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Study Finds Increased Risk of Femur Fracture
A 2014 study entitled “Increased Risk of Periprosthetic Femur Fractures Associated With a Unique Cementless Stem Design,” found a higher rate of femur fracture postoperatively in patients who had been implanted with a hydroxyapatite-coated Zimmer ProxiLock Hip Prosthesis stem implant.
Patients who had a stem that was hydroxyapatite coated had a femur fracture risk five times that of patients who had received other stems, according to Watts et al., the authors of the study, published in the journal Clinical Orthopaedics and Related Research. There was also a greater rate of patients who had to have hip revision surgery or reoperation after suffering a fracture, which is more complex than an initial total hip replacement surgery. 1
Zimmer Acquires Implex
The ProxiLock Hip Prosthesis stem was originally produced by the Implex Corp. In 2003, Zimmer Inc. agreed to acquire Implex and Implex became a wholly owned subsidiary of Zimmer. 2
The implant was originally manufactured by Implex Corp., and was given 510(k) approval from the U.S. Food and Drug Administration (FDA) by at least October, 2002. It was classified as a Class 2 device. 3