What runner's knee actually is
Patellofemoral pain (PFP) is pain around or behind the kneecap, aggravated by loading a bent knee — running, stairs, squatting, or long sitting ("cinema sign"). It accounts for roughly one in four running injuries.
The key fact: in most cases nothing is structurally damaged. The joint is overloaded, not broken. That's good news — it means the problem is solvable — but it also explains why rest alone fails: rest lowers the load temporarily, but doesn't change what caused the overload.
Why it develops
The kneecap glides in a groove on the femur. Its tracking is governed by everything around it: quadriceps strength and timing, hip control, foot mechanics and training load. The classic recipe for PFP is a sudden increase in training volume on top of one or more of these weaknesses. Clinical guidelines (Willy et al., 2019) identify hip and knee strengthening as the interventions with the strongest evidence — not knee braces, not taping alone, and definitely not rest.
Our phase-by-phase protocol
Phase 0 — Assessment (week 0)
- Biomechanical video analysis: running gait, single-leg squat, step-down
- Digital foot scan and hip strength testing
- Thermography to map the inflammation pattern
- Training history: the "what changed?" conversation — volume, footwear, surfaces
Phase 1 — Calm it down (weeks 1–3)
- Load management, not rest: keep running below the pain threshold (pain ≤3/10 that settles within 24h), reduce hills and stairs
- MLS laser therapy on the peripatellar tissue to accelerate resolution of the irritation
- Isometric quadriceps loading — pain-relieving and strength-preserving
Phase 2 — Build capacity (weeks 3–8)
- Progressive hip strengthening: gluteus medius and external rotators (strongest evidence base — Lack et al., 2015)
- Quadriceps progression: leg press and squats through increasing ranges
- Foot posture correction where indicated (sometimes custom insoles)
- Single-leg control work: step-downs with video feedback
Phase 3 — Rebuild the runner (weeks 6–12)
- Gait retraining where analysis indicates: cadence increase of 5–10% reduces patellofemoral load meaningfully (Esculier et al., 2018)
- Structured return-to-volume plan: no more than 10% weekly progression
- Re-test: strength symmetry, pain-free step-down, video re-analysis
The mistakes that keep runners stuck
- Resting until pain-free, then resuming old volume — the loop that brings people to us after months
- Only stretching — PFP is predominantly a strength and load problem
- Chasing knee-only fixes — the hip and foot usually hold the answer
- Stopping the programme when pain stops — pain resolves before capacity is rebuilt; that gap is where relapse lives
Dealing with runner's knee that keeps coming back? Book a running assessment at Bruno Physical Rehabilitation, Ipswich, Suffolk.
References
- Willy, R.W., Hoglund, L.T., Barton, C.J. et al. (2019) 'Patellofemoral pain: clinical practice guidelines', Journal of Orthopaedic & Sports Physical Therapy, 49(9), pp. CPG1–CPG95.
- Collins, N.J., Barton, C.J., van Middelkoop, M. et al. (2018) 'Consensus statement on exercise therapy and physical interventions to treat patellofemoral pain', British Journal of Sports Medicine, 52(18), pp. 1170–1178.
- Lack, S., Barton, C., Sohan, O., Crossley, K. and Morrissey, D. (2015) 'Proximal muscle rehabilitation is effective for patellofemoral pain: a systematic review with meta-analysis', British Journal of Sports Medicine, 49(21), pp. 1365–1376.
- Esculier, J.F., Bouyer, L.J., Dubois, B. et al. (2018) 'Is combining gait retraining or an exercise programme with education better than education alone in treating runners with patellofemoral pain?', British Journal of Sports Medicine, 52(10), pp. 659–666.
- Clijsen, R. et al. (2017) 'Effects of low-level laser therapy on pain in patients with musculoskeletal disorders: a systematic review and meta-analysis', European Journal of Physical and Rehabilitation Medicine, 53(4), pp. 603–610.