This retrospective cohort study of 120 ankles asked whether a critical defect size threshold exists for poor outcomes after arthroscopic marrow stimulation of osteochondral lesions of the talus. Defect area was measured on preoperative MRI and correlated with AOFAS scores and need for osteochondral transplantation at mean 44.5-month follow-up.
When a patient comes in with chronic ankle pain and OLT on MRI, most surgeons historically estimated lesion size by eyeball or plain radiograph — both methods are unreliable, and no one had defined a preoperative threshold to guide the decision between marrow stimulation and osteochondral transplantation.
This paper gives you a number: calculate defect area from the MRI report (coronal length × sagittal length × 0.79). If the area is below 150 mm2, arthroscopic marrow stimulation is a reasonable first-line treatment with a 90% success rate. If it is at or above 150 mm2, the failure rate is 80%. Have a frank preoperative conversation and consider osteochondral transplantation or ACI from the outset rather than staging through a likely-to-fail marrow stimulation first.
The factors you might instinctively use. How long the patient has had symptoms, whether there was a traumatic mechanism, medial versus lateral location. Do not predict outcome. Defect area is the variable that matters.
The 150 mm2 threshold aligns with the 1.5 cm2 cutoff cited in prior literature (Giannini and Vannini), giving this number double validation and making it the most board-testable fact in OLT management.
This retrospective cohort study of 120 ankles asked whether a critical defect size threshold exists for poor outcomes after arthroscopic marrow stimulation of osteochondral lesions of the talus. Defect area was measured on preoperative MRI and correlated with AOFAS scores and need for osteochondral transplantation at mean 44.5-month follow-up.
When a patient comes in with chronic ankle pain and OLT on MRI, most surgeons historically estimated lesion size by eyeball or plain radiograph — both methods are unreliable, and no one had defined a preoperative threshold to guide the decision between marrow stimulation and osteochondral transplantation.
This paper gives you a number: calculate defect area from the MRI report (coronal length × sagittal length × 0.79). If the area is below 150 mm2, arthroscopic marrow stimulation is a reasonable first-line treatment with a 90% success rate. If it is at or above 150 mm2, the failure rate is 80%. Have a frank preoperative conversation and consider osteochondral transplantation or ACI from the outset rather than staging through a likely-to-fail marrow stimulation first.
The factors you might instinctively use. How long the patient has had symptoms, whether there was a traumatic mechanism, medial versus lateral location. Do not predict outcome. Defect area is the variable that matters.
The 150 mm2 threshold aligns with the 1.5 cm2 cutoff cited in prior literature (Giannini and Vannini), giving this number double validation and making it the most board-testable fact in OLT management.