Proximal Tibial-Fibular Subluxation/Dysfunction
The proximal tibial-fibular joint is located just below the knee and is made up of the tibia (shin bone) and the fibular. Movement of this joint is influenced by movement of the ankle; dorsiflexion (lifting of the toes) causes the fibular to rotate up and out while plantarflexion (pointing the toes) causes fibular to move down and inwards in relation to the tibia. Proximal tibial-fibular dysfunction occurs following a sudden forced movement of the ankle (typically dorsiflexion) where the fibular head has been forced into a fixed position.
Proximal tibial-fibular dysfunction may present as a sudden onset of lateral (outside) knee pain with the possible addition of instability and/or pain radiating down the outside of the lower leg.