Foot & Ankle International - July 2018 - 861

861

Marsland et al

Figure 4. Graph to show mean tendon displacement during cyclic loading. In both groups, statistically significant displacement
occurred compared with baseline (P < .001), but there was no significant difference comparing groups (P = .35).

Figure 5. Lateral view of a left foot specimen. Tunnel
deformity observed in the specimen that failed during cyclic
testing after interference screw fixation.

Figure 6. Lateral view of a right foot specimen. Deformity after
completion of a load-to-failure test is noted on the inferior side
of the pilot hole, correlating to the site of the screw insertion. In
this specimen, the interference screw pulled out with the tendon.

consistent. All PW specimens failed at the tendon-to-tendon
repair site. All specimens in the screw group failed by tendon pullout, leaving the screw in situ in some cases (n = 6)
and pulling the screw out in others (n = 5). Posttest examination revealed tunnel deformity or fracture in all specimens (Figures 5-7). Pilot hole diameter did not affect tendon
pullout strength significantly: specimens with pilot holes
ranging from 5.5 to 6.0 mm had a mean load to failure of
504.5 N; those with pilot holes 6.5 to 7.0 mm had a mean
load to failure of 493.2 N (P = .9).

Discussion
The current cadaveric study has shown that tendon displacement under cyclic loading and load to failure were
comparable for both the ISF and PW techniques, accepting

Figure 7. Pilot hole fracture after a load-to-failure to test. The
interference screw remains in situ.



Table of Contents for the Digital Edition of Foot & Ankle International - July 2018

Contents
Foot & Ankle International - July 2018 - Intro
Foot & Ankle International - July 2018 - Cover1
Foot & Ankle International - July 2018 - Cover2
Foot & Ankle International - July 2018 - i
Foot & Ankle International - July 2018 - ii
Foot & Ankle International - July 2018 - Contents
Foot & Ankle International - July 2018 - iv
Foot & Ankle International - July 2018 - v
Foot & Ankle International - July 2018 - vi
Foot & Ankle International - July 2018 - vii
Foot & Ankle International - July 2018 - viii
Foot & Ankle International - July 2018 - 1A
Foot & Ankle International - July 2018 - 1B
Foot & Ankle International - July 2018 - ix
Foot & Ankle International - July 2018 - x
Foot & Ankle International - July 2018 - xi
Foot & Ankle International - July 2018 - xii
Foot & Ankle International - July 2018 - 2A
Foot & Ankle International - July 2018 - 2B
Foot & Ankle International - July 2018 - xiii
Foot & Ankle International - July 2018 - xiv
Foot & Ankle International - July 2018 - xv
Foot & Ankle International - July 2018 - xvi
Foot & Ankle International - July 2018 - xvii
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Foot & Ankle International - July 2018 - xix
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Foot & Ankle International - July 2018 - xxvi
Foot & Ankle International - July 2018 - 3A
Foot & Ankle International - July 2018 - 3B
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Foot & Ankle International - July 2018 - Cover3
Foot & Ankle International - July 2018 - Cover4
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