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.
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"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."
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00:00 – 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
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