Scaphoid shift in the uninjured wrist

Area of Science:

• Orthopedics
• Anatomy
• Biomechanics

Background:

• The scaphoid shift maneuver is a clinical test used to assess wrist instability.
• Understanding the prevalence of a positive scaphoid shift in an uninjured population is crucial for accurate diagnosis.

Purpose of the Study:

• To determine the prevalence of a positive scaphoid shift in individuals without a history of wrist trauma or instability.
• To investigate the correlation between a positive scaphoid shift and generalized ligamentous laxity.
• To assess the relationship between a positive scaphoid shift and radiographic carpal alignment.

Main Methods:

• Physical and radiographic evaluation of 100 patients presenting with non-traumatic wrist symptoms.
• Bilateral performance of the scaphoid shift maneuver and assessment of generalized ligamentous laxity.
• Radiographic analysis including measurement of radiolunate and scapholunate angles.

Main Results:

• A positive scaphoid shift was observed in 32% of the study population, and it was consistently painless.
• A positive scaphoid shift was significantly associated with increased generalized ligamentous laxity.
• No correlation was found between a positive scaphoid shift and radiographic carpal malalignment.

Conclusions:

• The scaphoid shift maneuver can be positive in a significant portion of the asymptomatic population.
• Generalized ligamentous laxity is a key factor associated with a positive scaphoid shift.
• A positive scaphoid shift should be interpreted in the context of overall ligamentous laxity and not solely as an indicator of carpal malalignment.