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Entitlement Eligibility GuidelinesPes Planus
DefinitionPes Planus is a deformed foot in which the position of the bones relative to each other has been altered, with lowering of the longitudinal arch. For the purposes of this guideline, acquired and congenital Pes Planus will be addressed. This guideline does not include anterior flat foot. Acquired Pes Planus means a deformed foot in which the position of the bones relative to each other has been altered with the lowering of the longitudinal arch but does not include congenital Pes Planus. Congenital Pes Planus means a deformed foot present at or soon after birth in which the position of the bones relative to each other has been altered with the lowering of the longitudinal arch, i.e. hypermobile (flexible) flatfoot, and rigid flatfoot with tarsal anomalies. Diagnostic StandardDiagnosis by a qualified medical practitioner is required. X-ray evidence is often helpful, but not required. There are no medical guidelines as to what is to be considered a "normal arch". Orthopaedists agree that the recorded height of the arch is dependant on both the observer and his/her concept of what is a "normal arch", and on the stance of the person when examined. Back to TopAnatomy and PhysiologyThe tarsal bones correspond to the carpal bones of the wrist, and consist of the seven bones constituting the articulation between the foot and the leg. They comprise the talus, calcaneus, and navicular in the proximal row; and the cuboid and the lateral, intermediate, and medial cuneiform bones in the distal row. These, in their turn, articulate with the metatarsal bones of the foot. The longitudinal arch of the foot lies between the calcaneus (os calcis, heel bone) and the heads of the metatarsals (the long bones of the foot which connect with the toes). The arch is highest medially, having as its apex the navicular bone, and shallowest at the lateral border of the foot where it comes in contact with the floor. Its integrity is maintained by the structure of its component bones, especially the talus and calcaneus, together with ligamentous supports and the general tone of the foot muscles. The foot at birth is normally flat, the arch developing when the infant begins to stand. The longitudinal arch is reduced so that on standing the medial border is close to or in contact with the ground. It is usually associated with some degree of pronation or twisting outward of the foot (valgus deformity or eversion). Normally at the intertarsal joints the play between the various bones is free, with stability largely being maintained by muscle power. The ligaments of the foot become taut and help to restrain further movement at the extremes of the particular movement. If the foot is supple and the ligaments are lax the tarsals may be displaced to an extreme degree before the ligaments are strained. Acute strain is less likely to develop in such a foot as it is in a rigid foot, especially when affected by arthritis. ACQUIRED PES PLANUS can be unilateral or bilateral and includes osseous, ligamentous, muscle imbalance, postural or static, and arthritic flat foot. CONGENITAL PES PLANUS consists of hypermobile flat foot, and rigid flat foot with tarsal anomalies. The foot at birth, which is normally flat, does not develop an arch. Hypermobile flat foot is an hereditary condition in which the mid tarsal and subtalar joints exhibit a greater than normal range of movement, and the deformity disappears when the feet are freed from weight-bearing. In the congenital form of Pes Planus known as Rigid Flat Foot with Tarsal Anomalies there is a bony, cartilaginous or fibrous tissue bridge between the talus and the os calcis, or between the navicular and the os calcis. This anatomical abnormality leads to a faulty pattern of movement between the various tarsal bones. The shape of the foot in this condition has given rise to the name "congenital rocker bottom flat foot". Back to TopClinical FeaturesThe presence of Pes Planus is usually evident upon inspection of the foot. Pes Planus, in the majority of cases, is asymptomatic. There may, however, be symptoms of pain in the long arch or behind the bony protuberance of the inside of the ankle joint. Pain and fatigue may occur on walking and standing. When walking, in order to prevent strain upon the plantar ligaments, the affected individual may avoid raising the heel before the ball of the foot, thereby raising the whole foot at one time. In a hypermobile (flexible) flat foot, there is a short Achilles tendon, which prevents dorsiflexion (raising of the foot) at the ankle joint. The deformity usually becomes manifest in childhood, often in adolescence. Canadian and Israeli army studies refer to flexible flatfoot as common, benign, and a variant of normal. Aggravation is indicated by a permanent acceleration of the disease process, or permanent increase in severity or frequency of signs or symptoms, or the development of secondary changes in the surrounding bones and soft tissues. Increasing complaints which have existed on a continuous or recurrent basis for a period of approximately 6 months may indicate a degree of aggravation (permanent worsening). These include, but are not limited to, the development of callosities, plantar fasciitis, calcaneal spurs, and foot strain. Back to TopPension Considerations for Congenital and Acquired Pes Planus
References for Pes Planus
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