A (Co Cr Mo) hip implant was inserted into a patients femur The acetab...

A (Co-Cr-Mo) hip implant was inserted into a patientâ€™s femur. The acetabular cup was made of...

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A (Co-Cr-Mo) hip implant was inserted into a patientâ€™s femur.The acetabular cup was made of surgical stainless steel. After oneyear of operation, the patient was complaining about severe pain.He was put on painkillers because the situation was getting worsewith time. X-ray radiography revealed wear debris as well as alarge gap at the interface between the implant and bone. Theorthopaedic surgeon decided to re-operate to retrieve the oldimplant and replacing it with a new one. He found massive corrosionin the retrieved implant.
i) What would be the causes of that corrosion, wear and theoccurrence of the interfacial gap between the implant and bone?
ii) Describe the factors that should be taken into considerationin the design to minimize these failures.

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3.7 Ratings (320 Votes)

i acetabular debonding a rare and poorly understood failure mode In debonding bone ingrows into the implant initially but late loosening occurs when the plasma porous coat on the outer face of the acetabular cup becomes detached from the bulk implant and remains fixed to the pelvic bone Acetabular component position seems to have some influence identified postoperative time AIA and implant type as risk factors for debonding debonding of the porous coat occurs due to accumulation of microfractures at the coatingsubstrate interface Failures may relate to release of minute metallic particles or metal ions from wear of the implants causing pain and disability severe enough to require revision surgery in 13 of patients Design deficits of some prothesis models especially with heattreated alloys and a lack of special surgical experience accounting for most of the failures The cause of these failures remain controversial and may include both design factors technique factors and factors related to patient See Answer

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