Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: General Orthopaedics
Abstract number: 25568
KINEMATIC AND KINETIC CHANGES DURING WALKING IN PATIENTS WITH
HALLUX VALGUS
Kao-Shang SHIH 1 , CHU-FEN CHANG 2 , Tung-Wu LU 2
1 Orthopaedic Department, Far Eastern Memorial Hospital, Taipei (TAIWAN),
2 Institute Of Biomedical Engineering, National Taiwan University, Taipei (TAIWAN)
OBJECTIVE: Hallux valgus (HV) may not only alter the foot alignment, but also result
in functional changes in biomechanics of lower limb. Therefore, this study aimed to
evaluate the effects of HV on gait. MATERIALS AND METHODS: Ten patients with
HV (age: 45±11.8 years, hallux abductus angle: 28.63±5.99°) and 12 healthy females
(age: 50.4±8.5 years) participated. Each participant walked for 3 times while their
kinematic data measured by a 7-camera motion capture system (Vicon 512) and the
ground reaction forces (GRF) recorded by two AMTI forceplates. Peak joint angles
and moments between groups were analyzed using Student’s t-test with a
significance level of 0.05. RESULTS: Compared to control group, patients with HV
displayed less anterior pelvic tilt and greater pelvic rotation, greater hip internal
rotation, greater knee flexion, and greater ankle internal rotation and abduction.
They also showed increased peak moments of knee extensor as well as decreased
moments of knee abductor, ankle abductor and ankle internal rotator. DISCUSSION
AND CONCLUSION: Increased ankle internal rotation was closely related to greater
foot pronation and toe-in gait. Greater pelvic and hip rotation would advance foot
pronation and aggravate HV. Significant toe-in gait had been found to decrease the
medial GRF and further reduce the knee and the ankle abductor moments.
Although there was only abnormal alignment of big toe, feet with HV would affect the
kinematic and kinetic changes of lower limbs during gait.
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