The Scope of the Problem: Why Women, and How Many

Patellofemoral pain syndrome (PFPS) — the clinical term for the aching, grinding, or burning pain around the front of the knee — is one of the most common musculoskeletal complaints in the active population. But it is not evenly distributed. Women bear a disproportionate burden.

In a landmark epidemiological study drawing on over 2.1 million patellofemoral pain diagnoses across the United States, females accounted for 55% of all PFPS cases and 60% of chondromalacia patella diagnoses — the most direct form of cartilage-related patellofemoral pathology. This disparity was statistically significant (p < 0.001) across almost every age group, and was most pronounced in the 10–19 age bracket, where girls made up over 66% of cases. (Glaviano et al., 2015 — Int J Sports Phys Ther)

This is not a minor skew. It is a 2:3 ratio that demands explanation — and that explanation has profound implications for how we train, treat, and advise women with knee pain.

The Broader Knee Health Picture

PFPS is the acute, exercise-related end of the spectrum. Further along the continuum sits osteoarthritis (OA), the degenerative joint condition that is now Canada’s most prevalent chronic musculoskeletal disease:

Source: Public Health Agency of Canada, 2020

The knee is the most commonly affected joint in OA, and the pattern mirrors PFPS: women are more affected, at earlier ages, with greater functional impact. In British Columbia specifically, OA affects approximately 433,000 residents, and the knee accounts for the majority of cases requiring hip or knee replacement. (BC OA Survey, UBC Arthritis Research)

PFPS in your 30s and 40s is not inevitable. It is also not a life sentence. But the window to correct the underlying biomechanics is now — not after a decade of guarding, compensating, and deconditioning.

Why Are Women More Affected?

The sex disparity in PFPS is not random. Several anatomical and neuromuscular factors converge in ways that are more pronounced in women:

• Q angle: Women typically have a wider pelvis relative to femur length, creating a larger quadriceps angle (Q angle). This geometry places the kneecap under greater lateral stress and increases the tendency for patellar malalignment.
• Gluteus maximus inhibition during landing: Research indicates women demonstrate less gluteus maximus activation than men during landing tasks — a neuromuscular pattern that reduces the hip’s ability to control inward knee collapse. (Silvers-Granelli, 2021 — Int J Sports Phys Ther)
• Ligament laxity: Oestrogen influences ligament compliance, affecting joint stability across the hormonal cycle.
• ACL injury rates: Women have 3–8 times the ACL injury rate of similarly trained male athletes, and the same dynamic knee valgus pattern that drives PFPS also drives ACL tears. This is the same biomechanical problem on a severity spectrum. (Silvers-Granelli, 2021)

All of these factors are influenced by training. The gluteus maximus inhibition pattern is modifiable. The Q angle is fixed — but its consequence (dynamic knee valgus) is absolutely correctable through hip strengthening.

The Real Cause — It Is Not Your Knee

Here is the biomechanics, explained plainly:

Your kneecap (patella) sits in a groove on the end of your femur called the trochlear groove. It is designed to glide straight up and down as you bend and extend your knee. When it glides correctly, pressure distributes evenly across the joint. When it tracks laterally — pulled off-centre by tight outer tissues or inward femoral rotation — the pressure concentrates on one area of cartilage. That is patellofemoral pain.

The question is: what pulls the patella off track? In most women with PFPS, the answer runs through the hip, not the knee itself.

The Gluteus Medius Inhibition Chain

The gluteus medius is the primary hip abductor — the muscle on the outer hip that keeps your pelvis level and prevents your knee from collapsing inward when you stand on one leg (which you do with every step you take). When the gluteus medius is inhibited, weak, or failing to fire at the right moment, a predictable cascade follows:

1. Gluteus medius inhibition → the hip cannot control frontal-plane forces
2. Femoral adduction and internal rotation → the thigh rotates inward under load
3. Dynamic knee valgus → the knee collapses medially relative to the hip and foot
4. Patellar maltracking → the kneecap is pulled laterally relative to the trochlear groove
5. Patellofemoral pain → uneven cartilage loading, inflammation, anterior knee ache

This chain is well established in the literature. A 2025 study by Ho, Kissman, and colleagues published in Frontiers in Physiology found that gluteus medius central activation ratio (CAR) correlated significantly with Anterior Knee Pain Scale (AKPS) function scores in people with PFP (r = 0.584, p = 0.038) — meaning the more a person’s gluteus medius was actually firing, the better their knee function. Wide variability in gluteus medius activation (ranging from 84.4% to 98.3%) in PFP patients suggests a subgroup with meaningful inhibition whose symptoms would respond well to targeted re-activation work. (Ho et al., 2025 — Front Physiol)

The Gluteus Maximus Factor: ACL Risk and Knee Valgus

While the gluteus medius controls frontal-plane hip stability, the gluteus maximus controls hip extension and external rotation — and its inhibition has its own damaging consequences. Women demonstrate less gluteus maximus activation during landing tasks than men, contributing to the greater degree of dynamic knee valgus that predisposes female athletes to ACL injuries at 3–8 times the male rate. (Silvers-Granelli, 2021)

Research from the Journal of Experimental Orthopaedics confirms that gluteal muscle strength deficits directly influence dynamic knee valgus, and that solid glute strength is associated with substantially fewer knee valgus episodes during demanding tasks like jump landings — the same tasks that put the ACL under the greatest stress. (Losciale et al., 2022 — J Exp Orthop)

The bottom line: your glutes protect both your kneecap (PFPS) and your ACL (tear risk). Strengthening them is not optional — it is the cornerstone of knee health for women.

Hip Abduction Strength and Knee Valgus: What the Research Shows

A comprehensive scoping review of 29 studies examined the relationship between hip abduction strength and dynamic knee valgus. The consistent finding: stronger hip abductors produce measurably less knee valgus during squatting, landing, and walking — directly reducing patellofemoral joint stress. This is the mechanism by which hip strengthening resolves knee pain without ever touching the knee directly.

This is not a fringe finding. It is the basis of the current clinical practice guidelines for PFPS from the Journal of Orthopaedic and Sports Physical Therapy (Witvrouw et al., 2019 — JOSPT), which recommend hip strengthening as a core component of evidence-based PFPS management.

The Desk Worker Factor

If you work at a computer for most of the day — whether in a downtown Vancouver office tower or at a home desk in Point Grey — your working environment is actively working against your knees.

Here is why:

The Sitting–Glute Inhibition Loop

Prolonged sitting places the hip in a position of sustained flexion. When the hip flexors are held in a shortened position for hours, reciprocal inhibition reduces the neural drive to the opposing gluteal muscles. This is not a theory — it is a well-documented neuromuscular phenomenon. The result: a typical desk worker’s glutes are less neurologically “available” for immediate activation when they stand and begin moving.

This contributes directly to the gluteus medius inhibition chain described above. You get up from your chair, the glutes are slow to fire, the knee valgus pattern appears, and the patellofemoral joint takes the load it was not designed to bear.

Anterior Pelvic Tilt and the Knee Pain Connection

Prolonged sitting also encourages anterior pelvic tilt (APT) — the forward tilting of the pelvis that creates an exaggerated lumbar curve and places the hip and knee in suboptimal alignment for weight-bearing activity. This is not merely a postural cosmetic issue. A published study specifically examining the relationship between APT and PFPS found a statistically significant moderate positive correlation between anterior pelvic tilt angle and pain intensity in PFPS patients (r = 0.409, p = 0.009). In plain terms: the greater the forward tilt of the pelvis, the more intense the knee pain. (Al-Qattan et al. — J Biomed Arthritis Rehabil)

The Sitting Hours Data

Research on occupational sitting and knee pain has produced consistent findings:

• Office workers with knee pain sit an average of 6.72 hours per day — substantially above the threshold at which musculoskeletal risk increases
• Prolonged sitting has been shown to produce MSD symptoms in the thighs and knees of office workers, alongside more commonly discussed areas like the lower back and shoulders (Daneshmandi et al., 2017 — J Lifestyle Med)
• Approximately 3.9 million Canadians live with diagnosed osteoarthritis, the majority knee-related, and women are affected at 16.1% versus 11.1% for men — a gap that widens with age (Public Health Agency of Canada, 2020)

For TurnFit’s corporate wellness clients, this data is directly actionable. Desk workers are not suffering from bad luck; they are suffering from a preventable biomechanical environment that responds well to structured intervention. A corporate wellness programme that addresses hip mobility, glute activation, and movement patterning can meaningfully reduce workplace knee pain — and the productivity, absenteeism, and long-term health costs that come with it.

The Foot Foundation: The Kinetic Chain from the Ground Up

The gluteus medius gets much of the attention in PFPS research, and rightly so. But for some women, the chain of dysfunction does not begin at the hip — it begins at the foot.

Your foot is the first point of contact with the ground, and the forces it absorbs and transmits travel directly upward through the ankle, tibia, knee, and hip. When the foot over-pronates — the arch collapses and the heel rolls inward — the mechanical consequences ripple upward:

1. Subtalar pronation → the heel bone rolls inward
2. Tibial internal rotation → the shin bone rotates medially, coupled to subtalar motion
3. Medial pull on the patellar tendon → disrupts kneecap tracking in the trochlear groove
4. Patellofemoral malalignment → asymmetric joint loading and pain

This cascade has been studied extensively. Research by Barton and colleagues (2011) found that individuals with PFPS demonstrate earlier peak rearfoot eversion during gait compared to pain-free controls (p = 0.01), suggesting that more rapid foot pronation at heel strike is a measurable feature of patellofemoral pain patients — particularly women, who made up 81% of the PFPS group in that study. (Barton et al., 2011 — J Foot Ankle Res)

Studies examining foot posture and functional outcomes in PFPS consistently find that patients with greater foot over-pronation score significantly worse on the Kujala Anterior Knee Pain Scale — the gold-standard clinical measure of patellofemoral function — compared to those with neutral or supinated foot posture. The JOSPT 2019 Clinical Practice Guidelines now recommend foot orthoses for PFPS patients with greater-than-normal pronation, specifically combined with exercise therapy. (Witvrouw et al., 2019 — JOSPT)

Why Treating Foot Pronation Alone Is Not Enough

An orthotic addresses the foot end of the chain but does not strengthen the hip end. Similarly, hip strengthening alone may not fully eliminate a pronation-driven component. This is why TurnFit’s assessment evaluates the entire chain — foot mechanics, ankle mobility, tibial rotation, and hip strength — rather than focusing on a single joint. The right intervention targets the specific links in your chain that are failing.

For some clients, the primary driver is hip weakness; for others, it is foot mechanics; for many, it is both. A programme that does not assess all three levels will miss part of the problem.

What the Science Says About Fixing It

The research on hip strengthening for patellofemoral pain is extensive, consistent, and frankly, unusually decisive for musculoskeletal rehabilitation. Here is the evidence that matters most:

Ferber et al. (2015): The Multicenter RCT That Changed the Conversation

In the most rigorous trial to date on this question, Reed Ferber and colleagues at the University of Calgary led a multicenter randomised controlled trial with 199 participants (66% women, mean age 29) comparing a hip-and-core strengthening protocol (HIP group) to isolated knee strengthening (KNEE group) over 6 weeks. The results were clear:

• Both groups showed significant reductions in VAS pain scores and improvements in Anterior Knee Pain Scale function (p < 0.001 in both)
• The HIP group achieved pain resolution one week earlier than the KNEE group
• The HIP group showed significantly greater gains in hip abductor strength (p = 0.01) and posterior core endurance (p = 0.05)
• Baseline VAS scores in the hip group averaged 5.2/10; at 6 weeks, women in the hip group reduced to approximately 2.4/10 — a 54.7% reduction

(Ferber et al., 2015 — J Athl Train. PMID: 25365133)

Halabi et al. (2025): Meta-Analysis Confirms Hip + Knee Superiority

A 2025 systematic review and meta-analysis published in Musculoskeletal Care synthesised six RCTs involving 241 PFPS patients (96.3% female). The conclusion: combined hip and knee strengthening significantly outperforms knee strengthening alone for both pain reduction (SMD = -1.29, 95% CI [-1.98, -0.59], p = 0.0003) and functional activity (SMD = 0.99, 95% CI [0.22, 1.76], p = 0.01). These are large effect sizes, and the patient population was overwhelmingly female — making these findings directly applicable to the women reading this. (Halabi et al., 2025 — Musculoskelet Care. PMID: 39934098)

Supporting Evidence: Multiple RCTs and Systematic Reviews

What This Means in Practice

Six weeks of consistent, targeted hip strengthening — the kind that addresses your specific weak links in the kinetic chain — produces measurable, clinically significant improvements in knee pain. Not in a year. In six weeks. The evidence base for this is robust, replicated across multiple independent research groups, and consistently points to the hip as the key therapeutic target.

Why Most Approaches Fail

If the evidence is this clear, why do so many women with PFPS remain in pain for months or years? The answer lies in how knee pain is typically managed — and what most approaches get wrong.

“Rest It” Does Not Fix the Root Cause

Rest reduces inflammation and offloads the joint, which can temporarily ease symptoms. But rest does not address gluteus medius inhibition. It does not correct anterior pelvic tilt. It does not change the way you land, climb stairs, or squat. When you return to activity after a rest period, you return with the same biomechanical fault — and often with weaker hip and quad muscles than when you started, because they have not been used.

PFPS has a well-documented tendency toward chronicity when under-treated. Research tracking PFPS patients over 5–20 years found that 25–91% continued to report symptoms affecting daily life or physical activity — a range that largely reflects the quality of the rehabilitation undertaken. (Ferber et al., 2018 — J Athl Train)

Isolated Quad Strengthening Misses the Hip

The traditional prescription for PFPS — quad sets, straight-leg raises, terminal knee extensions — addresses only one side of the equation. These exercises can reduce pain and improve function, but the evidence now clearly shows that adding hip work produces superior and faster results. Treating the knee without the hip is like trying to fix a door hinge by only working on the door itself — when the frame is the problem.

Ice and Anti-Inflammatories Address the Signal, Not the Source

NSAIDs and icing manage the inflammatory response that PFPS produces, but they do not change the mechanical fault producing that response. They are appropriate short-term measures — but they are not a rehabilitation plan.

Generic Exercise Classes May Load the Knee Incorrectly

Group fitness classes and generic online workouts are not designed for your kinetic chain. If your gluteus medius is inhibited and you are performing high-volume squats, lunges, or step-ups without correction, you may be loading a dysfunctional pattern under progressive load — reinforcing the very mechanics causing your pain. This is why individualised assessment matters. The goal is not to avoid loading the knee; it is to load it correctly.

The TurnFit Approach: Assessment to Fix

TurnFit Personal Trainers has worked with hundreds of women in Vancouver experiencing exactly the knee pain described in this post. David Turnbull and the TurnFit team hold BCRPA certification, have earned 300+ five-star Google reviews, and have been awarded the Top Choice Award in Vancouver eight times — a track record built on producing real, lasting results.

The TurnFit approach to knee pain does not begin at the knee. It begins with a comprehensive movement assessment that maps your individual kinetic chain, then builds a programme targeting your specific weak points.

Step 1: Foot and Ankle Assessment

The assessment begins at the floor. TurnFit evaluates arch posture, subtalar pronation, and ankle dorsiflexion. Limited ankle dorsiflexion is a documented contributor to patellofemoral stress — when the ankle cannot dorsiflex adequately, the knee compensates by moving into greater flexion and valgus to accommodate movement. Foot over-pronation is assessed and, where clinically indicated, orthotic referral or specific foot intrinsic strengthening is incorporated into the programme.

Step 2: Pelvic Position and Hip Flexor Length

The assessment evaluates pelvic tilt and hip flexor length. Given the moderate positive correlation between anterior pelvic tilt and PFPS pain intensity (r = 0.409, p = 0.009), correcting APT through hip flexor lengthening and posterior chain strengthening directly addresses pain intensity — not just function. For desk workers, this step is almost always relevant.

Step 3: Gluteus Medius and Maximus Strength Testing

Hip abductor and extensor strength are assessed both quantitatively (manual muscle testing) and functionally (single-leg squat quality). This identifies the specific gluteal muscles requiring targeted work and establishes a baseline against which progress will be tracked.

Step 4: Dynamic Movement Screen

TurnFit observes you moving — squatting, stepping, landing, walking up and down stairs. This is where the biomechanical fault becomes visible: the knee caving inward, the trunk leaning, the pelvis dropping. These real-time observations confirm the assessment findings and identify the precise movement patterns to correct.

Step 5: Personalised Hip-Dominant Programme

From the assessment, TurnFit builds a progressive, individualised programme. The programme typically includes:

• Gluteus medius activation: Lateral band walks, clamshells, standing hip abduction — building the baseline activation that has likely been absent for years
• Gluteus maximus loading: Hip thrusts, single-leg deadlifts, Bulgarian split squats — building the posterior chain strength that controls knee valgus under load
• Hip flexor lengthening: 90/90 stretches, couch stretch, half-kneeling mobilisation — correcting the pelvic position driving APT and glute inhibition
• Graduated knee loading: Controlled squatting with progressive range, step-ups, wall sits — reloading the patellofemoral joint within a pain-free range, progressively expanding that range as hip strength and control improve
• Foot and ankle work: Calf raises, single-leg balance, foot intrinsic exercises — addressing the ground-up component where relevant
• Movement pattern re-education: Retraining squat, lunge, and step mechanics so the knee consistently tracks over the second toe, not caving inward

In-Person at Kitsilano and Downtown Vancouver

TurnFit’s Vancouver studios in Kitsilano and Downtown offer hands-on movement assessment and supervised training. For clients with complex presentations — significant knee pain during most exercise, prior surgeries, or long-standing compensatory patterns — in-person work allows for real-time correction and tactile cueing that accelerates the learning curve.

If you are in Vancouver and want to understand exactly what is driving your knee pain, a TurnFit assessment is the most direct route to that answer.

Online Training: Equally Effective, Available Anywhere in Canada

For TurnFit’s clients outside of Vancouver — whether in Calgary, Toronto, or a smaller community where specialist personal training is hard to find — the online training programme delivers the same assessment-driven, hip-dominant protocols.

A 2024 randomised controlled trial published in the International Journal of Exercise Science found that remote and in-person training produced statistically equivalent improvements in strength, body composition, and metabolic health across 12 weeks of identically programmed training. The key ingredient is programming quality and coaching accountability — not physical proximity. (Peña et al., 2024 — Int J Exerc Sci)

TurnFit’s online clients complete their video assessment, receive a written programme with exercise videos and technique cues, and check in regularly with their coach. The same foot-to-pelvis-to-glute assessment framework applies; the delivery simply adapts to the medium.

What to Expect in 6–12 Weeks

One of the most important things we tell new clients at TurnFit is this: your body did not develop this dysfunction overnight, and it will not correct it overnight. But with the right programme, meaningful change happens faster than most people expect.

Weeks 1–2: Activation and Awareness

The first two weeks focus on re-establishing the neuromuscular connection to the glutes. For many women — particularly those who have been desk-bound for years — the gluteus medius and maximus need to be “reminded” how to fire before they can be effectively loaded. Exercises in this phase are low-load, higher-repetition, and focus on activation quality. Pain may not change significantly yet, but the foundation is being built.

Key movements: clamshells, lateral band walks, glute bridges, hip flexor stretching, single-leg balance work.

Weeks 3–4: Loading the Chain

Once activation quality improves, load is introduced progressively. Hip thrusts, step-ups, and split squats enter the programme. Knee loading begins cautiously — partial-range squatting, wall sits — within a pain-free zone. Most clients notice measurable improvements in stair climbing and prolonged walking during this phase.

Key movements: hip thrusts, goblet squats (partial), step-ups, lateral lunges, single-leg deadlifts (light load).

Weeks 5–6: Strength and Movement Pattern Re-education

This is where clinical trials typically measure their outcomes — and where the data shows 50%+ VAS pain reduction in well-designed hip-dominant programmes. Load increases on all hip exercises. Full-range knee exercises are reintroduced where pain permits. Movement patterns are refined: the knee should now be tracking consistently over the second toe rather than collapsing medially.

Key movements: progressive hip thrusts, Bulgarian split squats, Romanian deadlifts, full-range squats, box step-ups with load.

Weeks 7–12: Consolidation and Return to Full Activity

By weeks 7–12, most clients have returned to their previously painful activities with significantly reduced or absent symptoms. Running, group fitness, recreational sport, and workplace stair climbing are re-integrated progressively. Strength continues to build. The programme shifts from rehabilitation to performance — because the goal is not just pain-free daily life; it is a body that can do what you ask of it for decades.

For long-standing or complex presentations, the timeline may extend. But the trajectory is consistent: the right hip-dominant programme, persistently applied, produces cumulative and durable results.

TurnFit also offers dedicated posture and mobility programmes that complement the strength work — particularly for clients whose knee pain has significant APT, hip flexor tightness, or thoracic mobility components.

Frequently Asked Questions