DePuy Hip Replacement – History
Knee replacement surgery is the most common surgery that takes place around the world, and the next kind of surgery that falls closely after it is the hip replacement surgery.
Hip replacement is carried out when, either due to some injury to the joint or age coupled with arthritis leads to degeneration of the hip joint, causing pain, deformity and restricted, movement. The hip pain becomes so severe that it causes difficulty in getting up from chairs, stand, walk or use stairs. In order to cure hip ailments of such severity, a total hip replacement surgery is a possible treatment option that not only reduces the hip pain and improves the motion in the hip, but also promises to bring back normalcy to life.
Q. What does Hip Joint implant implies?
Ans. Hip Joint mainly consists of three parts:
- 1. Femoral Head– Ball at the top of the thighbone
- 2. Femur– The thigh bone
- 3. Acetabulum– The rounded socket in the pelvis in which the femoral head rotates within its (acetabulum’s) curved surface.
While undergoing a hip replacement, the acetabulum is replaced with the acetabular shell. The femoral stem is inserted into the femur and the femoral head is fitted inside the acetabulum. This arrangement connects the hip to the leg thereby allowing movement.
A total hip system consists of:
- 1. Stem
- 2. Head
- 3. Shell and
- 4. Liner which can either be of titanium or cobalt chrome.
And the hip replacement and choice of the hip system depends upon number of factors like:
- 1. Lifestyle
- 2. Activity levels
- 3. Weight and many more.
The weight of a total hip system can anywhere be in between 1 to 2 pounds, depending upon the material used.
There are four types of DePuy Hip Systems available:
- The AML® Total Hip System: increases the range of motion and is extensively coated with Porocoat Porous Coating. The Porocoat Porous Coating not only enhances the stability of the hip system but also encourages biological tissue ingrowth into the porous coating to hold the system securely in place.
- The S-ROM® Modular Hip System: In case the surgeons had to custom make the stem as per the individual’s anatomy then they opted for this hip system as its multiple size options provided more than 10,000 stem component combinations.
- The SummitTM Hip System: This family of femoral stems is designed to optimize the hip’s natural range of motion and restore movements, as its Porocoat Porous Coating encourages biological tissue ingrowth into the porous coating and the stem designed to be cemented into place, provides strength and stability.
- The Tri- Lock® Bone Preservation System: In surgeries where the doctors want to perform a minimally invasive surgery while keeping the maximum possible bone, the design of the Tri- Lock Bone Preservation System comes handy.
The DePuy Hip Replacement was first introduced by DePuy Orthopaedics, which is a branch of Johnson and Johnson Company. It was first launched in the market in the year 2005, in the United States, however was soon recalled by August 2010 due to its high failure rate. FDA gave special clearance to market the DePuy ASR XL Acetabular System devices, without performing the clinical trial tests to determine the safety of the products in the year 2005. However following 2008, there were approximately 400 complaints from patients who had undergone this surgery. The complaints varied from fracture of bone, metal sensitivity and pain to increased metal ions in blood, bone staining, swelling, nerve damage and many more.