| Type | Description | Treatment |
| 1 | Boutonniere (most common) | Synovectomy with extensor hood reconstruction; MCP fusion or arthroplasty |
| 2 | Boutonniere with CMC subluxation (uncommon; Type 1 + Type 3) | Same as type 1 and type 3 |
| 3 | Swan neck deformity (2nd most common) | Splinting vs CMC arthroplasty; MCP fusion |
| 4 | Gamekeeper deformity | Synovectomy/UCL reconstruction or Fusion |
| 5 | Swan neck with MCP disease | Fusion of MCPJ |
| 6 | Arthritis mutilans | Arthrodesis |
Clinically, the Van Beek classification system denominates 5 principal nail bed injuries, subclassified by location within the nailbed (involving either the sterile and/or germinal matrix, respectively) and the extent of injury. Germinal Matrix Injury GI: Small subungual hematoma proximal nail (<25%) GII: Germinal matrix laceration, large subungual hematoma (>50%) GIII:…
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