92 / 225
92
· DOS Abstracts
Medium to Long-term functionality and survival of
HemiCap for hallux rigidus
Mads Holm Møller, Pernille Henszelman Jørsboe, Michael Stage Pedersen, Mo-
stafa Benyahia, Thomas Kallemose, Jeannette Østergaard Penny
Ortopædkirurgisk afdeling, Hvidovre
Background:
Hallux rigidus treated with HemiCap arthroplasty aims to reduce
pain and preserve motion, but no mid/long term results exist.
Purpose / Aim of Study:
To examine the functionality, pain and the revision
rate of HemiCap implants.
Materials and Methods:
106 patients were operated with HemiCap (n=114)
from 2006-2014, median age 53 years (16-80), 37 dorsal flange (DF) im-
plants. A retrospective journal review collected revision data. Preoperative ar-
throsis degree, hallux valgus (HV), intermetatarsal (IM) and Distal Metaphy-
seal Articular Angle (DMAA) were measured. Preoperative pain levels by Visuel
Analog Skala (VAS 1-10), American Orthopaedic Foot and Ankle Score (AOFAS
0-100 points) and Range of Motion (ROM) were available for 51 patients. Of
the initial 106, 70 were eligible for reexamination and 47 partook in a cross sec-
tional follow up where Self-Reported Foot and Ankle Score (SEFAS 0-48 points)
was added to the previous measures. Statistics: Kaplan-Meier survival analysis,
Cox-regression and paired t-tests.
Findings / Results:
At 3, 5 and 7 years, the implant survival was 85%, 83%
and 78%. All revised due to pain. DF, gender, preoperative arthrosis degree, HV,
IM or DMAA did not influence the result. At mean 5 year follow up (n=47)
mean (sd) dorsal ROM was 46(17) degrees, AOFAS was 84(9), VAS 2(1) and
SEFAS 42(6) points. The DF made no significant difference for ROM or PROMs.
23 with pre- op data were re-examined and preoperative dorsal ROM changed
from 21(6) to 42(18) degrees, VAS from 7(2) to 2(2) and AOFAS from 61(11)
to 87(11) (p < 0.001).
Conclusions:
The survival rate was acceptable. No predictors influenced im-
plant failure and new design with dorsal flange is not evident clinically. Un-re-
vised patients have significantly less pain, greater ROM, and better foot and
ankle function than preoperatively, but data are biased by missing numbers.
No conflicts of interest reported
44.