Strengthening the posterior tibial tendon requires a progressive approach, starting with gentle activation exercises and building toward loaded single-leg work over several months. This tendon is the primary support structure for your foot’s arch, and when it weakens, the arch gradually collapses. The good news: conservative strengthening programs have an 83% success rate for early-stage dysfunction, often making surgery unnecessary.
What the Posterior Tibial Tendon Does
The posterior tibial tendon runs from a muscle deep in your calf, behind the inner ankle bone, and attaches to several bones on the underside of your midfoot. When it contracts, it pulls your foot inward and downward while lifting the arch. This locking action makes the middle and back of your foot rigid enough to push off the ground when you walk or run.
Without a functioning posterior tibial tendon, the ligaments and joint capsules that passively support your arch gradually stretch out, leading to flatfoot. That’s why strengthening this tendon matters even if you only have mild symptoms. A quick self-test: stand on one leg and try to rise onto your toes. If you can do it without pain, your tendon is likely in early stages of weakening. If it hurts or you can’t complete the motion, the dysfunction has progressed further and you’ll need to start at a more basic level.
Stage 1: Tendon Activation
Before loading the tendon with resistance, you need to wake it up. The best starting exercise is the sole-to-sole press. Sit in a butterfly position with the soles of your feet together (or sit in a chair if that’s more comfortable). Press the balls of your feet into each other and gently pull your toes toward the ceiling. You should feel the tendon activate along the inside of your ankle. Relax and repeat. Start with 100 repetitions per session and gradually work up to 300. Do this 5 to 7 days per week.
This exercise looks deceptively simple, but it isolates the posterior tibialis without putting your body weight through the tendon. It’s appropriate even if your tendon is currently irritated or if you’ve been in a walking boot. If you’ve recently come out of a period of immobilization (typically 3 to 4 weeks for acute flare-ups), this is where your rehab begins.
Stage 2: Resisted Inversion
Once the activation work feels easy and pain-free, add resistance. Sit down and loop a resistance band around the inside of your foot, tying the other end to a stable object like a chair leg. Point your foot down and then turn it inward against the band’s resistance. Slowly return to the starting position. Aim for 3 sets of 15 repetitions.
The key detail here is the starting position: point your foot slightly downward before inverting. This puts the posterior tibialis in its strongest mechanical position and prevents other muscles from taking over the movement. Keep the motion controlled in both directions. The slow return to neutral is where much of the tendon-strengthening stimulus happens.
Stage 3: Bilateral Heel Raises
Heel raises are the core progression for posterior tibial tendon strengthening, but you need to do them correctly. Start by rising onto the balls of both feet, then lowering on both feet. Hold onto a wall or counter for balance. Keep your knees fully straight and your feet parallel with heels together. That heel-together position prevents your foot from rolling outward, which would shift the work away from the posterior tibialis.
Work up to 50 repetitions in a single session, performed 5 to 7 days per week. This stage typically takes several weeks to master. If you can complete 50 reps without pain or fatigue in the inner ankle, you’re ready to progress.
Stage 4: Single-Leg Eccentric Lowering
This is the most important phase for building real tendon strength. Rise onto the balls of both feet, then lift your uninvolved leg off the ground and slowly lower down on the affected foot only. Keep your weight over the ball of your foot as you lower, avoiding the temptation to roll outward. Place both feet back on the floor and repeat. Work up to 50 repetitions, 5 to 7 times per week.
The eccentric portion (the controlled lowering) is where tendons remodel and get stronger. This is the same principle used in Achilles tendon rehabilitation, and it applies equally to the posterior tibialis. The two-up, one-down approach lets you load the tendon during the lowering phase without asking it to handle your full body weight on the way up, which would be too much too soon.
Supporting Exercises for the Foot and Ankle
The posterior tibialis doesn’t work alone. The small intrinsic muscles inside your foot also help maintain arch height, and strengthening them takes pressure off the tendon. Three exercises target these muscles effectively:
- Towel scrunches: Place a towel flat on the floor and use your toes to scrunch it toward you. This activates the muscles on the underside of your foot.
- Toe yoga: Lift your big toe while keeping the smaller toes on the ground, then reverse. This builds independent control of the muscles that stabilize your arch.
- Short foot (foot doming): While sitting or standing, try to shorten your foot by drawing the ball of your foot toward your heel without curling your toes. The arch should visibly rise. Hold for a few seconds and release.
As you get stronger, add single-leg balance work, squats, lunges, and step-ups to train the posterior tibialis in functional movement patterns. The tendon needs to handle real-world forces, not just isolated band exercises.
How Long Recovery Takes
Expect the full progression from activation to single-leg eccentric work to take roughly 12 to 18 weeks. The early stages move faster. You might spend 1 to 2 weeks on activation, another 2 to 3 weeks on banded inversion, and then several weeks each on bilateral and single-leg heel raises. Tendon tissue remodels slowly compared to muscle, so patience matters more than intensity.
By weeks 8 to 12, most people can walk with a normal gait pattern and handle basic single-leg exercises. By weeks 12 to 18, you should be able to do single-leg calf raises, lateral movements, and light agility work. Rushing this timeline increases the risk of re-irritating the tendon and starting over.
The Role of Orthotics During Strengthening
Arch-supporting insoles or custom orthotics are commonly used alongside strengthening programs for posterior tibial tendon dysfunction. Research suggests that combining orthotics with exercise produces better results than either approach alone. The orthotic reduces strain on the tendon during daily activities, giving it a better environment to heal, while the exercises rebuild the tendon’s capacity to handle load.
For your dedicated strengthening sessions, you’ll generally perform the exercises without shoes or orthotics so the muscles and tendon do the work themselves. During the rest of your day, especially walking or standing for long periods, supportive footwear or orthotics help manage the load on a tendon that’s still recovering.
Managing Pain During the Program
Some mild discomfort during exercises is normal, particularly when you first increase the difficulty. A useful guideline: if pain during an exercise stays below a 3 or 4 out of 10, and settles back to your baseline within 24 hours, the load is appropriate. If pain spikes above that level during the exercise, or if your ankle feels worse the next morning than it did the day before, scale back to the previous stage for another week or two.
Swelling along the inner ankle after exercise is a sign you’ve done too much. Ice for 15 to 20 minutes after sessions can help manage inflammation in the early weeks, but the real solution is adjusting volume and intensity. The goal is to challenge the tendon just enough to stimulate adaptation without overwhelming its current capacity.