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Finger joint contact areas and pressures
Summary
Degenerative joint disease is more common in the distal interphalangeal joint of the index finger. Higher joint contact pressures in this area, measured in vitro, correlate with clinical degeneration patterns, suggesting mechanical stress plays a role.
Area of Science:
- Orthopedics
- Biomechanics
- Rheumatology
Background:
- Degenerative joint disease (DJD) disproportionately affects the distal interphalangeal (DIP) joint of the index finger despite geometric similarities with other finger joints.
- Clinical observations suggest a mechanical etiology for the higher prevalence and severity of DJD in the DIP joint.
Purpose of the Study:
- To experimentally determine joint contact areas and average pressures in human index finger joints.
- To investigate the mechanical factors contributing to the observed differences in DJD frequency among index finger joints.
Main Methods:
- In vitro experiments were conducted on human index finger joints.
- Simulated tip pinch and power grasp positions were used to assess joint mechanics.
- Contact areas and average pressures within the joints were measured.
Main Results:
- The highest average joint contact pressures were recorded in the distal interphalangeal joint.
- A strong correlation was found between average joint contact pressure and the clinically observed frequency and severity of DJD.
- Experimental findings align with clinical patterns of degeneration.
Conclusions:
- Mechanical stress is a significant factor in the initiation and/or progression of degenerative joint disease in finger joints.
- The higher mechanical load on the distal interphalangeal joint likely contributes to its increased susceptibility to DJD.