| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Structure of capsule of metacarpophalangeal joint of thumb | Is a | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier |  | 
| Entire metacarpophalangeal joint of thumb | Is a | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier |  | 
| Stabilization of metacarpophalangeal joint of thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Prosthetic total arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 3 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 3 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 5 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Amputation of thumb through metacarpophalangeal joint | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Open dislocation of metacarpophalangeal joint of thumb | Finding site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Closed traumatic dislocation of metacarpophalangeal joint of thumb | Finding site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Traumatic amputation, thumb, through metacarpophalangeal joint | Finding site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Chronic instability of the metacarpophalangeal joint of thumb | Finding site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Volar plate injury, thumb, metacarpophalangeal joint | Finding site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 3 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 3 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 3 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 3 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 3 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 3 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 3 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 3 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 3 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 3 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 3 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Stabilization of metacarpophalangeal joint of thumb | Procedure site - Direct | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site - Direct | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Prosthetic total arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site - Direct | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site - Direct | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site - Indirect | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site - Direct | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site - Direct | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site - Direct | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site - Direct | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Amputation of thumb through metacarpophalangeal joint | Procedure site - Direct | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Open dislocation of metacarpophalangeal joint of thumb | Finding site | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site - Direct | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Closed traumatic dislocation of metacarpophalangeal joint of thumb | Finding site | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Prosthetic total arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site - Direct | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site - Direct | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Prosthetic hemiarthroplasty of the metacarpophalangeal joint of the thumb | Procedure site - Indirect | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Chronic instability of the metacarpophalangeal joint of thumb | Finding site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Stabilization of metacarpophalangeal joint of thumb | Procedure site - Direct | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Volar plate injury, thumb, metacarpophalangeal joint | Finding site | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Amputation of thumb through metacarpophalangeal joint | Procedure site - Direct | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Interposition arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site - Direct | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 2 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site - Direct | False | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Excision arthroplasty of the metacarpophalangeal joint of the thumb | Procedure site - Direct | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Traumatic dislocation of metacarpophalangeal joint of thumb | Finding site | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 | 
| Structure of metacarpophalangeal joint of right thumb | Is a | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier |  | 
| Structure of metacarpophalangeal joint of left thumb | Is a | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier |  | 
| Chronic instability of the metacarpophalangeal joint of thumb | Finding site | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 3 | 
| Structure of articular surface, phalanges, of first metacarpal bone | Is a | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier |  | 
| Structure of ligament of metacarpophalangeal joint of thumb | Is a | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier |  | 
| Traumatic amputation, thumb, through metacarpophalangeal joint | Finding site | True | Metacarpophalangeal joint structure of thumb | Inferred relationship | Existential restriction modifier | 1 |