the anteriolateral and posteromedial bundles located?
What does the IT band do?
Explain normal knee joint osteokinematics
Explain functional knee joint osteokinematics
Explain OKC and CKC flexion for the knee joint
Explain OKC and CKC extension for the knee joint
Explain OKC and CKC unlocking (flexion) for the knee joint
Explain OKC and CKC locking (extension) for the knee joint
What are the angles at the knee?
Explain the Q angle
Explain stability and stressors at the patellofemoral joint (PFJ)
What are motions at the PFJ?
What happens to the patella during knee flexion 135, 90, 20?
What is patella alta and baja?
How does the patella move if the tibia is moving?
Does sit to stand transition (STST) mechanics change due to muscle damage?
What type of joint is the hip?
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What are the key anatomical structures in the acetabulum and femur?
What is the labrum?
The labrum is a fibrocartilaginous ring found in the shoulder (glenoid labrum) and hip (acetabular labrum) that plays a key role in joint stability and function. It deepens the socket, increasing joint congruency and reducing the risk of dislocation. Additionally, it acts as a shock absorber, distributes load, and helps maintain negative intra-articular pressure for enhanced stability. The labrum also contains mechanoreceptors that aid in proprioception and joint lubrication. Due to its limited blood supply, labral injuries, such as tears, can lead to pain, instability, and decreased function, often requiring physical therapy or surgical repair depending on severity.
A labral tear in the hip joint disrupts normal arthrokinematics, leading to excessive femoral head translation, instability, and altered glide-roll mechanics. The loss of the labrum’s suction effect increases joint laxity, causing abnormal stress on the articular cartilage and accelerating degenerative changes. Proprioceptive deficits from the tear can lead to compensatory movement patterns and muscle imbalances, often resulting in overactivation of stabilizing muscles like the iliopsoas while weakening gluteal function. These changes contribute to pain, dysfunction, and increased risk of osteoarthritis, ultimately impairing mobility and joint longevity.
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