Modern medicine defines pes cavus as a condition where the longitudinal arch of the foot is formed abnormally high. This structural deformity is not simply a matter of foot shape; it causes significant disturbances in the foot's normal biomechanics and can affect overall health.
The first noticeable issue involves weight-bearing. A normal foot evenly distributes body weight across the entire sole while absorbing impact. In pes cavus, the contact area between the sole and the ground is markedly reduced, concentrating body weight mainly on the heel and the ball of the foot (metatarsal head), much like wearing pointed high heels. When excessive pressure persists on specific areas, chronic stress affects the soft tissues and bones of the sole, causing diverse pains. Most commonly, conditions such as plantar fasciitis, metatarsalgia, and Achilles tendinitis occur, and severe cases can lead to stress fractures.
Furthermore, a high arch creates an imbalance in the muscles and ligaments that support and move the foot. As the intrinsic muscles supporting the sole become excessively tense or weakened, the flexibility of the foot decreases. Deformities such as claw toe or hammertoe, where the toes curl downward, may also accompany this condition. These deformities cause the toes to rub against footwear, forming calluses or corns, and alter gait patterns to bring greater discomfort.
From a neurological perspective, pes cavus also carries important significance. The plantar nerve is highly sensitive to pressure, and the abnormal pressure distribution caused by pes cavus can compress and irritate nerves, leading to neuralgia. In particular, the risk of developing an interdigital neuroma, where the nerve between the toes thickens and causes pain, increases. Tingling sensations, numbness, and paresthesia can stem directly from this nerve compression.
Moreover, the feet serve as our body's foundation and are the first area to absorb ground reaction force. When the foot's shock-absorbing capacity drops due to pes cavus, that impact is directly transmitted up to the ankles, knees, hip joints, and even the lower back or spine, much like striking a hard floor repeatedly instead of landing on a soft mattress. This causes alterations in gait patterns and consecutively induces misalignment of the lower extremities, raising the risk of various musculoskeletal diseases such as knee osteoarthritis, hip joint pain, and lumbar disc herniation. A small structural problem of the foot ultimately ends up disrupting the alignment and balance of the entire body.
In conclusion, pes cavus is not merely a question of foot shape, but a complex condition that can cause systemic pain and discomfort through hypofunction of the foot. Paying attention to foot pain and protecting your foot health through consistent management and appropriate treatment is an essential first step toward the health of your entire body.
