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Equine veterinary journal2024; doi: 10.1111/evj.14053

Osteoarthritis of the coxofemoral joint in 24 horses: Evaluation of radiography, ultrasonography, intra-articular anaesthesia, treatment and outcome.

Abstract: Few case reports describe equine coxofemoral joint osteoarthritis (CFJOA). Objective: To evaluate diagnostic findings and outcome of horses with CFJOA and to provide a score facilitating radiographic assessment. Methods: Retrospective case series. Methods: History, clinical signs, ultrasonographic, radiographic and intra-articular anaesthesia findings, treatments, outcome, and necropsy results of horses with CFJOA presented between 2002 and 2023 were collated. Radiographic findings were categorised to develop a radiographic score which was applied by two masked examiners. Intra- and inter-observer reliability was determined using weighted Cohen's kappa (Cκ) and the correlation between radiographic and ultrasound findings via Spearman correlation coefficient. Results: The study included 24 horses (median age 14 years). Most of them (20/24) were chronically lame. Frequent clinical signs included unilateral gluteal muscle atrophy (18/21), lengthening of the stride of the affected limb (13/19) and locomotion on three tracks (13/20). Both imaging modalities enabled evaluation of periarticular osteophytes (correlation coefficient r = 0.64; p = 0.003). Additionally, radiography allowed detection of irregular joint spaces, subchondral bone opacity changes and femoral head flattening/tapering. Inter-observer (Cκ = 0.846) and intra-observer (Cκ = 0.853 and Cκ = 0.842) agreement was excellent. If treated, mostly intra-articular corticosteroids were administered (16/18). Nine horses were euthanised immediately or during follow-up examination. Post-mortem, the Ligamentum capitis ossis femoris was commonly found ruptured. All surviving horses remained lame. Conclusions: Retrospective analysis of clinical records and subjective outcome assessment based on owner follow-up with potential recall bias. Due to overall disease severity, associations between different grades of clinical findings, radiographic abnormalities and outcome could not be evaluated. Conclusions: Typical clinical signs may indicate CFJOA. Standardised evaluation of ventrodorsal radiographs allows a comprehensive diagnosis. Postmortem findings suggest joint instability as a possible causative factor that may contribute to the poor prognosis and resistance to medical therapy of the disorder.
Publication Date: 2024-01-07 PubMed ID: 38185515DOI: 10.1111/evj.14053Google Scholar: Lookup
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  • Journal Article

Summary

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This research article studies the diagnostic findings and outcomes of horses with coxofemoral joint osteoarthritis (CFJOA). The researchers developed a radiographic score to enable systematic evaluation of the disease and noted the treatments and ultimate outcomes of the horses involved in the study, concluding that CFJOA indicates poor prognosis and an apparent resistance to medical therapy.

Methodology and Criteria

  • The research was developed as a retrospective case series, taking into account horses diagnosed with CFJOA between the years 2002 and 2023.
  • Information collated included historical data, clinical signs observed, findings from ultrasonography and radiography, results from intra-articular anaesthesia, treatment administered, the outcome of the disease, and necropsy results, if available.
  • The researchers designed a radiographic score to categorise the radiographic findings, which was then applied by two independent examiners. This categorisation aimed to provide a systematic approach to assess the severity and progression of CFJOA.
  • Reliability between the two examiners (inter-observer reliability) and consistency by the same examiner (intra-observer reliability) were also evaluated using weighted Cohen’s kappa (Cκ), a statistical measure of reliability for categorical items.

Results of the Study

  • The study involved 24 horses, most of whom displayed chronic lameness. Common signs included unilateral gluteal muscle atrophy, lengthening of the stride of the affected limb, and locomotion on three tracks.
  • Both ultrasound and radiography were able to evaluate periarticular osteophytes, with a significant correlation coefficient of r = 0.64.
  • Radiography further allowed for the detection of irregular joint spaces, changes in subchondral bone opacity, and femoral head flattening or tapering.
  • The inter- and intra-observer agreements, as measured by Cκ, were excellent, suggesting strong consistency and reliability in the evaluation of the radiographic findings.
  • Most of the treated horses (16 out of 18) received intra-articular corticosteroids as a form of therapy. However, nine horses were euthanised either immediately or during follow-up examination, indicating that the disease had severe consequences.
  • In terms of necropsy, a common finding was the rupture of the Ligamentum capitis ossis femoris.

Conclusions

  • Despite the study being based on a retrospective analysis, which could be subject to recall bias from horse owners, the research indicated common clinical signs that may suggest CFJOA, including lameness, muscle atrophy, and altered locomotion.
  • Standardised analysis of ventrodorsal radiographs offers a detailed diagnosis of CFJOA.
  • Necropsy results suggest that joint instability could be a contributing factor to CFJOA, which might explain the poor prognosis and resistance to therapy seen in the affected horses.

Cite This Article

APA
Sauer FJ, Hellige M, Beineke A, Geburek F. (2024). Osteoarthritis of the coxofemoral joint in 24 horses: Evaluation of radiography, ultrasonography, intra-articular anaesthesia, treatment and outcome. Equine Vet J. https://doi.org/10.1111/evj.14053

Publication

ISSN: 2042-3306
NlmUniqueID: 0173320
Country: United States
Language: English

Researcher Affiliations

Sauer, Fay J
  • Clinic for Horses, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany.
Hellige, Maren
  • Clinic for Horses, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany.
Beineke, Andreas
  • Department of Pathology, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany.
Geburek, Florian
  • Clinic for Horses, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany.

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