Foot & Ankle International - 2017 FAI Supplement - 48S

during microfracture may irreversibly change the joint
loading support of the ankle, leading to reparative cartilage degradation. The purpose of this study is to investigate the morphological change in the SCB and SCBP after
microfracture for OLT by developing a novel magnetic
resonance imaging (MRI) scoring system specifically for
evaluating SCB and SCBP.
Methods: Twenty patients who underwent microfracture for
OLT and had at least a one year follow-up 3-Tesla MRI
between 2008 and 2011 were selected. A SCB Health scoring system was developed to assess the condition of the SCB
using 3-Tesla MRI. The SCB Health score is based on the
amount of edema, subchondral cyst diameter, qualitative
change in SCBP morphology and thickness change of the
SCBP (Table 1). Nine of the twenty patients had two followup MRIs, and differences in their scores were calculated.
The clinical evaluation was assessed using the Foot and
Ankle Outcome Scores (FAOS) preoperatively and at final
follow-up.
Results: At first follow-up MRI, 65% of patients had mild
or greater edema, 40% had subchondral cysts, 65% had

irregularity or collapse of their SCBP and 85% had a >25%
change in SCBP thickness. The overall SCB Health score of
90% of patients were abnormal. Of the nine patients who
had a subsequent follow-up MRIs, the mean time between
the first and second study was 22±6 months. The scores
between the two time points were not statistically significant (p=0.347, p=0.559, p=0.169, p=0.347 p=0.154 for
edema, subchondral cyst diameter, qualitative SCBP measurements, SCBP thickness change and overall SCB Health
score, respectively). The mean FAOS score improved significantly from 55.5±16.8 preoperatively to 76.0±12.3 at
final follow-up (p<0.05).
Conclusion: The SCB and SCBP were not completely
healed in 90% of patients at a mean 18 months follow-up
following microfracture of the talus. Subsequently, morphological changes were not restored at a mean 43 months
at second follow-up in a smaller subset of patients. Most
previous studies have focused on the degeneration of the
articular cartilage layer, and its effect on clinical outcomes.
The authors of current study believe that looking at the
changes in the SCB may provide additional information as
to why BMS procedures fail in the long-term.

Foot & Ankle International, 38(S1)
DOI: 10.1177/1071100717S00046
©The Author(s) 2017

Felipe Palma, PT, Rodrigo Guzman-Venegas,
MSc

Peroneal Tendon Tears: 50% Rule,
a Myth? Biomechanical Cadaveric
Evaluation

Keywords: peroneal tendon tears, tenodesis, tendon repair,
50%, biomechanics

Emilio Wagner, MD, Pablo Wagner, MD, Diego
Zanolli de Solminihac, MD, Cristian Ortiz, MD,
Andres Keller Díaz, MD, Ruben Radkievich, MD,
48S

Category: Ankle,Basic Sciences/Biologics,Sports

Introduction/Purpose: Peroneus brevis tendon tears are
frequently diagnosed when ankle instability is present. No
clear guideline exists as to when to repair or resect peroneal
tendon tears, as most of the available literature uses Meyer's
work published in 1924 where a risk of spontaneous rupture
Foot & Ankle International 38(1S)

Table of Contents for the Digital Edition of Foot & Ankle International - 2017 FAI Supplement