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Technical Brief

Metatarsal Loading During Gait—A Musculoskeletal Analysis

[+] Author and Article Information
Amir A. Al-Munajjed

Musculoskeletal Research,
Anybody Technology,
Niels Jernes Vej 10,
Aalborg 9220, Denmark
e-mail: amir.al-munajjed@gmx.de

Jeffrey E. Bischoff, Mehul A. Dharia

Research and Development,
Zimmer, Inc.,
Warsaw, IN 46581

Scott Telfer

Institute of Applied Health Research,
Glasgow Caledonian University,
Glasgow G4 0BA, UK;
Department of Orthopaedics and Sports Medicine,
University of Washington,
Seattle, WA 98195

James Woodburn

Institute of Applied Health Research,
Glasgow Caledonian University,
Glasgow G4 0BA, UK

Sylvain Carbes

Anybody Technology,
Aalborg 9220, Denmark

1Corresponding author.

Manuscript received May 3, 2015; final manuscript received December 20, 2015; published online January 29, 2016. Assoc. Editor: Kenneth Fischer.

J Biomech Eng 138(3), 034503 (Jan 29, 2016) (6 pages) Paper No: BIO-15-1214; doi: 10.1115/1.4032413 History: Received May 03, 2015; Revised December 20, 2015

Detailed knowledge of the loading conditions within the human body is essential for the development and optimization of treatments for disorders and injuries of the musculoskeletal system. While loads in the major joints of the lower limb have been the subject of extensive study, relatively little is known about the forces applied to the individual bones of the foot. The objective of this study was to use a detailed musculoskeletal model to compute the loads applied to the metatarsal bones during gait across several healthy subjects. Motion-captured gait trials and computed tomography (CT) foot scans from four healthy subjects were used as the inputs to inverse dynamic simulations that allowed the computation of loads at the metatarsal joints. Low loads in the metatarsophalangeal (MTP) joint were predicted before terminal stance, however, increased to an average peak of 1.9 times body weight (BW) before toe-off in the first metatarsal. At the first tarsometatarsal (TMT) joint, loads of up to 1.0 times BW were seen during the early part of stance, reflecting tension in the ligaments and muscles. These loads subsequently increased to an average peak of 3.0 times BW. Loads in the first ray were higher compared to rays 2–5. The joints were primarily loaded in the longitudinal direction of the bone.

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Figures

Grahic Jump Location
Fig. 1

The Glasgow–Maastricht foot model with bones, major muscles (right side), ligaments (left side), and joints. The first metatarsal bone (MT1) with the MTP joint (J1) and the TMT joint (J2) is highlighted separately. Extensor muscles (ExtDig) and tibialis anterior (TibAnt) can be seen on the dorsal side, PF, and flexor muscles (FlexDig), and tibialis posterior (TibPost) can be seen on the plantar side. Note that most of the foot muscles overlap the tarsal region, but do not insert into it.

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Fig. 2

Comparison of EMG measurements (“EMG”) of the peroneus, biceps femoris, rectus femoris, vatus lateralis, soleus, gastrocnemius lateralis, gastrocnemius medialis, and tibialis anterior with predicted muscle activations (“ABT”) from the model

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Fig. 3

First MTP joint reaction force during stance phase in each of the four subjects

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Fig. 4

First TMT joint reaction force during the gait cycle in each of the four subjects

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Fig. 5

Joint reaction forces of all the five MTP joints during stance as average of four different subjects

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Fig. 6

Joint reaction forces of all the five TMT joints during stance as average of four different subjects

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