Review Question - QID 220022

A 36-year-old recreational pickleball player presents with a finger deformity of his dominant hand that is preventing him from holding his paddle correctly. He notes that he had a metacarpal fracture in the same hand while playing Division II football in college that he treated non-operatively, and he has always had a "weird" finger since that time. On exam, when the metacarpophalangeal joint (MCPJ) of the index finger is flexed, the proximal interphalangeal joint (PIPJ) is unable to be passively flexed; however, when you passively extend the index finger MCPJ, flexion of the PIPJ improves. The distal interphalangeal joint (DIPJ) is supple and there is no PIPJ hyperextension. Which of the following is the most likely cause of this patient's finger deformity and how should it be treated?