Related Experiment Videos
Summary
The Mulder-Landsmeer phenomenon, an inability to fully straighten finger joints, was observed in hypermobile South Indian individuals. This study details a limited de-extension of the proximal phalanx during interphalangeal extension in these subjects.
Area of Science:
- Orthopedics
- Human Anatomy
- Biomechanics
Background:
- The Mulder-Landsmeer phenomenon describes a specific limitation in finger joint extension.
- Hypermobility in certain populations, such as South Indians, may influence joint mechanics.
- Understanding these phenomena is crucial for diagnosing and managing hand conditions.
Purpose of the Study:
- To investigate the presence and characteristics of the Mulder-Landsmeer phenomenon in South Indian individuals.
- To analyze the biomechanical implications of passive metacarpophalangeal joint hyperextension on interphalangeal joint extension.
- To document observations of proximal phalanx de-extension during specific joint movements.
Main Methods:
- Assessment of the Mulder-Landsmeer phenomenon in a cohort of South Indian participants.
- Passive positioning of the metacarpophalangeal joint in maximal hyperextension.
- Observation and documentation of active interphalangeal joint extension capabilities.
Main Results:
- Confirmation of the Mulder-Landsmeer phenomenon in normally hypermobile South Indian fingers.
- Observation of a significant, yet limited, de-extension of the proximal phalanx.
- This de-extension occurred during the completion of interphalangeal extension under specific passive joint positioning.
Conclusions:
- The Mulder-Landsmeer phenomenon is present in hypermobile South Indian populations.
- A distinct proximal phalanx de-extension is a notable characteristic associated with this phenomenon in this group.
- Findings contribute to the understanding of finger joint biomechanics in hypermobile individuals.