DePuy Orthopaedics has released two types of metal-on-metal hip implants, ASR XL Acetabular System and ASR Hip Resurfacing System, in 2003 Worldwide, there are more or less 93,000 individuals who
have received these implants. In August 2010, however, the company voluntarily recalled the device The company cited early failure of the devices, resulting in about one in eight patients
requiring revision surgery
The acetabular cup component of the device was the first problem According to reports, its cup was shallower compared to other available implants Because of its shallow design, the device is particularly susceptible to flaking debris. Also, when compared to the socket, the femoral head appears to be larger. With incongruent ball and socket sizes, a bigger part of the femoral head is exposed Reportedly, metallosis may happen due to corrosion and flaking of metal particles at the femoral head part.
The potential complications should be known to patients who had the device. Pain in the groin, hip or leg; change in walking ability; and swelling at or near the hip joint are some of the symptoms linked with the device. Additionally, patients may feel pain when walking, rising from a seated position or when bearing weight on the affected hip.
Implant loosening and dislocation is sometimes experienced by patients When the implant is detached from the bone, loosening happens Displacement of the femoral head out of the hip joint occurs in hip dislocation. Weakening of the muscles surrounding the hip joint and stretching of the capsule may have caused the dislocation.
DePuy’s hip replacement cup design is the cause for the early failure, as believed by orthopedic specialists The design, according to Dr. Harlan C. Amstutz, a Los Angeles orthopedic surgeon, was prone to problems. Dr. Thomas P. Schmalzreid, designer of the ASR hip system, stated that DePuy has known for years that their device, when compared to other hip implants, is more difficult to embed.
Regular check-up is highly recommended to individuals who were given the hip implants.Yearly monitoring is also given importance to ensure that the device is functioning well even if the patient does not manifest any hip replacement symptoms. Additionally, doctors are advised to immediately report these symptoms and other complaints that may signal a failing device