Osteoarthritis Clinical Trial
Official title:
The Influence of Leg Length Discrepancy After Total Hip Arthroplasty on Function and Quality of Life
Leg length discrepancy (LLD) is a complication of THA and may result in patient
dissatisfaction, gait disorder, greater trochanter pain, low back pain. In the literature,
LLD is reported to vary widely among studies e.g. 6 to 35 mm. However, the threshold at
which a LLD is clinically important is still a matter of debate. The aim of this study was
to determine the influence of non-corrected LLD after THA on patients' reported hip function
and quality of life. This prospective cohort study was conducted at Sundsvall Teaching
Hospital in Sweden after it was approved by the regional ethics committee at Umeå University
(No. 07-052M and No. 12-287-32M). Between September 2010 and April 2013, all patients with
unilateral primary osteoarthritis (OA) treated with THA were considered for inclusion.
Informed consent was obtained from all patients. Patients with secondary OA, previous
spinal, pelvic, or lower limb injuries or fractures were excluded.
The primary outcome measure was the Western Ontario and McMaster Universities Osteoarthritis
(WOMAC) Index that measures functional outcome (ref). The secondary outcome measure was the
EQ-5D and visual analogue scale (VAS) scale. Patients were assessed preoperatively and at
follow-up at 1 year postoperatively. The posterolateral approach was used in all operations.
LLD was measured on the postoperative x-rays. patients were divided into three groups:
shortening group where the operated leg was more than 5mm shorter compared with the
contralateral side, the restoration control group where the operated leg was within 5mm
shortening and 9mm lengthening compared with the contralateral side, and the lengthening
group where the operated leg became more than 9mm longer compared with the contralateral
side.
n/a
Observational Model: Cohort, Time Perspective: Prospective
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