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Intra-articular pressure as a factor in initiating ulnar drift
The Journal of Bone and Joint Surgery. American Volume
|April 1, 1978
Summary
Elevated intra-articular pressure in metacarpophalangeal joints may initiate ulnar drift. This study suggests increased joint pressure could be a factor in rheumatoid arthritis development.
Area of Science:
- Orthopedics
- Rheumatology
- Anatomy
Background:
- Ulnar drift is a common deformity in rheumatoid arthritis patients.
- The exact mechanism initiating ulnar drift remains incompletely understood.
Purpose of the Study:
- To investigate the potential role of increased intra-articular pressure in causing ulnar drift.
- To explore the relationship between joint pressure and metacarpophalangeal joint deformities.
Main Methods:
- Metacarpophalangeal joints from fresh cadavers were utilized.
- Intra-articular pressure was artificially increased by injecting water into the joints.
- Joint displacement was measured to assess the effects of elevated pressure.
Main Results:
- Increased intra-articular pressure induced ulnar deviation in 23 of 32 joints.
- Flexion occurred in 24 joints, and combined ulnar deviation and flexion (ulnar drift) in 19 joints.
- Minor instances of extension or radial deviation were also observed.
Conclusions:
- Elevated intra-articular pressure is a potential factor in the initiation of ulnar drift.
- Findings suggest a biomechanical link between joint pressure and rheumatoid arthritis deformities.