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Association between hip abductor function, rear-foot dynamic alignment,and dynamic knee valgus during single-leg squats and drop landings

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Background: Preventing anterior cruciate ligament (ACL) injuries is very important for athletes, and dynamic knee valgus is considered a risk factor for non-contact ACL injury. However, little is known about whether the functions of the hip abductor and rear-foot increase dynamic knee valgus. A two-dimensional (2D) video-based screening test focused on hip abductor and rear-foot functions among factors involved in dynamic knee valgus. The present study determined associations between hip and rear-foot dynamic alignment and dynamic knee valgus.
Methods: This cross-sectional study recruited 130 female basketball players (258 legs) from nine high-school teams. The players performed single-leg squats and single-leg drop landings to provide knee-in (KID) and hip-out (HOD) distances on 2D video images. Hip and rear-foot dynamic alignment was evaluated using a dynamic Trendelenburg test (DTT) and a dynamic heel-floor test (HFT).
Results: The Chi-square test revealed no significant difference in the prevalence of DTT-positivity between single-leg squats (28.7%) and singleleg drop landings (23.3%). The prevalence of HFT-positivity was significantly greater during landings (51.4%) than during single-leg squats (31.0%, p < 0.01). The KID values for both single-leg squats and single-leg drop landings were greater in the DTT-positive than in the DTTnegative group (15.1
5.4 cm and 20.2
7.5 cm, p < 0.001). The HOD values were similarly greater in the DTT-positive group (15.2
1.9 cm and 17.6
2.8 cm, p < 0.001). The KID values for both single-leg squats and single-leg drop landings were greater in the HFT-positive than in
the HFT-negative group (12.2
5.1 cm, p < 0.01; 14.7
7.2 cm, p < 0.001), whereas HOD values for these tasks did not significantly differ between the two groups.
Conclusion: Dynamic hip mal-alignment might be associated with both greater KID and HOD, whereas rear-foot eversion is associated only with greater KID. Hip abductor and rear-foot dysfunction are important factors for dynamic knee valgus and thus evaluating DTT and HFT will help to prevent dynamic knee valgus.

Keywords: 2D screening test; ACL injury; Dynamic alignment; Hip abductor and rear-foot function; Prevention

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Informasi Detail

Judul Seri

Journal of Sport and Health Science

No. Panggil

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Penerbit

: Shanghai University of Sport., 2015

Deskripsi Fisik

Journal of Sport and Health Science 4 (2015) 182e187

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

Sport And Kesehatan

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

Versi lain/terkait

Lampiran Berkas

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