Case presentation A 48-year-old male presented to the hospital with severe pain and stiffness in the left small finger (LSF) for the past three months. His LSF was crushed in a door three months ago, and the X-ray image showed no soft-tissue injuries, dislocation, or acute fracture at the time ( Cover image, Figure 1 ). The ulnar gutter splint was used to manage his crushed LSF.

However, the patient removed it in a month because of no improvement in the pain. The patient underwent hand rehabilitation and therapy for three weeks and achieved minimal functional improvement. Physical examination of LSF Overt shininess Edema Severely tender to palpation Moderate hypersensitivity to light touch Intact motor strength to extrinsic and intrinsic muscles Minimal active flexion at the distal interphalangeal (DIP) and proximal interphalangeal (PIP) joints A little amount of flexion was retained at…