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Knee Surgery

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Darren J. Friedman MD is a knee surgeon in New York City. Dr. Friedman is a board-certified Orthopedic Surgeon and Clinical Assistant Professor of Orthopedic Surgery at Weill Cornell Medical College. Dr. Friedman specializes in minimally invasive surgery of the knee resulting in less downtime and faster return to activities.
Dr. Friedman specializes in the Minimally Invasive Surgical Treatment of:
  • ACL injuries (All Arthroscopic ACL reconstruction)
  • PCL injuries
  • Multi-ligamentous Knee Injury
  • Meniscus Tears
  • MCL/LCL Tears
  • Knee Instability
  • Patella (kneecap) Instability
  • Chondral (cartilage) Defects
  • Cartilage Restoration
  • Osgood-Schlatter Disease
  • Patella Fracture
  • Tibial Plateau Fractures

Bones about the knee:

The knee joint is made up of four bones:
  • The femur is the bone of the thigh. It is the largest bone in the body.
  • The tibia is the large bone in the lower leg. The femur sits on the tibia.
  • The fibula is the smaller bone in the lower leg. It serves as an attachment point for muscles and the lateral collateral ligament.
  • The patella is also known as the “kneecap”. It is located in front of the femur and tibia. As the knee moves, the patella slides within a groove on the femur.

Cartilage about the knee:

There are two types of cartilage within the knee:
Articular Cartilage – The ends of each bone are covered with this smooth substance. The articular cartilage serves two purposes:
  • minimizes friction and wear of the bone surfaces.
  • spreads the loads that are applied to a joint.
Meniscus – There are two C-shaped wedges called menisci (plural). The medial meniscus and the lateral meniscus are cushions between the femur and the tibia. These rubber-like shock absorbers improve the fit of the two bones. The menisci are the parts of the knee damaged when someone is said to have “torn cartilage."
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Dr. Friedman proudly serves the tri-state area while providing comprehensive patient care. You can contact Darren J. Friedman, MD at his Manhattan office to determine if knee surgery is right for you, and he'll make sure you're knowledgeable of your condition and treatment options.

Ligaments about the knee:

Four major ligaments connect the bones of the upper and lower leg. Ligaments are strong bundles of fibers that stabilize the joint, guide joint motion, and prevent excessive motion.
Anterior Cruciate Ligament (ACL) and Posterior Cruciate Ligament (PCL)The cruciates are the two major ligaments inside the knee joint. The name “cruciate” means “cross” and comes from the fact that these two ligaments cross each other as they attach to the femur and the tibia.Medial Collateral Ligament (MCL) and Lateral Collateral Ligament (LCL)The collateral ligaments are the ligaments on either side of the knee joint. The MCL is on the inner side of the knee and the LCL is on the outer side of the knee.

Muscles & Tendons about the knee:

Two sets of muscles cross the knee joint to make it move.
  • The quadriceps (sometimes referred to as “quads”) are four muscles in the front of the thigh that straighten the knee .
  • The hamstrings (sometimes referred to as “hams”) are the muscles in the back of the thigh that work together to bend the knee.
Tendons are the connective structures that attach muscle to bones. Ligaments connect bone to bone. The four quadriceps come together to form one tendon called the quadriceps tendon. This tendon surrounds the patella and is called the patellar tendon as it attaches the muscles to the tibia.
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Why Choose Dr. Friedman?

  • Board Certified Orthopedic Sports Medicine Specialist
  • Board Certified Orthopedic Surgeon
  • Director - New York Downtown Center for Sports Medicine @ New York Presbyterian Lower Manhattan Hospital
  • Clinical Assistant Professor Dept. of Orthopedic Surgery – Weill Cornell Medical College
  • Fellow – American Academy of Orthopedic Surgeons
  • Fellow – Arthroscopy Association of North America
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