Welcome to Active Joints Orthopedics


David N. Feldman, M.D.
Dr. David Feldman is a Board Certified orthopaedic surgeon specializing in joint surgeries. As a founding member of the Society for the Advancement of Blood Management, Dr. Feldman uses minimally invasive techniques for patients requiring reconstruction of the hip. In an effort to prolong the life of hip replacements, he pioneered metal on metal hip replacements at Englewood Hospital and Medical Center. Dr. Feldman has been involved in designing and trialing innovative hip prostheses at Englewood Hospital and Medical Center and Holy Name Hospital.

Englewood Hospital and Medical Center and Holy Name Hospital are pleased to be part of an FDA approved study of a novel, minimally invasive hip replacement. Standard total hip replacement has been helpful to many patients but has its limitations.

The study is an FDA approved, pre-market trial of the metal on metal hip resurfacing system. Since this is a minimally invasive procedure, the advantage of using this device and procedure over a total hip replacement includes less blood loss during the surgery. Hips are a ball and socket type of joint with smooth gliding surfaces that allow pain-free motion.

This new prosthesis does not require cutting off and discarding the entire femoral head and neck of the femur (top of the thigh bone), which is done in a total hip replacement. Instead, this device resurfaces the head of the femur with the placement of a metal cap over the existing femoral head. A metal shell that is customized to the bone lines the cup, or acetabular part of the hip. The device moves with the ball gliding against the cup.

The standard practice for patients requiring a hip replacement has been total hip replacement. Typically this required 1) inserting a metal on plastic prosthesis in the body by cutting off the top of the thigh bone, 2) inserting a stem in the femur with a ball on the top to take the place of the hip’s ball, and 3) placing a plastic liner into the acetabulum against the ball to take the place of the hip cup.

Not only does this system remove the need to core out the thighbone, thereby preventing much blood loss and postoperative pain, but also there is no longer any need to remove the head and neck of the thighbone. After surgery, the patient may have a greater range of motion and be able to return to normal activities with less fear of hurting their hip and less incidence of hip dislocation. Other advantages include preserving the thighbone head and canal, and elimination of the risk of thighbone fracture from stem implantation. Should a revision of the hip be required, the subsequent surgery is much simplified.

Since total hip replacements typically wear out after 10-15 years, this metal-on-metal resurfacing hip arthroplasty may be ideal for the younger, more active patient with hip arthritis, who has failed conservative treatments, and requires hip replacement.

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