Plantar fasciitis has a talent for making you feel personally betrayed by your own foot. That first step out of bed, and suddenly your heel is filing a formal complaint. Naturally, most people respond by interrogating the foot with new shoes, ice, a golf ball rolled under the arch. Reasonable moves. But sometimes the actual suspect is filed several joints north, up at the hip.
The foot doesn't work alone
Plantar fasciitis is inflammation and micro-strain of the plantar fascia, the thick band of tissue running along the bottom of your foot. But your foot doesn't operate as an isolated unit, it's the last stop in a long biomechanical chain that starts at your core and hip and works its way down through the knee and ankle before your heel ever hits the ground.
Research published in the International Journal of Medical Sciences found weak hip abductor muscles were associated with altered foot posture. Both flatter, pronated arches and higher, supinated ones, and proposed that the hip muscles play a meaningful role in how load gets distributed through the ankle and foot. A related case study in the Journal of Chiropractic Medicine combined hip strengthening with manipulative therapy specifically for plantar fasciitis treatment, based on that same biomechanical logic: fix the load transfer higher up, and the foot has less work to do compensating.
Weak glutes, unhappy heel
One of the more interesting findings in this space comes from a case study published in the journal Medicine: patients with plantar fasciitis often show reduced hip abductor strength, and a hip-strengthening exercise program was directly used as a treatment approach with positive results. The proposed mechanism isn't mystical, when your hip abductors and glutes are weak your leg tends to drift into more internal rotation and your arch collapses inward (overpronates) during walking, which increases strain on the plantar fascia with every step. A separate review specifically examining core muscle strength found that transient core weakness may itself function as a risk factor for developing plantar fasciitis in the first place, through its downstream effects on hip and knee movement patterns.
It's a chain reaction, not a single link
A gait-analysis study published in Archives of Physiotherapy looked at people with plantar fasciitis and found that limited ankle flexibility triggers a chain of compensations: shorter stride length, early heel lift, and altered movement at more proximal joints (translation: the hip and knee start picking up slack that the ankle can't provide). The body is remarkably good at finding a workaround for a stiff or painful joint; the problem is that the workaround often shows up as strain somewhere else in the chain.
So what do you actually do with this information?
None of this means your shoes are innocent, or that direct foot-focused treatment doesn't matter. Stretching the plantar fascia and calf and supportive footwear remain legitimate first-line approaches. If plantar fasciitis keeps returning despite doing "everything right" at the foot level, the research suggests it's worth having your hip strength and overall gait mechanics evaluated too. Sometimes the squeaky wheel isn't the one with the actual problem, it's just the one bearing the consequences of a problem happening upstream.
Sources
"Core Muscle Weakness May Be a Risk Factor for the Development of Plantar Fasciitis." PMC, PMC12631504.
"The effects of hip strengthening exercises in a patient with plantar fasciitis: A case report." Medicine (Baltimore), 2019;98(26):e16258.
Santos BD, Corrêa LA, Teixeira Santos L, et al. "Combination of hip strengthening and manipulative therapy for the treatment of plantar fasciitis: a case report." Journal of Chiropractic Medicine, 2016;15:310-313.
Lee S-P, Powers CM. "Individuals with diminished hip abductor muscle strength exhibit altered ankle biomechanics and neuromuscular activation during unipedal balance tasks." Gait & Posture, 2014;39:933-8.
"The relationship between clinical outcomes and gait biomechanics in individuals with plantar fasciitis." Archives of Physiotherapy, PMC12907804.