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Vet Comp Orthop Traumatol
DOI: 10.1055/a-2648-3251
Original Research

Effect of Double Pelvic Osteotomy on Dorsal Acetabular Rim Angle Using Computed Tomography in 27 Dogs

Ingrid Trommelmans 
1   Small Animal Specialist Hospital, Surgery Department, Tuggerah, New South Wales, Australia
,
Paul L Jenkins
1   Small Animal Specialist Hospital, Surgery Department, Tuggerah, New South Wales, Australia
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Abstract

Objective

This study aimed to quantify the effect of double pelvic osteotomy (DPO) on dorsal acetabular rim angle (DARA) in a clinical cohort of dogs.

Study Design

Retrospective study.

Methods

The DARA was measured on computed tomographic (CT) studies of 27 client-owned dogs that underwent DPO due to hip dysplasia. The change in DARA was determined for 30-, 25- and 20-degree preangled-locking DPO plates. The preoperative DARA was compared to the immediate postoperative DARA, and where available, the postoperative DARA was compared to short- and long-term DARA measurements.

Results

27 dogs underwent DPO, resulting in 49 hips available for analysis. The median preoperative DARA was 16.3 degrees (Q1–Q3, 12.3–22.2) and 17.6 degrees (Q1–Q3, 12.42–1.0) for right and left hip, respectively. The median postoperative DARA was −4.5 degrees (Q1–Q3, [−8.8]–[−1.3]) for the right hip and −4.1 degrees (Q1–Q3, [−7.6] to 5.8) for the left hip. The median change in DARA was 23.4 degrees (Q1–Q3, 17.5–26.15), 16.7 degrees (Q1–Q3, 12.2–20) and 15 degrees (Q1–Q3, 14.1–15.2) for a 30-, 25- and 20-degree plate, respectively. Short-term follow-up CT was available for 16 dogs (30 hips) at a median of 48 days (Q1–Q3, 45–57 days) and long-term follow-up CT was available for 12 dogs (22 hips) at a median of 386 days (Q1–Q3, 325–557). The postoperative DARA and short- and long-term DARA measurements did not change significantly (p > 0.05).

Conclusion

The acetabular ventroversion achieved with DPO is less than the predetermined plate angle. The median differences for the 30-, 25-, and 20-degree plates are 6.6, 8.3, and 5 degrees, respectively.

Clinical Significance

The results can aid in implant selection for DPO.

Keywords

pelvic osteotomy - acetabular ventroversion - osteotomy - hip dysplasia - DARA

Authors' Contribution

Both the authors contributed to the conception, study design, acquisition of data, data analysis and interpretation. Both the authors drafted, revised, and approved the submitted manuscript and are publicly responsible for the relevant content.




Publication History

Received: 23 February 2025

Accepted: 02 July 2025

Article published online:
16 July 2025

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