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A pressure sore, or decubitus ulcer is caused mainly by the restriction of blood flow and/or lymphatic drainage as a result of excessive tissue deformation caused by by constant pressure or friction (shear forces).
Other names for this condition include bed sores, pressure ulcers and decubitus ulcers ('lying down' ulcers).
The skin over bony areas, such as the heels, elbows, the back of the head and the tailbone (coccyx), are particularly at risk.
Pressure Ulcers can be difficult to treat.
Heavy pressure blocks or occludes blood vessels. The greater the pressure the less time it takes to block. The smaller the area, the greater the pressure, hence bony areas are more prone to pressure sores.
Skin being pulled sideways over muscle or bone when moving can stretch and block the blood vessels, restricting blood flow to skin. Excessive shearing can affect deeper tissues. Necrosis (tissue death) can occur from inside and move out. Abrasion or friction causes the surface of the skin to be rubbed away faster than it can be replaced.
Excessive heat and moisture can contribute to the development of pressure sores. These factors can increase the vulnerability of tissues to damage from pressure and shear forces.
Pressure ulcers are usually found on the bony prominences. The majority are fund on the large bony areas in the pelvic region of the body.
These include the ischial tuberosity, sacrum, coccyx, trochanter, and iliac crest.They may also form on the heels, ankles and knees.
Sacrum, Ischial Tuberosity, Heels.
Scapula, Elbow, Sacrum & Coccyx, Ischial Tuberosity, Heels, Plantar Surface of foot.
The malleolus, condyles, trochanter, ribs and ear are at risk from pressure when side lying.
Decubitus ulcers occur at sites overlying bony structures that are prominent when the person is lying down. The location of the pressure ulcer will depend on the person's position and the length of time he/she remains in that position. The bony prominences that support weight in the supine position are the occiput (back of the head), scapula, sacrum and heels.
Decubitus ulcers may occur on the scalp, back, tailbone, hip, heel, or any other area to which pressure is applied while a person is lying down.
Sacrum: The sacrum is a large, triangular bone at the base of the spine and at the upper and back part of the pelvic cavity, where it is inserted like a wedge between the two hip bones. Its upper part connects with the last lumbar vertebra, and bottom part with the coccyx (tailbone).
Ischial tuberosities: The sitting bones in the bottom or butt.
Coccyx: Contains 4 small fused bones known as the tail bone.
Trochanter: The greater trochanter is the name given to bony protusion at the top of the femur.
Iliac crest: Hip bone.
Scapula: Shoulder blade.
Malleolus: The lateral malleolus is the bony bit on the outside of the ankle and the medial malleolus is the bony bit on the inside of the ankle.
Condyles: femoral condyle is the end of the thigh bone.