Inducible displacement measured with radiostereometric analysis in primary knee arthroplasty: a systematic review of clinical studies.
Jonathan Hugo Jürgens-Lahnstein, Johanne Frost Teilmann, Emil Toft Petersen et al.
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In 30 seconds
This systematic review evaluated inducible displacement measured by radiostereometric analysis (RSA) in 23 studies of primary knee arthroplasty. The review aimed to identify a threshold for at-risk implants but found no established cut-off value. Cemented tibial components exhibited greater displacement compared to cementless designs, with maximum total point motion (MTPM) being the most common outcome measured.
Key findings
- Cemented tibial components showed greater displacement than cementless designs.
- Maximum total point motion (MTPM) was the most frequently reported outcome.
- Rotatory stress tests resulted in the largest absolute displacements.
- No threshold for identifying at-risk implants was established from the literature.
Why it matters
Understanding inducible displacement can help assess the functional stability of knee implants post-surgery. However, the lack of a defined threshold limits its clinical application in identifying at-risk implants.
What to keep in mind
The studies included were highly heterogeneous, preventing a meta-analysis or definitive conclusions.