Knee ReplacementAlan Golde Jr

BME181

• The knee is the largest joint in the body

• Knee replacements first performed in the 1960’s

• More then 4.5 million Americans currently living with at least one total knee replacement

• 650,000 knee replacements in 2010

Causes• Advanced osteoarthritis • Knee joint or bone trauma• Genetics, developmental abnormalities• Repetitive injuries• Obesity

Procedure

• Incision is made to expose the knee joint

• Damaged parts of the tibia and femur are removed

• The implants are then fused to the bone

• Spacer is inserted to allow easy, low friction gliding

Materials• The femur and tibia metal implants are usually made out

of titanium or metal like cobalt chrome• The spacer consists of a polyethylene plastic. Tailored to

the patient • Polymethylmethacrylate bone cement is commonly used

or pegs are drilled into the bone to attach the metal components to the bones

• TKR cost anywhere from $20,000 to $60,000 dollars• Takes only 1 to 2 hours• Extremely high success rates (95%)• Recovery time of 8 to 12 weeks with physical therapy

Limitations• Decrease in normal range of motion from 0-135 degrees

to 0-110 degrees• Any activity involving excessive knee impact • Kneeling

References• http://www.keggiorthosurgery.com/knee_replacement.php• http://www.healthline.com/health/total-knee-replacement-s

urgery/statistics-infographic

• http://orthoinfo.aaos.org/topic.cfm?topic=a00389• http://bonesmart.org/knee/conditions-leading-to-knee-repl

acement-surgery/

• http://www.andersonclinic.com/specialties/total-knee-replacement-arlington-alexandria-virginia.php