MSCT Week 4: Lower Limb Flashcards
Major Functions of the Lower Limb
2 listed
- Support the body weight
- Move the body weight
Gluteal Region
between the iliac crest and the gluteal fold that defines the lower limit of the buttocks
Each of the two pelvic bones of the gluteal region is formed by?
childhood fusion of 3 bones
- Ilium
- Ischium
- Pubis
Anterior Thigh boundaries
between the inguinal ligament and the knee joint
Posterior Thigh Boundaries
Between the Gluteal Fold and the Knee
Thigh bone is?
Femur
Leg Boundaries
between the knee and ankle joints
The bones of the leg?
- Tibia
- Fibula
Bones of the foot
3 listed
- Tarsals
- metatarsals
- phalanges
How is muscular energy reduced to maintain a standing position
The ligaments of the hip and knee joints and the shapes of the articular surfaces “locks” the joints in position to reduce the muscular energy required to maintain a standing position
Identify Anatomical Parts
Identify
Identify Movements
The Hip Joint Description & Function
2 parts
- a synovial joint between the head of the femur and cup-shaped acetabulum on the lateral surface of the pelvic bone
- it is a multi-axial ball and socket joint designed for stability and weight bearing
Acetabular Labrum Description & Function
2 listed
- the fibrocartilaginous collar on the rim of the acetabulum on the lateral surface of the pelvic bone
- it deepens the acetabulum and prevents the femoral head from moving inferiorly
Acetabular labral tears
Ligament of the head of the femur Description
connective tissue that attaches the head of the femur to the acetabular fossa
The femoral head is supplied by?
A branch of the obturator artery supplies femoral head through a branch inside the head of the femur ligament
The synovial membrane around the hip joint attaches to?
The articular surfaces of the femur and acetabulum
Identify
Identify
Fibrous capsule or membrane of the hip joint Description & Function
- surrounds the synovial membrane
- holds the femoral neck in the acetabulum
How many ligaments around the fibrous capsule of the hip? what are they called?
3
- Iliofemoral ligament
- Pubofemoral ligament
- Ischiofemoral ligament
Iliofemoral Ligament location
Anterior
Pubofemoral ligament location
Anteroinferior
Ischiofemoral ligament Location
Posteroinferior
Identify
Largest synovial joint in the body
The knee
The knee joint is formed by the articulations of?
- The medial and lateral femoral condyles
- the medial and lateral tibial condyles
- the patella
The stability of the knee joint relies on?
- Quadriceps
- hamstrings
- ligaments
Ligaments of the knee joint
4 listed
- Medial or tibial collateral ligament (MCL or TCL)
- Lateral or fibular collateral ligament (LCL or FCL)
- Anterior Cruciate Ligament (ACL)
- Posterior Cruciate Ligament (PCL)
Medial collateral ligament origin and insertion
- extends from the medial epicondyle of the femur and attaches on the medial aspect of the tibia
- it is attached to the capsule and medial meniscus
Medial collateral ligament Function
prevents lateral displacement of the tibia under the femur
Identify
What prevents lateral displacement of the tibia under the femur
Medial collateral ligament
Lateral collateral ligament Origin and Insertion
extends from the lateral epicondyle of the femur and attaches to the head of the fibula
Lateral collateral ligament Function
Prevents medial displacement of the tibia under the femur
Cruciate ligaments description and properties
3 listed
- cross each other in the intercondylar region of the knee
- they are inside the capsule but outside the synovial membrane
- they connect the tibia and femur and restrict anterior to posterior movement of the knee joint
Anterior Cruciate Ligament Origin and Insertion
it extends from the lateral femoral condyle to the anterior tibia
Anterior Cruciate Ligament Function
- Keeps the tibia from moving anteriorly on the fixed femur
- it resists hyperextension and is weaker than the PCL
Posterior Cruciate Ligament Origin and Insertion
it extends from the medial femoral condyle to the posterior tibia
Posterior Cruciate Ligament Function
- keeps the tibia from moving posteriorly on the fixed femur
- Tension on it is greatest when the knee is flexed
Identify
Identify
Medial and Lateral Menisci description and function
C-shaped fibrocartilage between the articulating condyles that help make the surfaces more congruent and serve as shock absorbers
Most common menisci injury
The medial meniscus is more frequently injured than the lateral due to its attachment to the MCL
Synovial membrane of the knee joint description & function
2 listed
- attaches to the margins of the articular surfaces and menisci
- it forms pouches or bursa that provide low-friction movement for tendons such as the (Suprapatellar bursa and subpopliteal recess)
Fibrous capsule of the knee Description & Function
3 listed
- encloses the articular cavity
- it is partly formed and reinforced by muscle tendons
- the upper end of the popliteal muscle is enclosed by the fibrous membrane
Patellar Ligament Description
- The patellar Ligament is the continuation of the quadriceps tendon
- it connects the patella to the tibia
Identify
Most commonly injured structures in the knee
Called the Unhappy Triad of O’Donahue
- MCL
- Medial Meniscus
- ACL
Resultant from a blow to the lateral aspect of the knee with the foot planted on the ground
The injury is often accompanied by an audible snap and immediate pain and swelling
Unhappy Triad of O’Donahue
- Called the Unhappy Triad of O’Donahue
- MCL
- Medial Meniscus
- ACL
- Resultant from a blow to the lateral aspect of the knee with the foot planted on the ground
- The injury is often accompanied by an audible snap and immediate pain and swelling
The Ankle Joint Description
- Is a synovial hinge joint between the talus, tibia and fibula.
- the distal ends of the fibula are anchored together by medial (deltoid) and lateral ligaments to create a deep socket for the upper body of the talus
Lateral Ligament of the ankle description
Composed of 3 ligaments
is the most commonly sprained by foot inversion
- Posterior talofibular ligament
- Anterior talofibular ligament
- Calcaneofibular ligament
Most common sprain of the ankle
Anterior talofibular ligament due to foot inversion
Medial Deltoid Ligament of the ankle inferior attachment sites
is divided into four parts based on the inferior points of attachment
- posterior tibitalar
- tibiocalcanela
- tibionavicular
- anterior tibiotalar parts
Sprain of the Medial Deltoid Ligament of the ankle usually occurs how?
most often occurs by foot eversion
Identify
Identify
Lachman Test Procedure, Structure Tested and Positive Result
Anterior Drawer Test Procedure, Structure Tested and Positive Result
Posterior Drawer Test Procedure, Structure Tested and Positive Result
Valgus Stress Test Procedure, Structure Tested and Positive Result
Varus Stress Test Procedure, Structure Tested and Positive Result
McMurray Test Procedure, Structure Tested and Positive Result
Patellar Apprehension and Patellofemoral Grind Test Procedure, Structure Tested and Positive Result
Valgus
when the foot is more lateral (knock-kneed)
Varus
When the foot is more medial (bow-legged)
The muscles in the gluteal region do what?
- Abduct
- extend
- laterally rotate
the femur relative to the pelvic bone
Deep Muscles of the Gluteal Region
4 listed
are lateral rotators of the femur at the hip joint
- Piriformis
- obturator internus
- the gemelli (twins)
- quadratus femoris
Superficial Muscles of the Gluteal Region
Abduct (gluteus minimus and medius)
extend the hip (gluteus maximus)
the tensor fasciae latae muscle stabilizes the knee in extension by acting on the iliotibial tract (a band of deep fascia that passes down the lateral side of the thigh to attach to the proximal end of the tibia)
Iliotibial tract
(a band of deep fascia that passes down the lateral side of the thigh to attach to the proximal end of the tibia)
Identify
Identify
Nerves enter the gluteal region from?
- The pelvis through the greater sciatic foramen
- most are in the plane between the superficial and deep muscles
Superior Gluteal Nerve innervates and location
- gluteus medius
- gluteus minimus
- tensor fascia latae
Passes superior to the piriformis muscle
The nerve to the quadratus femoris also supplies?
Gamellus Inferior
The nerve to the obturator internus supplies and location & roots
- Gemellus superior & the obturator internus
- passes through the lesser sciatic foramen to innervate
- L5-S2 Spinal Nerves
The posterior femoral cutaneous nerve of the thigh innervates
innervates the skin of the gluteal region, the posterior thigh, and posterior leg
The inferior gluteal nerve innervates
gluteus maximus muscle
The piriformis muscle is innervated by branches of?
L5, S1 and S2 spinal nerves
The Pudendal Nerve is the nerve of the?
Perineum
Pudenal nerve roots
S2-S4
Inferior gluteal nerve roots
- L5
- S1
- S2
Obturator internus nerve roots
- L5
- S1
- S2
Quadratus Femoris nerve roots
- L4
- L5
- S1