The ventricular action potential has a long refractory period so that the mechanical response of the ventricle will be discrete; one coordinated mechanical response per electrâ¦ical activation sequence. Otherwise, with additional electrical stimuli, the mechanical responses would summate producing a prolonged contraction.
Microfracture Technique. Overview. Microfracture is a surgical technique that has been developed to treat chondral defects, which are damaged areas of articular cartilage of the knee. It is a common procedure used to treat patients with full thickness damage to the articular cartilage that goes all the way down to the bone.
Chondroplasty and Microfracture. Articular cartilage is the substance that covers our joints and is responsible for providing a smooth and pain-free gliding motion. If articular cartilage is damaged, or if it begins to degenerate due to a previous injury, pieces of it may break off and become loose within the joint.