Article

Stress fractures are common in athletics and are more prevalent in women. The
current literature has not identified a reason for this gender difference. We
hypothesized that females with a history of a second/third metatarsal stress
fracture will demonstrate differences in ankle kinematics, kinetics and ground
reaction forces when compared with a group of age-matched females with no stress
fracture history. A total of 15 control females and nine females with a history
of a second/third metatarsal stress fracture were asked to run at 3.3m/s+/-5%
along a 10-m runway. Kinematics and kinetics were obtained using an 8-camera
motion analysis system (240Hz) and two force plates (1200Hz). Significant
differences existed in height and weight between the groups. No other
statistically significant differences existed between the fracture group and the
control group. Kinematic measurements do not differ significantly between women
with a history of second/third metatarsal stress fracture and female control
subjects. The reported kinematic and kinetic measurements do not appear to be
influenced in subjects with metatarsal stress fractures, which likely result from
the complex relationships between the joints in the foot and ankle. The
development of second/third metatarsal stress fractures could result more from
over training or changes in plantar loading instead of changes in lower extremity
joint kinematics while running.
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Langue : ANGLAIS