CT-based navigation comparable to imageless navigation in acetabular component insertion .
OrthoEvidence Journal (OE Journal) - ACE Report
OE Journal. 2013;1(12):43 J Bone Joint Surg Br. 2006 Feb;88(2):163-790 patients with primary osteoarthritis undergoing total hip arthroplasty (THA) were randomised to receive one of three techniques used for implanting the acetabular component. The three methods were by freehand, CT-based, or imageless navigation. The primary outcome was the position of the component based on CT scans of the pelvis postoperatively. Results indicated that the CT-based navigation had comparable outcomes to the imageless navigation method, but was superior to the conventional freehand positioning technique.
Was the allocation sequence adequately generated?
Was allocation adequately concealed?
Blinding Treatment Providers: Was knowledge of the allocated interventions adequately prevented?
Blinding Outcome Assessors: Was knowledge of the allocated interventions adequately prevented?
Blinding Patients: Was knowledge of the allocated interventions adequately prevented?
Was loss to follow-up (missing outcome data) infrequent?
Are reports of the study free of suggestion of selective outcome reporting?
Were outcomes objective, patient-important and assessed in a manner to limit bias (ie. duplicate assessors, Independent assessors)?
Was the sample size sufficiently large to assure a balance of prognosis and sufficiently large number of outcome events?
Was investigator expertise/experience with both treatment and control techniques likely the same (ie.were criteria for surgeon participation/expertise provided)?
Ja = 1
Ungewiss = 0.5
Nicht relevant = 0
Nein = 0
Die Bewertung der Berichtskriterien bewertet die Transparenz, mit der die Autoren die methodischen und studienspezifischen Merkmale der Studie in der Veröffentlichung angeben. Die Bewertung ist in fünf Kategorien unterteilt, die im Folgenden vorgestellt werden.
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Randomization
3/4
Outcome Measurements
1/4
Inclusion / Exclusion
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Therapy Description
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Statistics
Detsky AS, Naylor CD, O'Rourke K, McGeer AJ, L'Abbé KA. J Clin Epidemiol. 1992;45:255-65
Der Fragilitätsindex ist ein Instrument, das bei der Interpretation signifikanter Ergebnisse hilft und ein Maß für die Stärke eines Ergebnisses liefert. Der Fragilitätsindex gibt die Anzahl der aufeinanderfolgenden Ereignisse an, die zu einem dichotomen Ergebnis hinzugefügt werden müssen, damit das Ergebnis nicht mehr signifikant ist. Eine kleine Zahl steht für ein schwächeres Ergebnis und eine große Zahl für ein stärkeres Ergebnis.
Warum wurde diese Studie jetzt benötigt?
Range of motion can be restricted when the acetabular component is not positioned correctly during total hip arthroplasty procedures. This malposition can lead to dislocation and increased wear, making proper positioning of the component crucial to short and long-term outcomes. CT-based, freehand, and imageless navigation are three viable methods used for component positioning. This study examines these three methods of implanting acetabular components in total hip arthroplasty (THA).
Was war die wichtigste Forschungsfrage?
What are the outcomes of component positioning when acetabular components are implanted via freehand, CT-based. or imageless navigation in patients undergoing total hip arthroplasty?
- 14/30 patients from the freehand group had the placement of the acetabular component within the safe zone. 25/30 patients from the computer-assisted CT group and 28/30 patients from the imageless group had the components falling within the safe zone limits. (Overall p=0.001)
- No significant difference was seen between the imageless navigation group and the CT-based group on component insertion. (p=0.23)
- A significant reduction in variation of the acetabular component position was seen with the imageless navigation group and the CT-based group compared to the freehand group. (p<0.001)
- The imageless group had an increased operation duration of 8 minutes (p=0.11) while the CT-based navigation group had an increased operation duration of 17 minutes compared to the freehand group. (p<0.002)
- The freehand group had a mean blood loss of 399 (50 to 1090) ml/48 hours compared to 341 (50 to 950) ml/48 hours for the CT-based group, and 359 (20 to 730) ml/48 hours for the imageless group.
Was sollte ich mir besonders merken?
The imageless navigation method is comparable in effectiveness to the CT-based technique in positioning the acetabular component for total hip arthroplasty. Both the imageless and CT navigation methods are superior to the conventional freehand placement method.
Wie wird sich dies auf die Behandlung meiner Patienten auswirken?
Further studies are suggested to determine whether the improved placement of the acetabular component from the imageless or CT-based implant technique reduces postoperative complications and increases survival of the implant in patients.
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