Shoe Wear Suggestions Meant For The Elder Adult
The objective of this assessment is to offer healthcare practitioners as well as the general community with recommendations about shoe wear that would possibly successfully focus on a quantity of of the common healthcare concerns experienced by elder adults. These subjects comprise mediocre equilibrium, slipping, risk for falling, shock absorption, knee osteoarthritis, hallux rigidus, as well as normal fit specifications. A large amount of the data provided in this article reflects current literature on the subjects, as well as a number of suggestions coming up from thirty years of clinical practice that has concentrated on the medical care of foot, ankle, and other lower-extremity patient problems.
Scientific experience indicates that one caveat to the recommendation that elder individuals wear shoes with diminished heel lift involves an older person who has ankle joint equinus, or especially constrained dorsiflexion that borders on a plantar flexion contracture. Elder individuals who possess such pronounced stiffness in the triceps surae muscle set probably will go through a posterior dislocation of the center of pressure toward their heel, placing them at risk for falling backwards. One of my previous elder patients received advice from a geriatric health center that she should quit wearing her ruby-red high-heeled shoes for fear that she might fall if she continued to wear these much loved shoes. She complied with the clinicians’ desires and proceeded to undergo quite a few falls backwards. Assuming confined capacity to elongate the tight triceps surae tissues, these patients should be encouraged to wear shoes with ample heel lift to accommodate their posterior soft-tissue tightness, without utilizing so much heel lift that they incur the unfavorable results experienced by older subjects during the formerly reviewed scientific studies. Determination of this acceptable heel lift may involve a little experimentation on the part of the affected person and the clinician, which could be achieved by utilizing pieces of heel-lift material inside the shoe, either until the patient subjectively reports feeling stable in all directions, or until the clinician can impartially record stability with scientific tests such as the Functional Reach Test4 and the Reach in Four Directions Test. So, heel lift should not be extremely elevated, nor very low, but just right (much akin to Goldilocks’ penchant for porridge).
Stiffness of the sole elements is another shoe design characteristic that can have an effect on stability. Menant and colleagues pointed out that use of shoes with a softer sole hardness resulted in increased postural adjustments to improve medial-lateral balance as compared with footwear with a more basic sole hardness. The detrimentaleffects of softer sole material on gait stability was supported by supplementary details from Menant et al. Shoes that have abnormally soft sole material may well produce an unstable support surface, in so doing adversely influencing steadiness in older individuals.
Additional shoe design features that might influence steadiness are width of the shoe’s sole material and height of the upper material on the foot and ankle. Medical experience revealsthat older persons have increased medial-lateral stability when the sole material of their shoes is wider. Wider sole material provides a wider base of support and ensures that the person’s center of mass is more apt to fall within that enhanced medial-lateral base of support. Shoes with heel lift often have a decreased width of their sole material, thereby adversely affecting medial-lateral stability. Menant and colleagues have demonstrated in varied reviews that high-collar shoes, or shoes that have upper materials extending more superiorly on the foot and ankle, elicited more steady gait characteristics and increased standing stability. Lord et al furthermorereported that these shoes elicited diminished postural sway, enhanced limits of stability, and had improved stability than lower-collared shoes. These shoes may have a positive consequence on stability by assisting ankle musculature with anterior-posterior and medial-lateral balance about the ankle joint and proximal joints of the foot.
In the previous few years, quite a few of my patients have asked my view regarding a novel shoe that has been well marketed, namely footwear with a rocker-bottom structure. A well-known example of this type of shoe is the MBT® (Masai Marketing & Trading AG, Switzerland), which has a convexity of the sole material such that the height of the convexity is midway between the heel and toe of the shoe. This shoe model efficiently creates a negative heel with less sole material beneath the individual’s heel than the thickness of sole material in the center of the foot. Albright and Woodhull-Smith recognized very lately that this shoe structure created anterior-posterior insecurity during laboratory testing when a sudden anterior perturbation was imposed on their subjects. As suggested earlier, utilization of this shoe by older individuals who have especially tight triceps surae would very likely yield higher risk for falling backwards. A second kind of rocker-bottom design involves shoe sole material that has a moderately basic heel structure and a rocker-bottom curve in the forefoot area of the shoe. An example of this shoe is the Etonic Minado®. This shoe design feature will be referred to later in this editorial as a desirable intervention for the generally painful condition of hallux rigidus. In response to a sudden forward perturbation of the center of mass, such as being “bumped” from behind while standing or on foot, nevertheless, this shoe design also may produce anterior-posterior unsteadiness.
In summation, shoe characteristics that can assist an older individual with stability are: avoiding footwear with greater heel heights unless the patient has a severe ankle dorsiflexion problem of the ankle joint; avoiding excessively soft sole material; avoiding rocker-bottom sole designs; and selecting footwear with wider sole material and a more preferable collar of the upper components. Ultimately, merely wearing shoes as opposed to walking in bare feet will strengthen equilibrium, especially in older individuals who have impaired balance.
The next shoe construction characteristic that might have influence on an older individual slipping on a support surface may be likened to automobile tire expertise, particularly depth and width of the tread furrow in the sole material. Li, Wu, and Lin introduced exclusive suggestions and a nice evaluation of applicable literature that indicates that shoe sole material with wider and deeper tread grooves supply better coefficients of friction and, as a consequence, superior resistance against slipping on floors that have liquid-contaminated conditions such as water, grease, or a detergent/water solution. The wider and deeper treads enable greater drainage of the fluid from the shoe/floor boundary, thus enabling improved contact between the shoe sole material and the floor surface, and an associated larger coefficient of friction for the two-surface interface. Li and Chen provided additional reinforcement for the use of shoe sole materials with wider tread grooves. Each of the formerly reviewed reviews indicated that sole groove deepness and width may be less influential in protecting against slipping when the floor surface is tainted by oily liquids.
Older individuals who are living in chillier climates are constantly faced with the danger of slipping when walking out of doors on ground surfaces covered with ice. Gao et al have investigated this subject with particular interest given that many of the elder populace in Sweden are injured as a result of falls on icy ground-covered surfaces. The investigators assessed nature, roughness, and hardness of the sole materials with regard to the coefficient of friction on ice. Just coarseness was positively connected with the coefficient of friction, signifying that shoes with rougher (vs exceedingly smooth) sole surfaces may well be protective for persons who walk on icy surfaces.
Another technique for prevention of slipping and falls on icy surfaces involves wearing a product such as the commercially-available Yaktrax Walker® (Yaktrax, LLC; Durham, NC). This piece of equipment consists of an elastic mesh that is donned over footwear or boots that will be worn on icy outdoor surfaces. Metallic coils are wrapped about the elastic mesh on the sole facade of the gadget. A report by McKiernan demonstrated that wearing this device may scale back the chance of falls outdoors throughout wintry weather for older individuals. Individuals should be warned against wearing this device on solid indoor surfaces such as tile, since the coefficient of friction among the metallic coils and a hard interior floor would be considerably low and related with critical probability for slipping. Older individuals may not want to be bothered with donning and removing this coil-like device. This author recommends that the device be applied to a pair of shoes that are dedicated for out of doors use throughout the time of the winter months so that the device would not have to be removed from the shoes as often.
Ultimately, though having naught to do with shoe construction characteristics, a very straightforward intervention for prevention of slipping on any surface consists of walking with a smaller step length. A condensed step length results in a lesser-magnitude anterior shearing (slipping) pressure imposed on the supportive surface by the shoe. A reduced step size additionally guarantees that the standard component of the ground reaction force will be larger, thus effecting a greater frictional force that will resist anterior slipping. Cooper and colleagues have recognized that as step length increases, the required coefficient of friction to avoid slipping increases because of the formerly reviewed influences of step length on the shear and standard forces.
In summation, shoe construction options that could be protective against slipping include avoiding extremely rigid sole surfaces, wearing shoes with deeper and wider tread grooves, and wearing shoes with rougher surfaces on the sole materials.
Risk for Falling
Tencer and colleagues considered the equivalent 1371 subject sample taken by Koepsell et al with regard to the biomechanical components of the footwear worn by the subjects. Greater heel height was associated with elevated probability of falling, supporting previously reviewed research that indicated increased unsteadiness with equilibrium testing when subjects wore shoes with greater heel height. Greater surface region of the sole material, at the same time, was linked with reduced risk of falling in subjects followed by Tencer and colleagues. As was reviewed in the segment on equilibrium, greater surface area that is resultant from greater anterior-posterior and medial-lateral dimensions of the shoe’s sole material ought to ensure that the patient’s center of mass is more liable to fall within the base of support of the shoe’s sole material.
Finally, Kerse et al prospectively considered 606 older adults (mean age, 83 yr) living in residential care facilities. Subjects who wore slippers were at greater danger for falls as in comparison with subjects who wore shoes. Of the limited information available in terms of risk for falls, then, older adults could reduce their risk of falling by wearing shoes and avoiding walking indoors either in bare feet or in socks alone, by wearing shoes that have lower heel heights and elevated surface area of the sole material, by wearing athletic-type footwear rather than different shoe varieties, and by means of wearing footwear rather than slippers.
The capability of shoe materials to work as a shock-absorbing mechanism is founded on concepts of simple Newtonian mechanics set in the impulse-momentum equation:
F * ?t = m * ?v, where the ground reaction force (F) imposed on the shoe and the body acts over a period of time (?t) to change the downward and forward velocity components (?v) of the body’s bulk (m).
The key, as a consequence, to minimizing the extent of the ground result pressure entails the warp of shoe sole elements over the longest interval of time possible, since the right part of the equation is comparatively constant, assuming secure body mass and regular modifications in velocity. This necessitates that the shoe sole materials possess mid-range stiffness values. Sole materials that are either very stiff or that possess too little hardness will warp over a notably shorter period of time, ensuing in larger magnitude ground reaction forces. So not only heel height but also stiffness of the shoe’s sole materials can make a shoe “just right.”
For the athletic-type footwear that are protective against falls, shoe manufacturers effort to attain lessening of ground reaction forces by incorporating air or gel cells inside of the sole materials to prolong the time of deformation. Alternatively, ethylene vinyl acetate (EVA) foam within the sole materials that has typical stiffness will prolong the time of deformation, thus minimizing the magnitude of the ground reaction forces. EVA functions as an effectual shock-absorbing substance by way of the stream of air through interconnecting cells within the material. The capability of EVA to operate as an effective shock absorber is compromised with constant utilization, as the minute air cells collapse or the thickness of the EVA is reduced. Even-Tzur and colleagues used finite element analyses to simulate deterioration of EVA substances, and they concluded that decreased thickness of the EVA material was the most important component in repeated-use simulations that explained increased stress imposed on the human heel in ground force. This would indicate that elder individuals who would possibly benefit from shock absorption should be cautioned to choose athletic-type footwear that have thicker sole materials, with moderate hardness values (based on the “thumb or pen deformation assessment”), and should switch these shoes following long term usage. Although not diametrically similar to utilize for going for walks, Cook et al demonstrated that the running shoes they examined retained roughly 70% of their shock-absorbing capability after volunteers had run 500 miles in the shoes. Footwear that had been initially top-quality in terms of their shock-absorbing functions had a more prompt decline in shock-absorbing potential with use as compared with shoes that were less advantageous shock absorbers prior to use.
An additional issue that relates to the ability of shoe sole materials to function as shock absorbers involves ambient air warmth. Dib and colleagues used a mechanised contact tester and assessed footwear designed with air cells, gel cells, and EVA shock-absorbing strategies. All of the shoes that were verified demonstrated significant and exponential reductions in shock-absorbing capacity, as shoe temps decreased in 10-degree increments from +50 degrees C to -20 degrees C. The greatest decrements in shock-absorbing capability with reductions in temperature were seen at the chillier end of the temperatures examined. The scientific implications for elder patients who require shock-absorbing capability from their footwear is to carry out weight-bearing exercise at home rather than out of doors during durations of colder weather.
Consistent with the earlier designated connection between foot and knee mechanics, investigators have successfully used medially-wedged inserts to promote relative supination within the foot and diminished valgus loading at the knee for persons with valgus malalignment and lateral compartment knee OA. So also, laterally-wedged insoles inside of the shoe have productively driven foot pronation and decreased varus knee loading for persons who have varus malalignment and medial compartment OA. Patients with medial compartment OA, therefore, have benefited from wearing very bendable footwear with laterally-wedged insoles. Conversely, patients with lateral compartment OA could benefit from medially-wedged insoles worn in very accommodating shoes that would promote supination of the foot.
The concluding shoe design feature that might influence knee joint loading is heel lift. Kerrigan et al studied older and more youthful females who wore commonplace shoes and shoes with 3.8-cm (1.5 in) heels. The two groups of females demonstrated greater varus loading and increased flexion loading at the knee for the duration of walking trials in the higher-heeled footwear. Shoes with elevated heels, therefore, would be contraindicated for patients who experience medial compartment knee OA or patellofemoral joint OA. Wearing these shoes would place higher demands for quadriceps muscle tightening, thereby increasing contact pressures traversing the patellofemoral joint articulation. Higher heels likely give off these outcomes , since plantar flexion is a component of supination, which promotes varus malalignment at the knee. Elevated heels additionally promote knee flexion, resulting in ground reaction forces being located more posterior to the knee joint center, thereby increasing knee expansion moment demands from the quadriceps muscle. A report by Toda and colleagues supports most of the details relative to heel lift and wedged insoles by demonstrating that some of the beneficial outcomes of laterally-wedged insoles for decreasing varus loading in subjects with medial compartment OA were negated when they used these insoles in shoes with higher heels.
Grady et al retrospectively considered 772 patients with this condition and recommended intervention with a rocker-bottom sole configured similar to the one combined with a shoe that has stiff sole components. Haddad has made analogous suggestions. Scientific experience suggests that the particular shoe position where solidity is desired in the sole materials is at the toe interruption, or the forefoot region of the shoe that bends at terminal stance. The firmness of the toe break can be assessed manually. If further firmness is desired to protect the initial MTP joint from extension, a rigid innersole can be added inside of the shoe, a rigid plate can be integrated into the sole materials by a shoe repair shop, or a rigid plate can be added to the plantar exterior of a foot orthosis.
Fundamental Fit Strategies and Fixation