Further observations on metal-backed patellar component failure. The clinical data, failure pattern, symptoms, roentgenographic findings, and failure mechanism of a series of 25 metal-backed patellar component failures are summarized. Clinical findings and history were not helpful in making the diagnosis. Roentgenographic findings led to the diagnosis in 17 of 18 and were by far the most useful data. Metal-backed patellar component failure is a new complication of total knee arthroplasty and will be seen in increasing numbers.
Caution is urged in implanting metal-backed designs until further design research is done.