Tendons and Ligaments n Tendons-muscle to bone n Ligaments-bone to bone.

Tendons and LigamentsTendons and Ligaments

Tendons-muscle to boneTendons-muscle to bone Ligaments-bone to boneLigaments-bone to bone

Collagen (E~600 MPa, fails at 4% Collagen (E~600 MPa, fails at 4% strainstrain

Tendon (load-deform. curveTendon (load-deform. curve

Biology of stress/strain curveBiology of stress/strain curve

Reconstruction of LigamentsReconstruction of Ligaments

Reconstruction--OAReconstruction--OA

100 patients-53 okay, 34 mild OA, 12 moderate OA, 1 severe OA

Hooke’s Law??? NOHooke’s Law??? NO

When can we use Hooke’s Law (When can we use Hooke’s Law (σσ=E=Eεε))– Linear elasticLinear elastic

• Strain proportional to stressStrain proportional to stress

• Instantaneous responseInstantaneous response

• Perfect storage of energyPerfect storage of energy