Radiographic Stability of Hip Prosthesis Prior to Revision Surgery

Condition(s) studied

Investigational drug(s) / intervention(s)

Implant motion provocation CT: Implant Movement Analysis. A low dose CT scan is performed with the hip fixed in external rotation. Then another low dose CT scan is performed with the hip fixed in internal rotation.The CT scans are then overimposed to each other and implant motion in relation to host bone is visualized,

Study summary

The goal of this validation study is to compare the preoperative implant stability, assessed by Implant Movement Analysis (IMA), provocation dual CT scans, with the intraoperative stability evaluation in revision hip arthoplasty. The main question it aims to answer is:

Does IMA reflect the intraoperative clinical evaluation of implant stability? Participants scheduled for revision hip arthoplasty will undergo IMA preoperativelly in addition to rutine clinical work up. During revision arthoplasty, a surgeon blinded to the IMA results will assess clinically the stability of the hip prosthesis. IMA will be compared with the intraoperative findings to assess IMAs sensitivity and specificity

Eligibility

Primary outcome measure(s)

• Cup and stem stability — within 2 months month
  The stability of the cup and the stem is evaluated: 1. Preoperatively with IMA as binary outcome (loose/not loose). 2. Intraoperatively by the surgeon as binary outcome (loose/notloose).

Trial sites (6)