PMC8046466_01
Low-power (a) and high-power (b) histology slides demonstrating mononuclear polygonal chondroblasts in "cobblestone" pattern, and multinucleated giant cells, consistent with chondroblastoma.
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F1
Imaging revealed a bone lesion within the medial femoral condyle, and open biopsy revealed chondroblastoma (Fig. 1).
Arthroscopic images of working curette (A), working biter (B), tumor cavity after excision (C), and tumor cavity after grafting (D). These images were obtained via the single tunnel technique.
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F2
Arthroscopically assisted tumor excision was approached through a single, widened intraosseous tunnel, accommodating insertion of the arthroscope and instruments simultaneously (Fig. 2).
(A and B) Intraoperative arthroscopic image of PCL origin. (C) Histological confirmation of ligamentous tissue biopsied from site.
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F3
Interestingly, the posterior cruciate ligament (PCL) origin was able to be visualized from within the cavity and confirmed histologically (Fig. 3).
PMC8046466_02
Fluoroscopic image of two-tunnel technique being employed to curette lesion under arthroscopic assistance.
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F4
Surgery proceeded according to the two-portal technique, as described above (Fig. 4).
Arthroscopic image of curettage, performed via two-tunnel technique.
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F5
This two-tunnel technique provided minimal disruption to the physis, while facilitating "real-time" visualization of the excision (Fig. 5).
PMC8046466_03
Periarticular chondroblastoma of the right distal femur in a 15-year-old female.
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F6
X-ray and magnetic resonance imaging revealed a marrow replacing T2 hyperintense lesion abutting the articular cartilage of the lateral trochlea (Fig. 6).
Fluoroscopic image of curettage performed through lateral tunnel
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F7
Due to the distal and lateral nature of this tumor, a single-portal technique was utilized (Fig. 7).