This landmark 1959 cadaveric and clinical study by Berndt and Harty asks whether osteochondritis dissecans of the talar dome and 'flake fractures' are the same traumatic entity. Using amputation specimens and a review of 183 published cases, they define the injury mechanism, propose a four-stage classification, and evaluate treatment outcomes.
For decades, these lesions were called either 'fractures' or 'osteochondritis dissecans' as if they were separate entities — and neither camp had a coherent explanation for why a fracture could occur without pain, without apparent trauma, and without healing after immobilization.
Berndt and Harty resolved all three paradoxes: torsional impaction generates enough force to fracture the medial dome without tearing ligaments (explaining 'atraumatic' cases), articular cartilage lacks sensory nerves (explaining painlessness), and healing requires months of uninterrupted capillary ingrowth that routine short immobilization destroys.
In practice: when a young patient presents with persistent ankle pain after an inversion sprain, order the oblique view (10 degrees medial rotation). The AP alone misses lateral lesions obscured by the fibula. A sclerotic rim around the crater on plain film signals chronic non-union and predicts conservative treatment failure.
Stage I-II lesions in skeletally immature patients can be trialed with prolonged immobilization, but the 74.6% failure rate of conservative treatment in this series is why higher-stage lesions and failed conservative cases go straight to surgery.
This landmark 1959 cadaveric and clinical study by Berndt and Harty asks whether osteochondritis dissecans of the talar dome and 'flake fractures' are the same traumatic entity. Using amputation specimens and a review of 183 published cases, they define the injury mechanism, propose a four-stage classification, and evaluate treatment outcomes.
For decades, these lesions were called either 'fractures' or 'osteochondritis dissecans' as if they were separate entities — and neither camp had a coherent explanation for why a fracture could occur without pain, without apparent trauma, and without healing after immobilization.
Berndt and Harty resolved all three paradoxes: torsional impaction generates enough force to fracture the medial dome without tearing ligaments (explaining 'atraumatic' cases), articular cartilage lacks sensory nerves (explaining painlessness), and healing requires months of uninterrupted capillary ingrowth that routine short immobilization destroys.
In practice: when a young patient presents with persistent ankle pain after an inversion sprain, order the oblique view (10 degrees medial rotation). The AP alone misses lateral lesions obscured by the fibula. A sclerotic rim around the crater on plain film signals chronic non-union and predicts conservative treatment failure.
Stage I-II lesions in skeletally immature patients can be trialed with prolonged immobilization, but the 74.6% failure rate of conservative treatment in this series is why higher-stage lesions and failed conservative cases go straight to surgery.