The Knee Flashcards
What bones articulate at the knee?
Femur
Patella
Tibia
3 joints at the knee
Patellofemoral joint
Tibiofemoral joint (Knee)
Proximal tibiofibular joint
6 connective tissues in the knee
ACL
PCL
MCL
LCL
Lateral and medial meniscus
What is the ACL?
Anterior cruciate ligament
Limits anterior displacement of the tibia relative to femur and limits excessive rotation
What is the PCL?
Posterior cruciate ligament
Limits posterior displacement of tibia in relation to femur
What is the LCL?
Lateral collateral ligament which provides lateral stability against verum stress
What is the MCL?
Medial collateral ligament which provides medial stability for knee valgum and excessive external rotation
Movements at the knee
Flexion
Extension
External rotation
Internal rotation
Muscles compartments of the knees and their roles
Anterior - extension
Posterior - flexion
Anterior muscles in the knee
Rectus femoris
Vastus lateralis
Vastus intermedius
Vastus medialis
Posterior muscles of the knee
Biceps femoris
Semimembranosus
Semitendinosus
Sartorius
Gracilis
- Popliteus
- Gastrocnemius
- Plantaris
Biarticular muscles
Articulate at two joints, meaning their origin/insertions cross two joints.
Biarticular muscles at the knee
Rectus femoris
Biceps femoris LH
Semitendinosus
Semimembranosus
Sartorius
Gracilis
Biceps femoris origins
LH: Ischial tuberosity
SH: Lower linea aspera
Biceps femoris insertion
(Laterally) Head of fibula and lateral tibial condyle
Innervation of biceps femoris
Sciatic nerve
Biceps femoris palpation
Posterolateral aspect of upper leg (w/ Knee flexion and external rotation)
Semimembranosus origin
Ischial tuberosity