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· DOS Abstracts
Does loss of follow-up bias patient-related
outcome measures of spine surgery performed at
the Sector for Spine Surgery and Research, Region
of Southern Denmark.
Karen Højmark , Christian Støttrup, Mikkel Østerheden Andersen
Rygkirugisk sektor, Ortopædkirurgisk afdeling Vejle, Sygehus Lillebælt
Background:
DaneSpine, the Danish National Spine Register, collects patient-
based pre- and postoperative questionnaires, completed before surgery and
at 1, 2, 5 and 10 years postoperatively. The preoperative data entered into
DaneSpine are entirely patient-based, and include age, sex, height, weight,
duration of back and leg pain on the VAS-scale, SF-36, ODI and EQ-5D. The
database was implemented at the Sector for Spine Surgery and Research on
June 1st 2010. So far preoperative data has been collected on 99.3% of surgi-
cal patients, with a subsequent 1- year follow-up of more than 80%. Loss of
follow-up may bias the outcome assessment of clinical registries.
Purpose / Aim of Study:
To determine whether patient related outcome mea-
sures (PROMs) differed between responders and none-responders.
Materials and Methods:
In order to validate DaneSpine data, we have per-
formed 1-year follow-up on non-responding patients for a 3 months con-
secutive period between 1st of August 2013 until 31st of October 2013. Of
the 262 patients operated in the same period 1-year prior, 217 (82,8%) had
responded, 3 had died and 10 had received other primary spine surgery and
therefore restarted in their registration period. During spring 2014 a structured
interview was performed by telephone on the remaining 32 patients, 2 of which
could not be reached and 2 did not want to participate.
Findings / Results:
We found no difference in PROMs between responders and
non-responders at the Sector for Spine Surgery and Research.
Conclusions:
A 17% loss of 1-year follow-up does not bias conclusions drawn
from PROMs at the Sector for Spine Surgery and Research.
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