The anterior surface of calcaneus is consists of several curves. These accommodate the tarsal bones and talus. On the other hand, the posterior (back) part of the calcaneus features just a medial process and tuberosity.
Basically, bones serve as attachment site for skeletal muscles, tendons and ligaments, which allow generation of movement. For the calcaneus bones, it is the insertion point for the muscles: abductor digit minimi and abductor hallucis. The Achilles tendon also inserts into the superior (top) surface of the posterior part of the calcaneus.
The Fractured Calcaneus
Sixty percent (60%) of the recorded tarsal bone fractures are specifically injuries involving the calcaneus bone. Calcaneus is smaller compared to the other bones in the lower extremity. However, a fractured calcaneus can leave you disabled.
Calcaneus fractures are often caused by high-impact collision such as falling, vehicular accident or even a twisting foot injury. Symptoms of calcaneus fracture include:
Swelling, bruising and painful heels;
Deformity of the heels;
Inability to walk; and
Discomfort when putting weight on the heels.
In other cases, people with fractured calcaneus can still walk. However, the activity of the muscles and Achilles tendon in supporting the body weight is dependent to the condition of the calcaneus. When the calcaneus is damaged, both the muscles and involved tendon cannot generate sufficient force to support the overall body weight, making the affected individual ambulate differently due to the instability of the foot and ankle.