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  • Higher rates of...

Higher rates of hemiarthroplasty dislocation observed in patients with preoperative CEA less than 38.5 & ADWR less than 34.5

Written By : Dr Supreeth D R |Medically Reviewed By : Dr. Kamal Kant Kohli Published On 2023-07-12T20:00:07+05:30  |  Updated On 12 July 2023 8:00 PM IST
Higher rates of hemiarthroplasty dislocation observed in patients with preoperative CEA less than 38.5 & ADWR less than 34.5
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Hip hemiarthroplasty dislocation is a devastating complication. Among other preoperative risk factors, acetabular morphology has been rarely studied. Luigi Zanna et al conducted a study to evaluate the influence of preoperative native acetabular morphology on hemiarthroplasty dislocation. The study was conducted at Department of Orthopaedic Surgery, Aou Careggi, University Hospital of Florence, Florence, Italy. It has been published in “The Journal of Arthroplasty.”

The authors retrospectively reviewed 867 patients who underwent hip hemiarthroplasty for femoral neck fracture. The 380 included patients were treated with an anterior-based muscle-sparing approach. The central-edge angle (CEA) and acetabular depth-to-width ratio (ADWR) of the fractured hip were measured preoperatively on the anteroposterior pelvic view. Receiver operating characteristic curves were performed to analyze the optimal cutoff for CEA and ADWR. Hemiarthroplasty dislocation occurred in 18 patients (4.7%), and the remaining 362 patients were used as the control group.

Key findings of the study were:

• No significant differences in terms of sex, age, dementia, neuromuscular disease, and body mass index were found between the 2 groups.

• Eighteen patients (4.7%) sustained a hip dislocation during the study period, 14 (77.8%) were anterior and 4 (22.2%) were posterior.

• The 18 patients who had a hip dislocation had significantly smaller mean CEA than the control group (P = .0001) (mean 36.1 ± 7.5 and 43.2 ± 5.6 , respectively) as well as ADWR (mean 34 ± 6 versus 37 ± 4, respectively) (P = .001).

• Patients who had neurological comorbidities such as dementia (P = .967) and neuromuscular diseases (P = .382) did not show a higher rate of dislocation.

• Using the receiver operating characteristic analysis, we report significant cutoffs of 38.5 for CEA (P = .0001) and 34.5 for the ADWR (P = .017)

The authors commented – “In conclusion, excluding the dislocation risk factor related to the surgical approach, we advise measuring the CEA and ADWR on preoperative radiographs. In cases of either a CEA smaller than 38.5 or an ADWR smaller than 34.5 or a combination of both, changing the native acetabular morphology implanting a THA might help reduce the risk of dislocation and prevent further operations in an elderly and frail patient. However, when addressing elderly patients who have multiple comorbidities and a short life expectancy, even when they possess preoperative morphological risk factors for a hemiarthroplasty dislocation, the decision to perform a THA instead of a hemiarthroplasty needs to be a multi disciplinary decision.”

Further reading:

Acetabular Morphology Predicts the Risk of Dislocation Following Hemiarthroplasty for Femoral Neck Fractures in the Elderly

Luigi Zanna, Matteo Innocenti et al

The Journal of Arthroplasty 2023

https://doi.org/10.1016/j.arth.2023.02.042

acetabular depth-to-width ratiocenter-edge angledislocationfemoral neck fracturehemiarthroplastypreoperative radiographsrisk factorsLuigi Zanna et alThe Journal of Arthroplasty
Source : The Journal of Arthroplasty
Dr Supreeth  D R
Dr Supreeth D R

    MBBS, Dip. Ortho, DNB ortho, MNAMS

    Dr Supreeth D R (MBBS, Dip. Ortho, DNB ortho, MNAMS) is a practicing orthopedician with interest in medical research and publishing articles. He completed MBBS from mysore medical college, dip ortho from Trivandrum medical college and sec. DNB from Manipal Hospital, Bengaluru. He has expirence of 7years in the field of orthopedics. He has presented scientific papers & posters in various state, national and international conferences. His interest in writing articles lead the way to join medical dialogues. He can be contacted at editorial@medicaldialogues.in.

    Dr. Kamal Kant Kohli
    Dr. Kamal Kant Kohli

    Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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