Zero drop shoes aren’t inherently bad, but they can cause real problems for people who switch to them too quickly or wear them without the foot and ankle strength to handle the different load pattern. The most common issues are Achilles tendon strain, metatarsal stress fractures, and calf pain, and runners who transition to minimalist footwear have two to three times the injury rate compared to those in traditional shoes, according to research published in the British Journal of Sports Medicine.
The “zero drop” label means there’s no height difference between the heel and the forefoot. Traditional running shoes typically have a 10 to 15 mm drop, meaning the heel sits higher. Removing that drop changes how forces travel through your legs, and that shift is where the trouble starts.
How Zero Drop Shoes Shift Stress to Your Ankles
The biggest biomechanical tradeoff with zero drop shoes is straightforward: they reduce stress on your knees but increase it on your ankles and calves. A 2025 study in Frontiers in Bioengineering and Biotechnology found that zero drop shoes significantly lowered peak kneecap joint stress compared to shoes with a 15 mm drop. That sounds like a win, and for people with chronic knee problems it can be. But the force doesn’t disappear. It moves downward.
Research on heel height and ankle mechanics shows that running in shoes with no heel produces roughly 10.6% more ankle torque than running barefoot, and over 25% more frontal plane torque than running in shoes with a 26 mm heel. Frontal plane torque is the rotational force that rolls your ankle side to side. More of it means your ankle stabilizer muscles, Achilles tendon, and calf complex absorb significantly more work with every stride. For someone running 20 or 30 miles a week, that’s thousands of additional high-stress repetitions on tissues that may not be conditioned for it.
Common Injuries From Zero Drop Shoes
The injury patterns podiatrists see in zero drop shoe wearers cluster around the foot and lower leg. The most frequently reported problems include:
- Metatarsal stress fractures: Zero drop shoes encourage a more forward foot strike, which loads the long bones of the forefoot more heavily. Without gradual adaptation, these bones can develop hairline fractures.
- Achilles tendinitis: A lower heel position stretches the Achilles tendon further with each step. The tendon adapts slowly because of limited blood supply, so overloading it causes inflammation and microtears.
- Plantar fasciitis: Less arch support means the thick band of tissue along the bottom of your foot works harder to maintain your arch during push-off.
- Calf strains and shin splints: Your calf muscles act as the primary shock absorbers when there’s no cushioned heel to do the job.
- Ankle sprains: Less structure around the foot means less passive stability, especially on uneven surfaces.
People who overpronate, meaning their feet roll inward excessively, are at particular risk. Traditional shoes with a heel drop and medial post help control that inward roll mechanically. Remove those features and the muscles and tendons have to do all the stabilizing work themselves. If they’re not strong enough, the repeated overpronation can cascade into bunions, tendinitis, and stress fractures.
The Transition Problem
Most zero drop shoe injuries aren’t caused by the shoe design itself. They’re caused by doing too much, too fast. Your body has spent years (likely decades) adapting to shoes with a raised heel. Your Achilles tendon, calf muscles, and foot intrinsic muscles have all developed around that specific loading pattern. Switching overnight is like asking someone who bench presses 100 pounds to suddenly lift 130. The tissues aren’t ready.
Experienced runners who’ve made the switch successfully report that a full transition takes far longer than most people expect. A reasonable approach involves cutting weekly mileage dramatically at first, sometimes down to just a few miles per week, then building back gradually over several months. Three months of progressive loading is generally enough for tendons to begin adapting to a new activity pattern, which is why many training programs follow a 12-week structure. But reaching the point where you can handle your previous mileage entirely in zero drop shoes often takes one to two years of patient progression.
The critical principle is progressive overload: small, measured increases in distance and intensity, with rest days that let tissues rebuild. Jumping from a traditional shoe with a 12 mm drop to a zero drop shoe and running your normal routes is the single most common mistake, and it’s the one most likely to land you in a podiatrist’s office.
Who Should Avoid Them
Zero drop shoes are a poor fit for certain foot types and conditions. If you have flat feet or significant overpronation, the lack of built-in support means your foot mechanics go largely unchecked. People with a history of Achilles tendon problems are loading the exact structure that’s already vulnerable. Those with existing plantar fasciitis often find that zero drop shoes make it worse, since the fascia gets stretched further without heel elevation to take some slack off it.
Heavier runners face additional risk because impact forces scale with body weight. The forefoot and ankle structures absorbing those forces in zero drop shoes are relatively small, and they reach their tolerance threshold faster under greater loads.
People who spend most of their day in conventional shoes with raised heels (including dress shoes and boots, not just running shoes) have the most ground to make up in terms of tissue adaptation. Their calves and Achilles tendons have literally shortened over time to match the heel-elevated position. Asking those shortened structures to suddenly work through a full range of motion under running loads is a recipe for injury.
When Zero Drop Shoes Work Well
None of this means zero drop shoes are universally bad. They reduce kneecap joint stress, which matters for runners dealing with anterior knee pain. They encourage a more natural foot strike pattern that can improve proprioception, the ability to sense the ground beneath you. Over time, they strengthen the small muscles inside the foot that traditional shoes let atrophy.
The people who do well with zero drop shoes tend to share a few traits: they transitioned slowly, they had no pre-existing foot or ankle conditions that conflicted with the design, and they supplemented with calf and foot strengthening exercises during the transition. Many also rotate between zero drop and traditional shoes rather than going all-in, which lets them get the strengthening benefits without overwhelming any single tissue.
The shoes themselves aren’t the villain. The problem is treating a fundamentally different biomechanical tool as a simple swap, when it’s really a training change that demands the same patience and progression you’d give any new physical challenge.