| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Open dislocation of metacarpophalangeal joint of finger | Is a | True | Knuckle injury | Inferred relationship | Existential restriction modifier |  | 
| Traumatic amputation, finger, through metacarpophalangeal joint | Is a | True | Knuckle injury | Inferred relationship | Existential restriction modifier |  | 
| Closed traumatic dislocation of metacarpophalangeal joint of finger | Is a | False | Knuckle injury | Inferred relationship | Existential restriction modifier |  | 
| Metacarpophalangeal sprain | Is a | False | Knuckle injury | Inferred relationship | Existential restriction modifier |  | 
| Sprain finger, metacarpophalangeal joint, nonspecific | Is a | False | Knuckle injury | Inferred relationship | Existential restriction modifier |  | 
| Sprain finger, metacarpophalangeal joint, radial collateral ligament | Is a | False | Knuckle injury | Inferred relationship | Existential restriction modifier |  | 
| Sprain finger, metacarpophalangeal joint, ulnar collateral ligament | Is a | False | Knuckle injury | Inferred relationship | Existential restriction modifier |  | 
| Volar plate injury of metacarpophalangeal joint of finger | Is a | False | Knuckle injury | Inferred relationship | Existential restriction modifier |  | 
| Open division, finger, metacarpophalangeal joint, radial collateral ligament | Is a | True | Knuckle injury | Inferred relationship | Existential restriction modifier |  | 
| Open division, finger, metacarpophalangeal joint, ulnar collateral ligament | Is a | True | Knuckle injury | Inferred relationship | Existential restriction modifier |  | 
| Traumatic dislocation of metacarpophalangeal joint of finger | Is a | False | Knuckle injury | Inferred relationship | Existential restriction modifier |  | 
| Traumatic rupture of ligament of metacarpophalangeal joint of finger | Is a | True | Knuckle injury | Inferred relationship | Existential restriction modifier |  | 
| Sprain of ligament of metacarpophalangeal joint of finger | Is a | True | Knuckle injury | Inferred relationship | Existential restriction modifier |  | 
| Sprain of ligament of metacarpophalangeal joint of index finger | Is a | True | Knuckle injury | Inferred relationship | Existential restriction modifier |  |