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Objectives:
To assess the accuracy of computer-assisted drilling (CAD) of equine cervical vertebrae using a purpose-built cervical frame (CF) and two different patient tracker arrangements.
Methods:
Six fresh equine cadavers were used to assess the accuracy of CAD using the CF. Cadavers were positioned in dorsal recumbency with the neck stabilized in extension within the CF. A cone-beam CT based surgical navigation system with optical tracking was used. A ventral approach was made to expose cervical vertebrae C3 to C5 in each specimen. Eight drill tracks were planned and prepared per vertebral body. An equal number of drill tracks were executed with the patient tracker mounted on a panel of the CF (study group) or on the ventral crest of C3 (control group), respectively. Surgical accuracy aberration (SAA) was assessed for each drill tract by determining the Euclidean distances between the planned and executed entry and target points on merged pre- and postoperative datasets. Descriptive statistics and repeated-measures analysis of variance (rep.-meas. ANOVA) were performed to compare SAA measurements between groups.
Results:
The stability of the CF and the accuracy of the system remained consistent in all cadavers. Overall median ±95%CI SAA was 1.9 mm ± (1.8 – 2.1) in the study group and 2.1 mm ± (1.9 – 2.4) in the control group (rep.-meas. ANOVA p = 0.215).
Conclusions:
The developed CF can facilitate CAD of cervical vertebral bodies without compromising surgical accuracy by placing the patient tracker on the CF to avoid intra-operative tracker interference.
34th Annual Scientific Meeting proceedings
Stream:
|
Session:
Date/Time: 03-07-2025 (19:15 - 19:30) | Location:
Date/Time: 03-07-2025 (19:15 - 19:30) | Location:
Accuracy of computer-assisted drilling of equine cervical vertebral bodies using a purpose-built frame - an experimental cadaveric study
Maurer T1, De Preux Dr Med Vet, DECVS M*1, Vidondo MScBiol, MSc, IT, PhD B2, Precht Dr Med Vet, DECVDI, PhD C3, Koch C*1
1Swiss Institute of Equine Medicine (ISME), Department of Clinical Veterinary Medicine, Vetsuisse-Faculty, University of Bern, Bern, Switzerland, 2Veterinary Institute for Public Health, Vetsuisse-Faculty, University of Bern, Bern, Switzerland, 3Division of Clinical Radiology, Department of Clinical Veterinary Medicine, Vetsuisse-Faculty, University of Bern, Bern, Switzerland.
Objectives:
To assess the accuracy of computer-assisted drilling (CAD) of equine cervical vertebrae using a purpose-built cervical frame (CF) and two different patient tracker arrangements.
Methods:
Six fresh equine cadavers were used to assess the accuracy of CAD using the CF. Cadavers were positioned in dorsal recumbency with the neck stabilized in extension within the CF. A cone-beam CT based surgical navigation system with optical tracking was used. A ventral approach was made to expose cervical vertebrae C3 to C5 in each specimen. Eight drill tracks were planned and prepared per vertebral body. An equal number of drill tracks were executed with the patient tracker mounted on a panel of the CF (study group) or on the ventral crest of C3 (control group), respectively. Surgical accuracy aberration (SAA) was assessed for each drill tract by determining the Euclidean distances between the planned and executed entry and target points on merged pre- and postoperative datasets. Descriptive statistics and repeated-measures analysis of variance (rep.-meas. ANOVA) were performed to compare SAA measurements between groups.
Results:
The stability of the CF and the accuracy of the system remained consistent in all cadavers. Overall median ±95%CI SAA was 1.9 mm ± (1.8 – 2.1) in the study group and 2.1 mm ± (1.9 – 2.4) in the control group (rep.-meas. ANOVA p = 0.215).
Conclusions:
The developed CF can facilitate CAD of cervical vertebral bodies without compromising surgical accuracy by placing the patient tracker on the CF to avoid intra-operative tracker interference.
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