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DOS Kongressen 2016 ·
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Dementia as risk factor of Corail stem dislocation
Bjørn Nedergaard, Ahsan Al-Maleh
Orthopaedic , OUH/Svendborg; Orthopaedic, OUH/Svendborg
Background:
Dementia is a neurologic disorder causing cognitive impairment.
The prevalence in Denmark is 80.000 and concern has been raised as to wheth-
er these patients have an increased risk of hip hemiarthroplasty dislocation.
Purpose / Aim of Study:
To determine if dementia is a risk factor of disloca-
tion of Corail stem and Ultima caput.
Materials and Methods:
Retrospective evaluation of patients operated from
01.01.2007 to 31.12.2010 at Svendborg Hospital. Inclusion criteria: Operation
code KNFB02 (primary operation with uncemented distal component of hip
hemiarthroplasty). Exclusion criteria: Death or reoperation within the first year
(both unless the arthroplasty has dislocated first) or dementia state unknown.
After surgery patients were admitted to the geriatric ward and evaluated by the
staff during rehabilitation. If suspicion of cognitive impairment arose, the pa-
tients were assessed at the geriatric out-patient clinic 3 months post-discharge
and potentially diagnosed with dementia. We evaluated patient files for demen-
tia (DF00, DF01, DF03) and dislocation of arthroplasty up to 1 year after the
initial operation.
Findings / Results:
319 patients met the inclusion criteria. 92 were excluded
(49 died < 1 year, 2 were reoperated < 1 year, 41 were lost before geriatric
evaluation). 227 patients (71%) were included of which 68 (30%) had demen-
tia and 159 (70%) did not. 10 (14%) of the patients with dementia dislocated
their arthroplasty within the first year vs. 6 (3%) of the patients without de-
mentia resulting in an OR for dislocation (dementia vs. no dementia): 4,3 [95%
CI 1,53 – 12,64]. There was no difference in age (dementia vs. no dementia)
p=0,81, and no difference in age (+dislocation vs. – dislocation) p=0,75.
Conclusions:
Patients with dementia have 4,3 times higher risk of dislocating
their hip hemiarthroplasty vs. patients without dementia.
No conflicts of interest reported
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