The Knee Flashcards
Thigh bone. Convex
Femur
Weight bearing bone in lower leg. Medial Side. Concave
Tibia
Small bone in lower leg (lateral side)
Fibula
Knee Cap
Patella
What tendon is the knee cap located in?
Rectus Femoris
Largest sesamoid bone in the body
Patella
Provide cushion from stresses placed on the knee joint. Maintain spacing between the femur and the tibia
Menisci
What shape is the medial meniscus?
C-shaped
What shape is the lateral meniscus?
Oval shaped
What type of blood supply is supplied to the menisci?
Generally poor
Gives blood supply to the menisci?
Medial Genicular Artery
Good Blood Supply
Red-Red
Minimal Blood Supply
Red-White
Avascular
White-White
Prevents the femur from moving posteriorly during weight bearing.
ACL
What are the three bands of the ACL called
anteromedial, intermediate, and posterolateral
Limits anterior translation of the tibia in NWB
ACL
Stabilizes the tibia against excessive stress internal rotation
ACL
Works with hamstring group to stabilize the knee joint
ACL
Resists internal rotation
PCL
Prevents hyperextension of the knee
PCL
Limits anterior translation of the femur during weight bearing
PCL
Limits posterior translation of the tibia in NWB
PCL
Prevents the knee from valgus forces and external rotating forces
MCL
Lateral force
Valgus force
Medial force
Varus force
Principal stabilizer of the knee in a valgus position when combined with rotation.
MCL
Stabilizes the knee laterally
LCL
Synovial tissue separated by a thin film of fluid
Bursae
Reduces friction between anatomical structures
Bursae
Largest Fat Pad?
Infrapatellar
Function is to provide a cushion to the front of the knee and separate the patellar tendon from the joint capsule
Fat Pads
Nerve providing blood supply to the hamstrings and gastroc
Tibial Nerve
Nerve providing blood supply to the short head of the biceps femoris
Peroneal Nerve
Nerve providing blood supply to the quadriceps and sartorius muscle
Femoral nerve
Knee flexion, internal rotation, and longest muscle in the body
Sartorius
Stems from the femoral artery
Popliteal Artery
Knee extension
Quadriceps Femoris
Knee Flexion and external rotation
Biceps Femoris
What makes up the hamstrings?
Biceps Femoris, Semitendinosus, and Semimembranosus
Where are the hamstrings located?
Posterior side of upper leg
Knee flexion and internal rotation
Semitendinosus and semimembranosus
Knee flexion
Gastrocnemius
Called “bowleggedness” Caused by a medial force
Genu Varus
Called “knock-knee” Caused by a lateral force
Genu Valgum
Is genu valgum more common in women or men? Why?
Women due to the angle of the pelvis
Knees bend backwards. Excessive extension occurs in the tibiofemoral joint
Genu Recurvatum
High riding patella
Patella Alta
Low riding patella
Patella Baja
Patella high riding and lateral
Frog-eyed patella
Patella positioned medially
Squinting patella
Result of a medially directed valgus force from the lateral side or from external rotation of the tibia
MCL tear
Special tests for MCL tear?
Valgus Stress Test, anterior drawer test
Result of a laterally directed various force from the medial side or from internal rotation of the tibia
LCL tear
ST for LCL tear?
Varus Stress test
Direct lateral or valgus blow with the knee flexed and tibia externally rotated, lower leg rotated with the foot planted, or flexion decelerated injury
ACL tear
ST for ACL tear?
Anterior Drawer test, Lachman test
A full weight bearing fall on a hyper flexed knee
PCL tear
ST for PCL tear?
Posterior Drawer test
a weight bearing combined with a rotational force while extending of flexing the knee. Medial more common than lateral
Meniscal Tear
ST Meniscal Tear?
McMurray’s, Apley’s Compression test, bounce home test, and grind test
Can be acute, chronic, or recurrent as a result of kneeling, direct impact or overuse/irritation of the patellar tendon
Bursitis
ST for Bursitis?
Ballotable Patella, sweep test
Possible development of Baker’s Cyst with this injury?
Bursitis
Overuse common in runners/ cyclists, knee malalignment, running on uneven surfaces
Iliotibial Band Friction Syndrome (Runner’s Knee)
ST for IT band syndrome?
Ober’s test, Renne Test, Noble test
Direct: Falling on the patella, taking an impact on the patella.
Indirect: Running/ jumping from forceful pull on the patellar tendon
Patellar Fracture
ST for Patellar fracture?
Tuning Fork
Direct blow to the kneecap knocking the patella out of place or awkward twisting motions of the knee
Patellar Dislocation/ Subluxation
ST for patellar Dislocation?
A-angle, Apprehension test
Unknown, but related to overuse or abnormal tracking of the patella in the femoral groove
Chondromalacia Patella
ST for Chondromalacia Patella?
Patellar Grind test (Clarke’s Sign)
Caused by running, kicking, or running
Patellar Tendonitis (Jumper’s and Kicker’s Knee)
ST for Patellar Tendonitis
Strength test, ROM test
Common in immature athletes. Repeated pull of the patellar tendon at the tibial tubercle.
Osgood-Schlatter’s Disease
ST for Osgood- Schlatter’s Disease?
X-Ray
Severe blow or repeated blows to the thigh
Myositis Ossificans
ST for Myositis Ossificans?
Pain upon palpation
Increased pressure within one of four compartments of the lower leg. Causes compression of the structures in the leg
Compartment Syndrome
ST for Compartment Syndrome?
Pressure check test
Sudden stretching or sudden contraction
Quadricep Strain
ST for Quadricep Strain?
Pain with ROM test, strength test
Not entirely known. Speculated, a quick change of the knee stabilization to extension of the hip.
Hamstring Strain
ST for hamstring strain?
Strength test