PMC5127385_01
Plain x-ray, computed tomography (CT), and magnetic resonance imaging (MRI) of the right fourth finger. (a) Plain X-ray, (b) coronal CT section, (c) T1-weighted MRI image. Plain X-ray and CT images show a bone defect on the radial side of the head of the proximal phalanx and a fragment (white arrows). MRI image shows an osteochondral lesion without associated radial collateral ligament tear (white triangle).
icrp_a_1257355_f0001_b.jpg
PMC5127385_01_icrp_a_1257355_f0001_b.jpg
F0001
Plain X-ray and computed tomography (CT) images showed a bone defect with a tiny adjacent fragment at the radial side of the head of the fourth right proximal phalanx (Figure 1(a),(b)). From these findings, we diagnosed osteochondral dissecans (Figure 1(c)), with the fragment representing a loose body.
Macro- and microscopic findings of the loose body. (a) Extracted loose body (approximately 2.5 mm in diameter) with synovial tissue. (b) Histological findings of the loose body, which consists of cartilage with a tide mark (black arrow) separating it from bone tissue. The surface of the cartilage is covered with fibrous tissue (F: fibrous tissue, C: cartilage tissue, B: bone tissue).
icrp_a_1257355_f0002_c.jpg
PMC5127385_01_icrp_a_1257355_f0002_c.jpg
F0002
The resected loose body was approximately 2.5 mm in diameter (Figure 2(a)).
Plain X-rays of the right fourth finger at final examination 6 months after surgery. The loose body is no longer visible, and there is no evidence of osteoarthritis.
icrp_a_1257355_f0003_b.jpg
PMC5127385_01_icrp_a_1257355_f0003_b.jpg
F0003
Pathological diagnosis was a loose body of osteochondritis dissecans (Figure 3(b)).