8.3 Bones, Muscles, and Joints of the Legs and Feet

8.3 Bones, Muscles, and Joints of the Legs and Feet

A Washington pedicure is a lower-limb service. RCW 18.16.020 puts the nails of the feet inside manicuring, and WAC 308-20-080 trains you on cleaning, shaping, and polishing the feet and on electrical appliances you will use near those bones. NIC Domain 2 will ask tarsals, metatarsals, phalanges, and the ankle. The table will ask you not to grind a heel off a calcaneus, not to crank a stiff ankle, and not to deep-massage a swollen calf because a menu listed leg massage.

Foot bones: tarsals, metatarsals, fourteen phalanges

The foot is a load-bearing tripod, not a smaller hand. Learn the groups.

Tarsals are the ankle-and-rearfoot bones. There are seven. Two names matter on almost every technician exam and on every pedicure:

• The calcaneus is the heel bone, the largest tarsal, the bone you stand on, the bone under heel callus, and the bone under a fissured winter heel. Plantar fascia tissues attach near its bottom. The Achilles tendon attaches to its back. When you file the heel, you are working stratum corneum over this prominence, with a fat pad in between that may be thin.
• The talus sits on top of the calcaneus and meets the leg at the ankle joint. It is the tarsal that lets the foot hinge. When you dorsiflex the foot to see the toes, you are moving at the ankle around the talus.

Other tarsals (navicular, cuboid, three cuneiforms) build the midfoot and the medial arch. You palpate them as the bony midfoot. You do not need a surgical map. You do need to stop treating a bony midfoot bump as callus to erase.

Five metatarsals form the forefoot. Their heads are the ball of the foot, a classic callus zone, especially under the second and third heads and under a dropped first head. The first metatarsal leads to the great toe; a bunion deformity lives at that first metatarsophalangeal joint. The fifth head can carry a tailor's bunion. These are bony prominences. Callus over them is a pressure story. Aggressive reduction, especially with anything sharp, is how you create an ulcer-shaped injury on a client who may not feel it. Washington's razor-edged callus tool ban in WAC 308-20-110(16) is written in legal language; the anatomy underneath is metatarsal heads and a calcaneus that do not forgive a blade.

Fourteen phalanges in each foot match the hand's count: two in the hallux (great toe), three in each of the other four toes. Distal phalanges wear toenails. Hammer toes and claw toes change PIP and DIP angles so a flat clip or a straight nipper bite is the wrong geometry. Do not force a contracted toe straight to make your polish line prettier. Stabilize the phalanx you are filing; do not use the adjacent toe as a clamp that hyperextends an IP joint.

Do not confuse metacarpals (hand) with metatarsals (foot) on an item. One foot, NIC-style: 7 tarsals + 5 metatarsals + 14 phalanges.

The ankle joint and how you hold a pedicure

The ankle (talocrural) joint is where the tibia, fibula, and talus meet. The tibia is the large shin bone; its distal end is the medial malleolus (inner ankle knob). The fibula is the slender lateral bone; its distal end is the lateral malleolus (outer ankle knob). Those knobs are subcutaneous. Banging a basin edge into a malleolus is an injury. Hooking the client's foot over a poorly padded stool so the lateral malleolus takes the whole weight for forty minutes is an injury.

Dorsiflexion lifts the foot; plantarflexion points it. You need a little of both to see the free edge, the hyponychium, and the plantar surface. You do not need end-range. A fused ankle, an old fracture with hardware, a swollen ankle, or a client who says that pinch is my ankle, not the cuticle is telling you to change your hold. Support the leg, not just the toes. A technician who lifts by the digits is hanging fourteen phalanges from DIP joints.

Incorrect pedicure posture injures two skeletons. The client's ankle, knee, and hip get twisted if you swing the foot sideways to suit your preferred elbow. Your own lumbar spine and shoulders take a corkscrew if you sit parallel to a chair and reach across a shin. Square your trunk to the foot. Raise or lower the stool so the calcaneus is not in your lap and not at your clavicle. Chapter 6 said this as ergonomics; this chapter says it as joints.

The knee (femur, tibia, patella) and hip are not nail joints, but they decide whether the client can put a foot in a basin. Do not force a hip into external rotation because that is how we set the spa chair. Offer a basin position or a supported extension that stays inside the client's range. A placebound client receiving personal services under RCW 18.16.190 may have even less hip and knee range; bring the basin to the limb you can support, do not wrestle the limb to a standard shop pose.

Muscles you massage — groups, not a catalog

Gastrocnemius and soleus make the calf bulk and plantarflex the ankle (point the foot) through the Achilles to the calcaneus. They are the muscles a menu means by calf massage. Technician-level work is light to moderate effleurage toward the heart (up the leg), not a deep strip down into a painful Achilles insertion, not work on a red, hot, or cord-like calf. That picture can be medical — you do not diagnose a clot, you stop and refer.

Tibialis anterior runs beside the tibia and dorsiflexes the foot. You feel it when the client lifts the foot out of the water. Lateral compartment muscles help evert the foot. Intrinsic foot muscles — short flexors, the abductor of the great toe on the medial arch, interossei — maintain toe position. NIC items will still prefer flexor / extensor / abductor / adductor language: toe flexors curl digits; extensors lift them; abductors spread; adductors bring them toward the foot's midline. Use those actions when you ask a client to relax a clawed toe instead of pulling the phalanx yourself.

Plantar fascia is connective tissue, not a muscle. A painful medial heel may be a fascia story. Deep digging is not a manicurist's treatment. Gentle lotion over intact skin is a cosmetic finish, not therapy for heel pain. Soles still have no oil glands, so that lotion is also the 8.1 anatomy step after you have filed callus over the calcaneus.

Circulation, edema, and when the lower limb is a no

Lower-leg arteries that matter at the table: branches that become the dorsalis pedis pulse on the dorsum of the foot and the posterior tibial pulse behind the medial malleolus. You are not running a vascular clinic. You are learning that the foot has a pulse you should not occlude with a vice-like hold, and that a foot that is cold, blue-gray, or has punched-out sores is not a candidate for heat and aggressive callus work. Do not diagnose peripheral artery disease. Do recognize unsafe heat and massage.

Veins of the lower leg are the varicose-vein story. Varicosities are dilated, tortuous superficial veins. Vigorous massage over them is a contraindication in every respectable technician text. You can still perform a lawful pedicure on intact skin with a gentle touch. You do not knead a ropey calf.

Lymph from the foot and leg drains through popliteal nodes behind the knee toward inguinal nodes in the groin. Edema at the ankle — socks that leave deep rings, pitting when you press, a tight shiny instep — means skip vigorous massage. Do not wrap the limb in plastic and heat to draw out toxins. Do not claim lymph drainage as a Washington manicurist scope item. Swelling plus redness, heat, or pain is an infection-control and referral picture. WAC 308-20-110 already says no service on inflamed skin or open sores.

Diabetes belongs here the same way it belonged in 8.1, because the foot is where reduced sensation, thinner fat pads, and bony prominences stack. Numb plus hot soak plus a coarse file over a metatarsal head is a classic injury path. Check temperature on your own wrist, then confirm with the client. If they cannot feel it, do not add heat. Do not use banned blades. Do not cut live tissue. Dry between toes because sweat glands and web-space epidermis make a fungal neighborhood. Refuse broken skin.

Why aggressive callus work over bone is dangerous

Callus over the calcaneus and metatarsal heads is dead stratum corneum stacked on a prominence. After a soak, the stack is pale and soft. A coarse file or an e-file bit does not automatically stop at the dermal border. Over a bone there is less give. The client with neuropathy cannot tell you the moment you reach living tissue. Bleeding on a heel is a blood-spill event under WAC 308-20-110(17), a possible portal for infection, and on some medically complex feet a serious wound. Reduce bulk. Do not chase pink. Do not use a razor-edged callus shaver — illegal in Washington, anatomically reckless everywhere. Do not treat a fissure (a crack that may already reach dermis) as extra callus. Open skin is a stop.

Toenail work still happens on distal phalanges. Thick nails and pressure from shoes are not a reason to lever the DIP until the toe cracks. Cut with the toe's shape. Leave the hyponychium alone. The lateral nail grooves sit next to soft tissue that bleeds easily; the bone of the distal phalanx is immediately under the plate. An electric file used to thin a thick toenail still has to respect living skin at the grooves and the bone under the plate. Appliance safety from the WAC 308-20-080 curriculum is not a different subject; it is this skeleton plus a spinning bit.

Washington floor pictures

Spokane basin. The client's lateral malleolus is jammed against a hard spa shell. Pad it. Move the leg. The fibula's distal end is not a bumper.

Tacoma heel. A standing warehouse worker has yellow, thick calcaneal callus and numb feet. Gentle reduction, no extra-hot soak, no blade, thorough drying. Offer moisturizer because soles have no oil glands. Do not promise you fixed a medical condition.

Seattle edema. Ankles pit. The appointment book says deluxe massage. Skip the deluxe. Clean, shape, polish if skin is intact. Swelling is not a sales objection to overcome.

Yakima posture. The technician twists 45 degrees and cranks the client's ankle into inversion to reach the fifth toenail. Straighten your chair, support the tibia, and bring the little toe to you without end-range inversion.

Exam sentence: calcaneus and talus are the heel and ankle tarsals; five metatarsals and fourteen phalanges take the shoes and the polish; the ankle is tibia–fibula–talus; do not grind bone, crank joints, or vigorously massage edema, varicosities, or numb diabetic feet.