Final Exam Flashcards
Hip joint
This joint forms the connection between the lower extremity and the pelvis
Less; more
The hip joint is (more;less) moveable than the shoulder joint but is (more;less) stable
Inflammatory and degenerative diseases
What is the hip joint susceptible to?
The articulating surfaces of the hip joint
- ) the articulating surface of the acetabulum is horseshoe shaped and is deficient inferiorly at the acetabular notch
- ) the cavity of the acetabulum is deepened by the presence of the acetabular labrum, which increases the depth of the articulation by about 10%
- ) the part of the acetabular labrum which bridges the notch is known as the transverse acetabular ligament
Ball and socket
What is the hip joint classified as?
Capsular
The strong, fairly loose ______ _______ permits free movement at the joint but cannot maintain the integrity of the joint without reinforcing ligaments.
Iliofemoral
- A very strong ligament which reinforces the capsular ligament anteriorly and inferiorly
- strongest ligament in the body
Extrinsic
Rope
Nerve supply: femoral, obturator and sciatic nerves
Pubofemoral
- reinforces the capsule anterior and inferiorly
- attaches from the superior ramus of the pubis to the intertrochanteric line
- prevents abduction
- extrinsic
- rope
Ischiofemoral
- Reinforces the capsule posteriorly
- runs from the body of the ischium to the neck of the greater trochanter of the femur
- prevents hyperextension and abduction
- extrinsic
- rope
Transverse Acetabular ligament
- intrinsic
- formed by the acetabular labrum as its bridges the acetabular notch
- the ligament converts the notch into a tunnel, through which blood vessels and nerves enter the joint
Capitis Femoris Ligament (ligament of the head of the femur)
- weak intrinsic
- function mainly to conduct a blood vessel to the head of the femur
- it is of little importance in strengthening the joint
Movement of the hip joint
- when the leg is flexed at the knee joint, flexion at the hip joint is limited by the anterior surface of the thigh coming into contact with the anterior abdominal wall
- leg is extended at the knee joint, flexion at the hip is limited by the tendons of the hamstring muscles
Development Dysplasia (congenital dislocation)
Used to describe an ongoing process with is variable in its manifestations and not always detectable at brith. Hips can be found normal at brith and can be abnormal later in life
-more common if females
If not corrected this can occur:
- pain
- abnormal gait
- unequal leg length
- osteoarthritis
- twisting of the femur (femoral anteversion = knee turned medially)
- contracture of the hip muscle
Traumatic dislocations
This is rare because the articulation is so strong and stable however dislocation may occur during trauma
Posterior dislocation
This dislocation is the most common which allows the femoral head to pass through a tear in the capsular ligament and over the acetabulum, ending up on the ilium; These types of dislocations comprise the sciatic nerve
Anterior dislocation
This dislocation allows the head of the femur to end up in the obturator foramen; these types of dislocations may comprise the obturator nerve
- femur
- tibia
- patella
*NOT the FIBULA
What bones form the articulation of the knee joint?
Three separate joints that become the knee joint
- ) between the patella and femur
- ) between the lateral condyles of the femur and tibia
- ) between the medial condyles of the femur and tibia
Lateral and medial tibial plateaus
The articulating surfaces of the tibial condyles are often referred to as _______ _______.
Ginglymus (hinge)
What is the knee joint classified as?
- femoral nerve
- obturator nerve
- common fibular nerve
- tibial nerve
What is the nerve supply of the knee joint?
Capsular ligament
Forms a loose fibrous investment of the knee joint, completely surrounding it. There are a few openings found in the anterior aspect of the ______ ______, which allows the synovial membrane to pass through and form several bursae which are significant
Subcutaneous prepatellar
This bursae lies between the patella and the skin
Subcutaneous infrapatellear bursae
This bursae lies between the tibial tubercle and the skin
Deep infrapatellar bursae
This bursae is found between the ligamentum patella and the tibial tubercle
Suprapatellar bursae
This bursae lies between the femur and the common tendon of insertion of the quadriceps (base of the patella)
Ligamentum Patella
This is an anterior ligament of the knee joint and represents the original distal common tendon of insertion of the quadriceps
Runs from the apex of the patella to the tibial tubercle
Important role in maintaining the alignment of the patella
Extrinsic
Collateral ligaments
These ligaments (lateral and medial collateral) are taut when the knee joint is fully extended and thus contribute to stability when standing
Lateral (fibular) collateral ligament
Located on the lateral side of the knee joint
Attaches from the lateral epicondyle of the femur (proximally) to the head of the fibula (distally)
Function:
- wall
- extrinsic
- prevent lateral movement
Medial (tibial) collateral ligament
Located on the medial side of the knee joint
Attaches to the medial epicondyle of the femur (proximally) and to the medial side of the tibia just below the medial condyle (distally)
Function:
- wall
- extrinsic
- prevents medial movement
Oblique and accurate popliteal ligaments
Found on the posterior aspect of the knee joint
Function:
- wall
- extrinsic
- prevent hyperextension
- stabilize the posterior aspect of the joint
Cruciate ligaments (ACL, PCL)
2 Very strong ligaments which cross each other like and “X” in the center of the joint
They are named according to their tibial attachments
They are the main bonds between the femur and tibia*****
-intrinsic
Anterior cruciate ligament (ACL)
The weaker of the 2 and runs from the lateral condyle of the femur (proximally) to the anterior intercondylar area of the tibia (distally)
Function:
- prevents antihero displacement of the tibia under the femur
- rope
- intrinsic
Posterior Cruciate ligaments (PCL)
Stronger of the 2 and runs from the medial condyle of the femur (proximally) to the posterior intercondylar area of the tibia (distally)
Function:
- prevents posterior displacement of the tibia under the femur
- rope
- intrinsic
Menisci or semilunar cartilages
the ______ have a well developed blood supply from the time of birth until about 18 months of age. ONCE infant begins to walk they loose 75% of their vascular supply.
Nutrition of the _____ is from the synovial fluid for the central portion of the _____.
Functions:
- deepen the articulating surface
- shock absorber
- mechanoreceptor to increase positional sense of the knee joint
Medial meniscus
Is “C” shaped and firmly adheres to the tibial collateral ligament
It’s less mobile on the surface of the tibia
Lateral Meniscus
Nearly circular in shape and smaller than the medial meniscus
More freely moveable on the surface of the tibia
Coronary ligaments
Associated with the menisci
Are a portion of the joint capsular ligament which attaches to the edge of the menisci and helps to hold them in place
Transverse ligament
Joins the anterior edges fo the medial and lateral menisci and allows them to work together
Flexion and extension
What are the main movements of the knee joint?
Popliteus muscle
To unlock the knee the ______ ______ must contract to rotate the tibia medially and thus cause flexion at the knee joint
Prepatellar (housemaid’s) bursitis
Caused by friction between the skin and the patella
May also occur from a direct blow or falling on a flexed knee
If chronic, the bursae will become distended with fluid and form a swelling anterior to the knee
Subcutaneous infrapatellar bursitis
Caused by excessive friction between the skin and tibial tubercle
Also known as “clergyman’s knee”
Suprapatellar Bursitis
Caused by bacteria from an abrasion or penetrating wound
Infection may spread to the knee joint cavity
Ligament sprains
Very common especially when the foot is fixed on the ground
Unhappy triad
Refers to a blow to the lateral aspect of the joint while it is in weight bearing that can cause damage to the medial collateral (MCL), anterior cruciate (ACL), and medial meniscus
Damage to the medial collateral ligament (MCL)
Most commonly injured ligament of the knee joint
Occurs from a lateral blow and rotational forces during trauma
Damage to medial meniscus
More vulnerable to injury than the lateral meniscus
Patients will complain of their knee “clicking”, locking up, pain when going up stairs
Larger tears need surgery
Can lead to damage of the articular cartilage and osteoarthritis
Damage to anterior cruciate ligament (ACL)
Can be damaged in sports that require twisting and jumping
Patients will hear a “pop” and a sensation that their knee has “given out”
This type of injury will produce a condition in which the tibia can be pulled excessively forward under the femur (Positive anterior drawer test)
Damage to the posterior cruciate ligament (PCL)
Is injured much less commonly than the ACL
This type of injury, the tibia can be pulled or moved excessively backward under the femur (positive posterior drawer test)
Tibia
- weight bearing bone
- articulates with the condyles of the femur and head of the fibula (proximally
- articulates with the talus and distal end of the fibula (distally)
Fibula not part of the articulation with the knee joint