At each level of the spine, there is a disc space in the front and paired facet joints in the back. Working together, these structures define a motion segment (Fig. 1A). Back pain may re­sult when injury or degenerative changes allow abnormal movement of the vertebrae to rub against one another, known as an unstable motion segment (Fig. 1B). Two vertebrae need to be fused to stop the motion at one segment. For example, an L4-L5 fusion is a one-level spinal fusion (Fig. 1C). A two-level fusion joins three vertebrae together and so on.

Think you're supposed to tilt your head to the sky when you have a nosebleed? Not so fast. Follow these steps instead:

Skin isn't just your body's biggest organ-- it's also the fastest growing.

Minimally Invasive Brain Surgery To Remove Brain Tumors.

Kidney Stone Breaking Device video, very interesting

3D animation video of Varicose Veins Sclerotherapy Treatment

Surgical Repair of Pectus Excavatum. Pectus excavatum is a condition in which a person's breastbone is sunken into his or her chest.

A cataract is a cloudiness of the normally transparent lens that is situated behind the iris. The lens focuses light rays on the retina at the back of the eye to produce a sharp image of what we see. When the lens becomes cloudy, the light rays cannot pass easily through it, and the image becomes blurry. It would be equivalent to having the lens in your camera becoming murky.

Patent ductus arteriosus (PDA), in which there is a persistent communication between the descending thoracic aorta and the pulmonary artery that results from failure of normal physiologic closure of the fetal ductus (see image below), is one of the more common congenital heart defects.

Animation of Scarless Varicose Vein Treatment No Knife Endovenous Laser

Intraarticular Fracture Base of Thumb Metacarpal Surgery

New MitraClip procedureMitral valve regurgitation, known as leaky heart valve, can be treated with the MitraClip procedure,

A hematoma is a collection of blood outside of a blood vessel. There are several types of hematomas and they are often described based on their location. Examples of hematomas include subdural, spinal, under the finger or toenail bed (subungual), ear, and liver (hepatic). Some causes of hematomas are as pelvic bone fractures, fingernail injuries (subungual), bumps, passing blood clots, blood clot in the leg (DVT), blood cancers, and excessive alcohol use. Symptoms of hematomas depend upon their location and whether adjacent structures are affected by the inflammation and swelling associated with the bleeding and may include

Removing a hump from the bridge is one of the most common things people want addressed during their rhinoplasty. Nasal humps can range widely in size. Perhaps you just have a small bump that you'd like refined? Or maybe you have more of a Roman Nose with a more dominating, distracting large hump? No matter if your nose falls on one of these extremes or somewhere in between rhinoplasty surgery can be used to reshape your nose. For anyone considering having a rhinoplasty to reduce a hump on their bridge there are several things to consider before having surgery.

It involves placing a small, expandable tube called a stent in the narrowed artery. This procedure is also called carotid angioplasty and stenting. There are two carotid arteries-one on each side of the neck-that supply blood to the brain. These arteries can be narrowed and damaged by fatty deposits called plaque.

Multiple sclerosis (MS) affects the brain and spinal cord. Early MS symptoms include weakness, tingling, numbness, and blurred vision. Other signs are muscle stiffness, thinking problems, and urinary problems. Treatment can relieve MS symptoms and delay disease progression.

The Human Body in Numbers.

No Need For An Endoscopy With This Cancer-Detecting Sponge.

In Deep Vein Thrombosis, blood clot is able to reach the heart and from there it transport to the arteries of the lungs, where it may stuck in the...

Watching A Dentist Fix Tooth Decay Is Beyond Satisfying.