Joints of Lower Extremity Flashcards
Envelope of connective tissue surrounding the bones in a joint
joint capsule
A membrane inside the capsule that secretes synovial fluid
synovial membrane
Cartilage layer on the bones at the point of contact
articular cartilage
degeneration of articular cartilage (of a joint)
osteoarthritis
A ligament separate from the joint capsule
accessory ligaments
Ligaments which thicken the capsule
intrinsic ligaments
Articular surface of the acetabulum
C-shaped Lunate Articular Surface
Inferior gap in the acetabulum
acetabular notch
Cavity of the acetabulum is deepened by a rim of fibrocartilage called…
acetabular labrum
Triradial cartilage
Y-shaped cartilage between ilium, ischium, pubis
Strongest ligament in the body
Iliofemoral ligament
Shaped like an inverted Y; attached above to ilium and below to intertrochanteric line. Prevents overextension of hip
iliofemoral ligament
Traingular ligament attached to superior ramus of pubis and lower part of intertrochanteric line; limits extension and abduction
pubofemoral ligament
Spiral shaped ligament attached to ishium and greater trochanter; limits hip extension
ischiofemoral ligament
Ligament inside the joint capsule; attached to head of femur at fovea capitis and to intrasverse acetabular ligament; transmits artery of ligament of head of femur
ligament of head of femur
Congenital dislocations of the hip are in which direction
superior. Upper lip of acetabulum may fail to form
Traumatic dislocation of the hip happens in which direction
posteriorly
With congenital dislocation of the hip, what changes about the appearance of the lower extremity
rotated medially and appears to be shorter
How does the leg rotate when the neck of the femur is fractured?
rotates laterally
Why does the leg rotate laterally when the neck of the femur is fractured?
action of the gluteus maximus and short rotators of hip
What kind of joint is the knee
condyloid synovial
Outpocketing of synovial cavity of knee joint posterior to quadriceps tendon
suprapatellar bursa
Bag of synovial fluid in subcutaneous tissue between skin and patella
prepatellar bursa
Bursa between skin and patellar ligament
superficial infrapatellar ligament
Inflammation of the prepatellar bursa (in between skin and patella)
Housemaid’s Knee
Inflammation of superficial infrapatellar bursa (between skin and patellar ligament)
Clergyman’s Knee
Ligament attached above lateral condyle of femur and below to head of fibula.
Lateral Collateral Ligament
Prevents movement of tibia medially
lateral collateral ligament
Prevents movement of tibia laterally
medial collateral ligament
Ligament attached above to medial condyle of femur below to medial side of tibia
medial collateral ligament
Prevents movement of tibia anteriorly
anterior cruciate ligament
Prevents movement of tibia posteriorly
posterior cruciate ligament
Ligament attached between condyles of tibia, anterior to intercondylar eminence; passes upward, laterally, and posteriorly to attach to medial side of lateral femoral condyle
anterior cruciate ligament
Ligament attached between condyles of tibia; attaches to lateral side of medial femoral condyle
posterior cruciate ligament
Anterior drawer sign tests for what?
You have a tear in the anterior cruciate ligament if you can draw tibia anteriorly
Posterior drawer sign tests for what?
You have a tear in the posterior cruciate ligament if you can push tibia posteriorly
Meniscus attached between condyles; also firmly attached to medial collateral ligament
medial meniscus
Meniscus more movable than the other in the knee, since it’s not attached to the fibular collateral ligament
lateral meniscus
Most dangerous hit to the knee
blow to lateral side of the knee when the leg is flexed
Terrible Triad of the Knee Joint
MCL, ACL, medial meniscus
Occurs during full extension of knee joint
femur rotates medially during last 30 degrees of movement
What passes through the gap in the interosseus membrane between tibia/fibula
anterior tibial artery
Affected in a high ankle sprain
anterior inferior tibio-fibular ligament
Ligament attached above to medial malleolus of tibia, below to medial surface of talus and calcaneus. Permits free dorsiflexion/plantar flexion but limits eversion of foot
Deltoid ligament
Common about lateral ligaments of the ankle (2)
1) all attach above to lateral malleolus of fibula
2) permit free dorsi/plantar flexion but limit inversion
Three ligaments in the lateral ankle
1-2) Anterior and Posterior Talofibular
3) Calcneofibular ligament
Ankle joints of inversion
1) subtalar joint
2) transverse tarsal joint
Joint between talus and calcaneus
subtalar joint
Joint between talus and navicular bones medially, calcaneus and cuboid bones laterally
transverse tarsal joint
Sprains of ankle are usually caused by excessive (inversion/eversion)
inversion
Ligaments commonly stretch or partially torn in an ankle sprain
anterior talofibular and calcaneofibular ligaments
Pott’s Fractures are caused by…
excessive eversion
What happens in a Pott’s Fracture
1) strong deltoid ligament does not rupture
2) medial malleolus is fractured
3) break shaft of fibula
Distal bone at a joint is angled laterally away from midline of body
Valgus
Distal bone at a joint is angled toward midline
Varus
Name for a genu valgus knee
knock-kneed
Name for a genu varus knee
bow-legged
Issue from childhood obesity in regards to the joints of the lower limb
Obesity Genu Valgum may persist into adulthood in association with childhood obesity. Can cause osteoarthritis
Causes of genu varus (bowlegged) (4)
1) Blount’s Disease
2) Growth disturbance (epiphyseal dysplasia)
3) post-trauma (injury damages growth plate)
4) rickets