compression loading


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compression loading

forces transmitted to the foot by both body weight and ground reaction forces via the ankle joint during weight-bearing, causing reduction in the height of the medial longitudinal arch (MLA) and countered by extrinsic musculature tendon tension and ligamentous structures within the MLA (Figure 1; see Table 1); the height of the MLA is restored during non-weight-bearing (i.e. when compression loading is non-active) by the natural resilience and elastic recoil of the plantar ligaments, with storage of potential energy against the next episode of compression loading and ground reaction force impact
Figure 1: Soft tissues structures of foot affected by compression loading. This article was published in Neale's Disorders of the Foot, Lorimer, French, O'Donnell, Burrow, Wall, Copyright Elsevier, (2006).
Table 1: Ligaments that support the medial longitudinal arch (MLA)
Anatomical featureLocation
Long plantar ligament (LPL)Plantar aspect of calcaneum (just anterior to calcaneal tuberosity); insert
• Deep portion: into plantar aspect of cuboid
• Superficial portion: base of 2-5 metatarsals
Short plantar ligament (SPL) (plantar calcaneocuboid ligament)Anterior tubercle of calcaneum; inserts into adjacent plantar surface of cuboid
Spring ligament (SL) (plantar calcaneonavicular ligament)Anterior margin of sustentaculum tali; inserts into plantar aspect of navicular
Interosseous ligament (IL) (talocalcaneal ligament)Within sinus tarsi; connects non-articular parts of subtalar joint
Deltoid ligament (DL) (medial collateral ankle ligament)Fans out from anterior, medial and posterior aspects of medial malleolus; insets into navicular, spring ligament, sustentaculum tali and adjacent talus
Plantar aponeurosis (PA) (deep plantar fascia)From calcaneal tuberosity to midfoot, where it splits into five bands
Each band attaches distally to plantar aspect of transverse intermetatarsal ligament (overlying and linking plantar aspects of all metatarsophalangeal joints) and plantar surface of respective proximal phalanx
References in periodicals archive ?
Such curves comprise the densification regime where the failure mechanisms of the foam under compression loading play an important role.
The strain readings were observed for lateral, shear and longitudinal strains in all the gages for all the cracks during the compression loading and the retraction cycle too, to analyse the behaviour of the bone during the stress relaxation.
Compression loading is applied distributed on three holes.
Shear loading is most frequently used, since elastomer in shear provides a linear load deflection response over a greater range of strain than does compression loading.
The applied stress effect on the stress-strain response was investigated through cyclic compression loading with four different applied stress ranges, [DELTA][sigma] = 10, 12, 14, and 16 MPa, respectively.
The samples' mechanical properties were evaluated at room temperature, samples being shaped using a standardized form and subjected to tensile and compression loading conditions, all of them with a speed of 1 mm/min using a LS 100 Plus device from Lloyd Instruments Ltd.
Presumably, the significantly reduced checking due to the boring treatment prior to kiln-drying resulted in the overall stress caused by compression loading to be well distributed.
Wood-plate joints averaged 21 percent higher resistance under compression loading for lodgepole pine than those under tension loading for this substrate.
The SEN specimens were then subjected to uniaxial cyclic compression loading using a sinusoidal waveform.
1a) and the load-bearing capacity of corner joints under compression loading (Fig.
3] retention levels were manufactured using the two PRF adhesives according to ASTM D2559 and tested for shear resistance by compression loading and resistance to delamination during accelerated exposure.