“…Eight studies presented information on whether the PFF occurred around primary or around revision hip stems [5, 16, 22-25, 27, 31], eight presented the information whether the stem was cemented or uncemented [5,16,22,24,25,27,30,31], three provided information about the fixation mechanism of the cemented stem (CCPT or CB) or the stem's brand name for the respective treatment group [16,22,27], three informed about the diagnosis that had led to the initial hip replacement [22,27,31] and 7 provided details about the implants used for ORIF [16,20,[22][23][24][25]30]. One study presented some of the aforementioned parameters for some of the PFF types but did not follow a consistent pattern in doing so [26].…”