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+Follow-up
In Swedish healthcare<ref>{{NU Hospital Group}}, Sep 2018</ref>, the numbers of the angles are not reported if being within normal limits. Example of an normal case:
*''Postoperative images of knee implant in unremarkable position.''
{{Reporting}}
==Follow-up==
Potential complications that need to be evaluated on follow-up are as follows.
===Radiolucent lines===
Radiolucent lines may indicate loosening of the implant. A radiolucent line thinner than than 2 mm can be tolerated at the cement-bone interface (for cemented implants) or implant-bone interface (for cementless implants) if it remains stable and appears within the first 6 months (cemented implants) or the first 2 years (cementless implants) after surgery.<ref name="Cyteval2016">{{cite journal|last1=Cyteval|first1=C.|title=Imaging of knee implants and related complications|journal=Diagnostic and Interventional Imaging|volume=97|issue=7-8|year=2016|pages=809–821|issn=22115684|doi=10.1016/j.diii.2016.02.015}}</ref>
===Displacement===
A change in position is indicated by a significant change in either of the angles listed in the post-operative evaluation section above.<ref name="Cyteval2016"/>
===Infection===
Signs of infection include:<ref name="Cyteval2016"/>
*Rapidly progressing radiolucency and/or osteolysis
*Periosteal reaction
*Bubbles of air within soft tissue or fluid collection.
===Other complications===
*Fractures of prosthesis components.
*''Wear'' of the polyethylene insert, which is the case when progressive thinning occurs over time.
*Dissociation of the polyethylene insert from the patellar component or tibial baseplate.
===Reporting===
In Swedish healthcare<ref>{{NU Hospital Group}}, Oct 2018</ref>, an example report of a normal case may be:
*''No changes since previous images on <date>.''
{{Reporting}}
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