Dynamic midfoot kinematics in subjects with medial tibial stress syndrome.
BACKGROUND
Medial tibial stress syndrome (MTSS) is a common diagnosis. Several studies have demonstrated that excessive static navicular drop (ND) is related to the diagnosis. However, no studies have yet investigated ND and the velocity of ND during dynamic conditions. The aim of this study was to evaluate ND characteristics in patients with MTSS in dynamic and static conditions.


METHODS
In a case-control study, 14 patients diagnosed as having MTSS were included from an orthopedic outpatient clinic. A control group consisting of 14 healthy participants was matched regarding age, sex, and typical sporting activity. Navicular drop was evaluated during treadmill walking by a two-dimensional video analysis. Static foot posture, static ND, dynamic ND (dND), and velocity of dND were compared.


RESULTS
The two groups were comparable in relation to age, sex, height, weight, and foot size. No significant difference was found in static foot posture. Static ND showed a mean difference of 1.7 mm between the groups (P = .08). During treadmill walking, patients with MTSS had, on average, a 1.5-mm-larger dND (P =.004) and a 2.4-mm/sec-larger mean velocity of dND (P = .03).


CONCLUSIONS
Patients with MTSS display a larger ND and a higher ND velocity during treadmill walking. Increased ND velocity may be important to this condition. Future studies should include velocity of dND to investigate the mechanisms of dND in relation to overuse injuries.
Orthopaedic Surgery Research Unit, Aarhus University Hospital-Aalborg Hospital, Aalborg, Denmark. michaelrathleff@gmail.com
Michael S
MS
Rathleff
Luke A
LA
Kelly
Finn B
FB
Christensen
Ole H
OH
Simonsen
Søren
S
Kaalund
Uffe
U
Laessoe
D000328:Adult; D001696:Biomechanical Phenomena; D016022:Case-Control Studies; D012090:Cumulative Trauma Disorders / Q000503:physiopathology; D005260:Female; D005528:Foot / Q000503:physiopathology*; D006801:Humans; D008297:Male; D010146:Pain / Q000503:physiopathology*; D010173:Palpation / Q000009:adverse effects; D013639:Tarsal Bones / Q000503:physiopathology*; D013977:Tibia / Q000503:physiopathology*; D016138:Walking / Q000502:physiology*; D055815:Young Adult