Knee | CrossFit South Bay



A 3d human male anatomy with muscles and bones or skeleton and pain or ache  isolated on white background

Protect Your Joints

The knee is the largest joint in our body and is considered the most complicated one. Our knees are hinge joints that are made up of the tibia (shin) and the femur (thigh). Our knees are huge supporters of our legs, allowing us to be mobile. Repetitive trauma, strain and injuries can cause pain, which makes it difficult to walk, run or even sit.

Understanding The Knee

The meniscus is a structure that sits within the knee joint to support it and help absorb shock. The knee is meant to be a stable joint, so the muscles and ligaments work together to decrease any rotational or extreme motions. The patella sits anterior to the knee joint and is held in place by the quadriceps tendon and patellar tendon. The main function of the patella is to increase the amount of force produced by the quadriceps. It can also be a major source of knee pain if it doesn’t move along the knee joint properly, usually from muscle, IT band tightness and/or muscle weakness.

Major bones of the knee:

  • Femur
  • Tibia
  • Fibula

Ligaments of the knee:

  • Anterior cruciate ligament (ACL)
  • Posterior cruciate ligament (PCL)
  • Fibular collateral ligament (FCL)/Lateral collateral ligament (LCL)
  • Tibial collateral ligament (TCL)/Medial collateral ligament (MCL)

Major muscles and functions of the knee:

  • Flexion: hamstrings and gastrocnemius
  • Extension: quadriceps


Created by: Missy Albrecht DPT, CSCS, FMS