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Horwood et al: Complications and outcomes of total hip arthroplasty in dogs with luxoid hip dysplasia: 18 cases (2010–2022)
Veterinary Surgery 4, 2024

🔍 Key Findings

  • Luxoid hip dysplasia (LH) was present in 8% of THA cases and significantly increased risk of major complications (p < .001).
  • Intraoperative fissures/fractures were 3x more likely in LH dogs vs non-LH (39% vs 16%, p = .001).
  • Dorsal luxation was more frequent in LH dogs (28% vs 4%, p = .019).
  • Acetabular cup placement with ALO >35° was associated with luxation in LH dogs.
  • Morphologic abnormalities (e.g., femoral valgus, lateralization/medialization of cortices) were common in LH and may complicate implantation.
  • Despite higher risk, 94% of LH dogs achieved satisfactory outcomes after appropriate revisions.
  • Younger age and lighter weight characterized LH dogs (mean age 14.7 months vs 40.9 months, p < .001).
  • All LH dogs were treated with cementless stems; prophylactic cerclage was rarely used.

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← Articles

Horwood et al: Complications and outcomes of total hip arthroplasty in dogs with luxoid hip dysplasia: 18 cases (2010–2022)
Veterinary Surgery 4, 2024

🔍 Key Findings

  • Luxoid hip dysplasia (LH) was present in 8% of THA cases and significantly increased risk of major complications (p < .001).
  • Intraoperative fissures/fractures were 3x more likely in LH dogs vs non-LH (39% vs 16%, p = .001).
  • Dorsal luxation was more frequent in LH dogs (28% vs 4%, p = .019).
  • Acetabular cup placement with ALO >35° was associated with luxation in LH dogs.
  • Morphologic abnormalities (e.g., femoral valgus, lateralization/medialization of cortices) were common in LH and may complicate implantation.
  • Despite higher risk, 94% of LH dogs achieved satisfactory outcomes after appropriate revisions.
  • Younger age and lighter weight characterized LH dogs (mean age 14.7 months vs 40.9 months, p < .001).
  • All LH dogs were treated with cementless stems; prophylactic cerclage was rarely used.

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Multiple Choice Questions on this study

In Horwood 2024 et al., on complications in luxoid hip dysplasia, what proportion of LH dogs had satisfactory outcomes following revision of major complications?

A. 67%
B. 78%
C. 83%
D. 89%
E. 94%

Answer: 94%

Explanation: 17 out of 18 LH dogs had satisfactory outcomes post-revision.
In Horwood 2024 et al., on complications in luxoid hip dysplasia, which cup orientation angle was associated with increased risk of postoperative luxation?

A. 25°
B. 30°
C. 35°
D. 40°
E. 55°

Answer: 40°

Explanation: LH dogs that luxated postoperatively had a median ALO of 40°, significantly higher than non-luxated LH dogs (30°, p = .016).
In Horwood 2024 et al., on complications in luxoid hip dysplasia, what was the most common surgical revision performed for dorsal luxation?

A. Increased femoral neck length
B. Conversion to cemented stem
C. Prophylactic iliofemoral suture only
D. Cup repositioning
E. Proximal femoral osteotomy

Answer: Increased femoral neck length

Explanation: Most luxated LH dogs were revised with femoral neck lengthening and/or increased head size to restore stability.
In Horwood 2024 et al., on complications in luxoid hip dysplasia, what femoral morphological abnormality was frequently seen and may complicate stem placement?

A. Lateral bowing of the shaft
B. Proximal femoral valgus
C. Torsional malalignment
D. Trochanteric retroversion
E. Femoral anteversion

Answer: Proximal femoral valgus

Explanation: Valgus, medialization of the trochanter, and lateralized cortex were common in LH dogs and can complicate stem positioning.
In Horwood 2024 et al., on complications in luxoid hip dysplasia, which intraoperative complication was significantly more common in LH dogs compared to non-LH dogs?

A. Femoral fissure or fracture
B. Sciatic neuropraxia
C. Stem subsidence
D. Acetabular fracture
E. Stem malpositioning

Answer: Femoral fissure or fracture

Explanation: Intraoperative fissure/fracture occurred in 39% of LH dogs vs 16% in non-LH dogs (p = .001).

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