Ep 378: Bone Stress Injuries: Causes, Symptoms & Early Warning Signs (Part 1)
The Physical Performance Show
Continuum: From Healthy Bone to Stress Fracture
Brad explains the Fredericson grading scale, stress reactions versus cortex-breaching stress fractures and mechanical consequences.
In episode 378 of The Physical Performance Show, host Brad Beer is joined by Pogo physiotherapist Tim Studley for the first instalment of a three-part expert series exploring bone stress injuries. Drawing on decades of clinical experience and the latest research, Brad unpacks the mechanisms behind one of the most common and misunderstood injuries affecting endurance athletes.
This episode explains how bone stress injuries develop, why they occur, and why they're often missed until they become more serious. Brad and Tim discuss the relationship between training load, bone physiology, symptom progression, and risk factors, while providing practical insights for athletes, coaches, and clinicians seeking to identify problems before they become stress fractures.
Show Sponsor:PILLAR Performance is leading a new frontier in sports nutrition through micronutrition innovation. Their new Collagen Repair formula, developed in collaboration with Gelita Laboratories, is designed to support tendon and ligament health while promoting collagen synthesis to help athletes stay healthy and perform at their best.
For 15% off your first order, visit pillarperformance.shop (or thefeed.com for North American listeners) and use the discount code PHYSICALPERFORMANCE (one word, capitals) at checkout.
In this episode, you'll hear- Why bone stress injuries exist on a continuum—from healthy bone through stress reactions to true stress fractures
- The biology of bone remodelling: osteoclasts, osteoblasts, microcracks, and why recovery is essential
- Why running intensity has a far greater impact on bone stress injury risk than training volume alone
- How a 10% increase in running pace can dramatically reduce the bone's fatigue threshold
- Why many athletes mistakenly blame the "last run" rather than the workload accumulated four weeks earlier
- The importance of deload weeks and allowing the skeleton time to repair accumulated microdamage
- Understanding the Fredericson grading system and what distinguishes stress reactions from stress fractures
- Why shin splints (medial tibial stress syndrome) are not the same as a bone stress injury
- How pain location and symptom behaviour provide more valuable diagnostic information than pain intensity
- Why serious bone stress injuries can sometimes hurt less than relatively minor periosteal injuries
- The progression of symptoms from post-run discomfort to persistent and night pain
- How clinicians assess training history, workload, Strava data, intensity distribution, terrain, and footwear
- The major biomechanical and biological risk factors that contribute to bone stress injuries
- Previous bone stress injuries as one of the strongest predictors of future injury
- The emerging discussion around performance footwear ("super shoes") and potential changes in bone loading
- Why muscle strength and tissue capacity remain important contributors to skeletal resilience
"A bone stress injury is simply stress of a bone."
"It's not usually the kilometres that catch people out—it's the intensity."
"Don't judge the severity of a bone injury by how painful it is."
"Symptoms often appear around four weeks after the training error—not the day after."
"If it's really obvious, it's probably important."
Show SponsorPILLAR Performance creates evidence-based sports micronutrition products designed to support recovery, sleep, health, and performance for athletes and active people.
For all your PILLAR products visit https://PillarPerformance.shop, or for our North American listeners, head to https://TheFeed.com.
🔥 For 15% off your first purchase enter PHYSICALPERFORMANCE at the checkout.
Timeline00:00 – Introduction, sponsor and overview of the new three-part Bone Stress Injury series
02:27 – Brad introduces expert editions and welcomes Tim Studley
03:54 – What is a bone stress injury?
04:23 – Bone loading explained: intensity versus training volume
06:50 – Bone physiology: microcracks, osteoclasts and osteoblasts
08:44 – Why recovery weeks are critical for skeletal health
09:14 – Bone remodelling timelines and why symptoms are delayed
11:40 – Bone stress injuries versus stress fractures
13:05 – The Fredericson grading system explained
14:26 – Shin splints (MTSS) versus bone stress injuries
15:21 – Why pain severity doesn't reflect injury severity
17:42 – The importance of symptom behaviour over pain intensity
19:08 – The progression of bone stress injury symptoms
20:30 – Taking a running history: training load, Strava and identifying workload errors
22:22 – Why today's symptoms often reflect training from four weeks earlier
23:20 – Biomechanical versus biological risk factors
24:17 – Previous bone stress injuries as a major predictor of recurrence
24:47 – Performance footwear ("super shoes") and emerging research
26:03 – Terrain, footwear changes and other biomechanical considerations
26:57 – Muscle capacity, tissue resilience and assessing the athlete
THE TEAM:
Join the The Physical Performance Show LEARNINGS membership through weekly podcasts here: https://www.patreon.com/TPPShow
Our goal is to get you back to your Physical Best. Find out more about Telehealth Consultations and book online.
Your Host: 🏃 Brad Beer - Instagram & X @Bradbeer and YouTube on @PogophysioAu
The Physical Performance Show can be found at: Facebook: facebook.com/thephysicalperformanceshowpodcast X: @tppshow1 Instagram: @physicalperforamceshow
Please direct any questions, comments, and feedback to the above social media handles.
*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-(--sticky-padding-top)" dir="auto" data-turn-id="081498ac-bc39-4ab2-a81c-691cffa69424" data-turn-id-container="081498ac-bc39-4ab2-a81c-691cffa69424" data-testid="conversation-turn-5" data-turn="user">The AI-powered Podcast Player
