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Pressure-volume relationships in equine midcarpal joint
J Hardy1, A L Bertone, W W Muir
1Department of Veterinary Clinical Sciences, Ohio State University, Columbus 43210, USA.
Summary
Equine midcarpal joint pressure-volume relationships are influenced by joint angle and fluid type. Synovial fluid plays a key role, affecting joint elastance and hysteresis.
Area of Science:
- Equine Orthopedics
- Biomechanical Engineering
- Veterinary Physiology
Background:
- Understanding the pressure-volume (PV) relationships of synovial joints is crucial for diagnosing and managing joint conditions.
- Factors influencing these relationships in equine joints require further elucidation.
Purpose of the Study:
- To determine the effects of joint angle, fluid infusion, history-dependence, and time dependence on the PV relationships of normal equine midcarpal joints.
Main Methods:
- Anesthetized horses (n=24) underwent cannulation of midcarpal joint pouches for intra-articular pressure (IAP) measurements.
- Fluid (synovial fluid or saline) was infused/withdrawn, and PV curves were generated at different joint angles (90° vs. 135°).
Main Results:
- PV curves were sigmoid, described by IAP = A x e(B x volume) - C.
- Elastance was higher at lower pressures, 90° angles, and with saline vs. synovial fluid.
- Hysteresis was greater at 90° angles and with synovial fluid vs. saline.
Conclusions:
- Synovial fluid significantly influences articular PV relationships.
- Joint angle, prior distention cycles, and time-dependent IAP decay are critical factors in equine joint biomechanics.