Calcaneocuboid stability: a clinical and anatomic study.

Area of Science:

• Orthopedics
• Biomechanics
• Anatomy

Background:

• Midtarsal joint injuries, including calcaneocuboid joint issues, are infrequent and often missed.
• Acute and chronic instability of the calcaneocuboid joint can result from these injuries.
• There is a lack of established data on normal calcaneocuboid joint laxity.

Purpose of the Study:

• To determine normal ranges of calcaneocuboid joint laxity.
• To quantify the contribution of specific ligaments to calcaneocuboid joint stability.
• To provide a baseline for identifying pathological calcaneocuboid instability.

Main Methods:

• Utilized a previously described stress radiography technique on human cadaveric specimens.
• Performed serial sectioning of the ligamentous supports of the calcaneocuboid joint.
• Measured changes in calcaneocuboid gap and angle under stressed and unstressed conditions.

Main Results:

• Significant differences in calcaneocuboid gap and angle were observed between unstressed and stressed states.
• Cadaveric testing demonstrated that both dorsal and plantar calcaneocuboid ligaments significantly contribute to joint stability.
• Normal ranges for calcaneocuboid joint laxity were established.

Conclusions:

• Defining normal calcaneocuboid joint stability and ligamentous contributions is essential for diagnosing and treating calcaneocuboid instability.
• This research provides a foundation for identifying abnormal laxity patterns.
• Understanding normal biomechanics aids in improved clinical assessment and management of calcaneocuboid injuries.