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Lomas et al: The Impact of Double Pelvic Osteotomy on Dorsolateral Subluxation in 24 Dogs
Veterinary and Comparative Orthopaedics and Traumatology 2, 2025

🔍 Key Findings

  • DPO significantly improved femoral head coverage, increasing mean DLS from 36.1% to 71.4% postoperatively (p < 0.001).
  • No significant change in DLS between immediate postoperative and follow-up scans, suggesting stable surgical outcomes over time.
  • Greater plate angle (30°) yielded larger DLS improvement (mean increase: 39.8%) compared to 25° and 20° plates.
  • Only 3 hips had post-op DLS scores <55%, indicating most patients had lower risk of osteoarthritis progression.
  • No correlation found between DLS improvement and age, body weight, or side of surgery, suggesting broad applicability.
  • CT was used for DLS measurement in simulated weight-bearing, improving precision over radiographic methods.
  • Major limitations included small sample size, multiple surgeons, and variable sedation vs anesthesia during imaging.
  • DPO confirmed as effective for reducing dorsolateral subluxation, improving coxofemoral joint congruency in dysplastic dogs.

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← Articles

Lomas et al: The Impact of Double Pelvic Osteotomy on Dorsolateral Subluxation in 24 Dogs
Veterinary and Comparative Orthopaedics and Traumatology 2, 2025

🔍 Key Findings

  • DPO significantly improved femoral head coverage, increasing mean DLS from 36.1% to 71.4% postoperatively (p < 0.001).
  • No significant change in DLS between immediate postoperative and follow-up scans, suggesting stable surgical outcomes over time.
  • Greater plate angle (30°) yielded larger DLS improvement (mean increase: 39.8%) compared to 25° and 20° plates.
  • Only 3 hips had post-op DLS scores <55%, indicating most patients had lower risk of osteoarthritis progression.
  • No correlation found between DLS improvement and age, body weight, or side of surgery, suggesting broad applicability.
  • CT was used for DLS measurement in simulated weight-bearing, improving precision over radiographic methods.
  • Major limitations included small sample size, multiple surgeons, and variable sedation vs anesthesia during imaging.
  • DPO confirmed as effective for reducing dorsolateral subluxation, improving coxofemoral joint congruency in dysplastic dogs.

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Multiple Choice Questions on this study

In Lomas 2025 et al., on DPO and dorsolateral subluxation, which of the following factors had **no significant impact** on change in DLS score after DPO?

A. Plate angle
B. Age at surgery
C. Body weight
D. Side of surgery
E. All of the above

Answer: All of the above

Explanation: None of these factors significantly affected change in DLS score, suggesting DPO benefits across patient characteristics.
In Lomas 2025 et al., on DPO and dorsolateral subluxation, what was the main conclusion regarding postoperative change in DLS over time?

A. DLS significantly decreased
B. There was a mild increase
C. DLS remained stable
D. Post-op scores were unreliable
E. DLS increased then declined

Answer: DLS remained stable

Explanation: No significant change in DLS was observed between immediate post-op and follow-up scans (median 51 days), suggesting stable outcome.
In Lomas 2025 et al., on DPO and dorsolateral subluxation, what plate angle resulted in the greatest increase in DLS score postoperatively?

A. 15°
B. 20°
C. 25°
D. 30°
E. 35°

Answer: 30°

Explanation: The 30° plate yielded the highest mean DLS increase (39.8%) compared to other plate angles.
In Lomas 2025 et al., on DPO and dorsolateral subluxation, what percentage of hips had a post-DPO DLS score <55%, indicating higher OA risk?

A. 0%
B. 3%
C. 11%
D. 25%
E. 40%

Answer: 11%

Explanation: Only 5 of 45 hips had a post-op DLS <55%, suggesting the majority were low risk for OA development.
In Lomas 2025 et al., on DPO and dorsolateral subluxation, what was the mean DLS score immediately postoperatively?

A. 55.2%
B. 61.5%
C. 71.4%
D. 80.3%
E. 88.6%

Answer: 71.4%

Explanation: The mean DLS score increased from 36.1% pre-op to 71.4% immediately post-op, indicating improved femoral head coverage.

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