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168
· DOS Abstracts
Incidence of heterotopic ossification following
total joint replacement of the trapeziometacarpal
joint
Andrey Kovalev, Lone Kirkeby, Torben Bæk Hansen
University Clinic for Hand, Hip and Knee Surgery , Regional Hospital Holstebro,
Aarhus University
Background:
Heterotopic ossification (HO) is a frequent complication after
surgery of the hip and the pelvis, however the pathophysiological entities re-
sponsible for the formation of HO remain largely unclear.
Purpose / Aim of Study:
The incidence of heterotopic ossification (HO) fol-
lowing total joint replacement of the trapeziometacarpal (TMC) joint is un-
known, and the purpose of this study was to study the incidence of HO 12
months after TMC total joint replacement, and the impact of HO on self re-
ported functional outcome.
Materials and Methods:
All patients who had TMC total joint replacement
during the period 2004-2014 were prospectively included in the study with
radiographs 12 months after the operation, and classified using the Brooker
classification adapted to the TMC joint. Self reported functional outcome was
measured with the Disabilities of the Arm, Shoulder and Hand score (DASH
score), and pain at rest and activity using a continous 100- mm visual analog
scale (VAS).
Findings / Results:
A total of 329 TMC joints with implants were egelible for
the study, but 19 joints were excluded because of missing radiographs or due
to loss of follow-up leaving 310 joints for evaluation. The incidence of Brooker
grade 3+4 calcifications was 27% (85/310) at 12 months. Implant fixation
type (cemented vs cementless) did not influence the incidence of HO, but a
significant higher incidence of HO in metal on metal compared to metal on poly-
ethylene articulation was found. We did not find any association between HO
and DASH or VAS at 12 months.
Conclusions:
HO is observed with the same frequency after TMC joint total
replacement as in hip replacement, and articulation with metal on metal seems
to increase the risk of HO. However HO seems not to influence patient reported
outcome or pain at 12 months after the operation.
No conflicts of interest reported
119.