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· DOS Abstracts
Improved function and relief of pain after THA is
not translated into increased daily physical activity
one year after surgery.
Marianne Tjur, Steffan Tabori Jensen, Torben Bæk-Hansen, Inger Mechlenburg ,
Maiken Stilling
Orthopaedic Research Unit, Aarhus University Hospital; Department of Ortho-
paedics, University Clinic for Hand, Hip and Knee Surgery, Regional Hospital,
Holstebro; Department of Orthopaedics, University Clinic for Hand, Hip and
Knee Surgery, Regional Hospital, Holstebro; Orthopaedic Research Unit, Aarhus
University Hospital; Department of Orthopaedics, University Clinic for Hand,
Hip and Knee Surgery, Regional Hospital, Holstebro
Background:
Total Hip Arthroplasty (THA) relieve pain and increase function
in patients with hip osteoarthritis (OA). Yet, it is unclear if THA leads to higher
levels of daily physical activity (PA).
Purpose / Aim of Study:
To describe changes in objectively measured PA, and
self-reported pain and function until one year after THA in an elderly population.
Materials and Methods:
20 patients (11 males, mean age 75+/-5) with hip
OA received a Dual Mobility THA. PA was monitored during two-week periods
using a tri-axial accelerometer mounted on the lateral thigh. % time sitting and
standing, transfers from sit to stand (nrSSTs) and daily steps was estimated us-
ing a MatLab algorithm. Self-reported function and pain were obtained using
Oxford Hip Score (OHS) and Visual Analog Scale (VAS). All measures were col-
lected pre-operative (BL), 3 and 12 months after surgery.
Findings / Results:
Sitting time decreased from 64% (SD: 12%) at BL to 58%
(SD: 11%) at 3 months (p=0.01) followed by an increase to 66% (SD: 12%)
at 12 months (p=0.01). Standing time increased from 26% (SD: 10%) at BL
to 32% (SD: 11%) at 3 months (p=0.004) but decreased to 25% (SD: 10%)
at 12 months (p=0.01). OHS increased from 24 (IQR= 8) at BL, to 38 (IQR:
6) at 3 months (p<0.001), and 46 (IQR:6) at 12 months (p<0.001). VAS at
rest decreased from 3.5 cm (IQR: 3 cm) at BL to 1 cm (IQR: 0 cm) at 3 months
(p<0.001) and 0 cm (IQR: 0 cm) at 12 months (p<0.0001). VAS during activ-
ity decreased from 7 cm (IQR: 4 cm) at BL to 1 cm (IQR: 1 cm) at 3 months
(p=0.0001) and 0 cm (IQR: 0 cm) at 12 months (p=0.0001).
Conclusions:
Although patients’ hip pain and function improved one year after
surgery, PA only increased up to 3 months, and then dropped to BL levels. This
indicates that improved function after THA has a potential to be translated into
PA, but this conversion does not seem to take place on the long term.
No conflicts of interest reported
152.