A transmetatarsal amputation (TMA) is a surgical procedure that removes the front portion of the foot by cutting through the five metatarsal bones, the long bones that connect the midfoot to the toes. The result is a shortened but still functional foot that can bear weight without a full leg prosthesis. It’s one of the most common partial foot amputations, typically performed to save as much of the limb as possible when the toes or forefoot are too damaged to survive.
Where the Foot Is Cut
The metatarsal bones fan out from the midfoot toward each toe. In a TMA, surgeons divide all five of these bones, removing everything forward of the cut: the ball of the foot and all five toes. The exact level of the cut can range from near the metatarsal heads (the knobby ends closest to the toes) all the way back to where the metatarsals meet the midfoot bones.
The cuts aren’t made in a straight line across all five bones. The second metatarsal is typically cut first and serves as the reference point. The first metatarsal (on the big toe side) is trimmed to match. The third, fourth, and fifth metatarsals are each cut progressively shorter, creating a slight slope from the inside to the outside of the foot. Each bone is also angled to remove slightly more bone from the bottom surface than the top, which helps create a smoother, more comfortable surface for walking. This careful shaping reduces the chance of a bony point pressing into the skin and causing a wound later.
Why It’s Performed
The most common reason for a TMA is tissue death (gangrene) in the toes or forefoot, usually caused by poor blood flow. This is especially prevalent in people with diabetes, where a combination of reduced circulation and nerve damage can allow small wounds to progress into serious infections. TMA has been used for this purpose since the 1940s, when early studies showed good outcomes in patients with diabetic foot gangrene.
Other reasons include severe trauma to the forefoot, frostbite, or infections that don’t respond to more conservative treatment. The goal is always the same: remove enough tissue to eliminate the dead or infected area while preserving as much healthy foot as possible. Keeping the ankle joint and heel intact makes a dramatic difference in a person’s ability to walk independently compared to a below-knee amputation.
How the Wound Is Closed
One of the most important parts of the surgery is creating a durable covering for the end of the shortened foot. Surgeons use a long flap of thick skin from the sole of the foot, called the plantar flap, and fold it forward over the exposed bone ends. The skin on the bottom of your foot is uniquely tough and padded with fat, making it far better suited to handle the pressure of walking than skin from the top of the foot. Preserving the integrity of this plantar flap is considered essential to a successful outcome.
When the plantar skin is too damaged or too short to cover the wound, surgeons sometimes use rotational flaps, borrowing healthy tissue from a nearby area to close the gap. This is a backup option, though. The classic long plantar flap remains the preferred technique because it puts the most durable tissue directly under the weight-bearing surface.
Healing Rates and Risks
Not every TMA heals without complications. Published healing rates range from 44% to 88%, depending on the patient population studied. In one retrospective review, about 71% of patients achieved primary healing at a median of 31 days, though some wounds took significantly longer. The remaining 29% did not fully heal after the initial surgery.
The most serious risk is that the TMA fails entirely and a higher-level amputation becomes necessary. In a series of 247 patients, 26% eventually required a below-knee or above-knee amputation. Factors that raise this risk include severely compromised blood flow, uncontrolled diabetes, active infection at the time of surgery, and poor nutrition. Surgeons often assess blood flow to the foot carefully before proceeding with a TMA, because adequate circulation is critical for the wound to heal.
How Walking Changes After a TMA
Losing the front of the foot has a significant impact on how you walk. The metatarsal heads and toes play a central role in the push-off phase of each step, the moment when your foot pushes against the ground to propel you forward. Without them, the ankle generates far less power during walking. Studies measuring this directly found that ankle power generation during push-off dropped to roughly 28% of normal levels, improving only slightly (to about 31%) with a prosthetic device. Ankle moments in the final phase of each step were about 45% of normal when walking barefoot.
To compensate, people with a TMA rely more heavily on their hip muscles to pull the body forward. Both hips increase their power output to make up for what the ankle can no longer provide. The center of pressure under the foot also behaves differently. Normally, pressure rolls smoothly from heel to toe during a step. After a TMA, that forward roll stops short of the end of the residual foot, which limits the leverage available for push-off. The net effect is a slower walking speed and a gait that requires more energy than before. These changes are consistent regardless of exactly where along the metatarsals the bones were cut.
Prosthetic and Orthotic Options
After a TMA, you won’t need a traditional prosthetic leg, but you will need devices that fit inside or around your shoe to restore foot length, improve stability, and protect the residual foot from pressure injuries. The options range from simple to complex, depending on how much foot was removed and how active you are.
- Insoles and toe fillers: These fill the empty space in the front of your shoe. They work well for less proximal amputations but are generally insufficient on their own after a TMA.
- Ankle-foot orthoses (AFOs): These braces extend from below the knee down to the foot, limiting ankle motion and providing a stiffer platform for push-off. They are one of the more common solutions for TMA patients.
- Clamshell sockets: These wrap around both the lower leg and the remaining foot, distributing pressure more broadly and offering greater stability. They’re typically recommended for people with more proximal cuts or those who need more support for daily activity.
The choice between these devices depends on the length of the residual foot, skin condition, activity level, and personal comfort. Most people go through a fitting process with a prosthetist or orthotist to find the combination that works best. A well-fitted device makes a meaningful difference in walking speed, balance, and the ability to wear standard footwear.
What Recovery Looks Like
Immediately after surgery, the foot is bandaged and kept elevated to reduce swelling. Weight-bearing is restricted for several weeks to give the wound time to heal, and most patients use a wheelchair or crutches during this period. The timeline varies widely. While the median healing time in studies is around 31 days, some wounds take months to fully close, particularly in patients with diabetes or circulation problems.
Once the wound is healed, rehabilitation focuses on regaining balance and learning to walk with the altered foot. Physical therapy typically addresses the new gait pattern, strengthening the hip muscles that now do more of the work, and gradually increasing walking distance. Getting fitted for the right orthotic device is a key part of this process, as it directly affects comfort and confidence during walking. Most people are able to return to independent daily activities, though high-impact exercise and prolonged standing may remain more challenging than before.