Hip Dislocation Clinical Trial
Official title:
"True Incidence of Hip Dislocation After Primary THA - a Nationwide Population Study"
The primary objective is to report the true incidence of hip dislocations in primary THA
patients within 2 years of index surgery.
Secondary, patient and component characteristics (age, sex, comorbidity, cemented/uncemented,
approach, head diameter) are analyzed as potential risk factors for dislocation. Specific
components may be analyzed based on number.
Based on published literature and personal experience, most hip surgeons have an assumption
of the degree of hip dislocation. This will be the first study to reveal the actual extent of
this specific complication in a large population. It will give surgeons knowledge of the
current standards -both on a national and hospital level. Depending on the results and
comparisons to relevant countries, the investigators will be able to either substantiate or
forced to rethink current procedures. This applies to both surgical access and use of
specific components.
Since the vast majority of dislocations appear within 1-2 years after primary surgery (29),
the follow-up period will be 2 years. By applying the National Patient Registry the
investigators are able to identify any type of patient contact with the hospital system
throughout Denmark in these 2 years. Patients assigned with correct diagnostic and procedural
codes for dislocation and reduction are identified. However, the investigators will also find
the cases of dislocation that are incorrectly coded in the registry. Therefore, the
investigators will manually look in all the patient files from orthopedic contacts regardless
of assigned diagnostic and procedural codes. Additionally, emergency room and internal
medicine contacts are scanned with a broad and comprehensive range of relevant hip- and
dislocation-related codes to identify episodes of hip dislocation, which are incorrectly
coded. These patient files will also be manually reviewed.
If a patient is revised within the first 2 years, the follow-up period ends on the revision
date. Revisions are also registered in the Danish Hip Arthroplasty Registry. However, the
completeness is 93-95% and therefore lower than for primary operations. In order to have the
complete set of revisions, the investigators will enrich our data with an extraction from the
National Patient Registry by applying all approved hip revision codes
;
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