Suture-Based Distal Radioulnar Joint Stabilization: A Biomechanical Evaluation in a Cadaveric Model

Area of Science:

• Orthopedic Surgery
• Biomechanics
• Upper Extremity Reconstruction

Background:

• Acute distal radioulnar joint (DRUJ) instability management is challenging, with current treatments like immobilization or surgical repair limiting early motion.
• Existing methods for DRUJ instability often involve prolonged immobilization or complex repairs, hindering early functional recovery.
• The need for a DRUJ instability treatment that permits early range of motion is critical for patient outcomes.

Purpose of the Study:

• To evaluate the feasibility of a suture-based stabilization (SBS) technique for acute distal radioulnar joint (DRUJ) instability.
• To determine if the SBS technique allows for early active motion in patients with acute DRUJ instability.
• To biomechanically assess the stability provided by the SBS technique compared to an intact DRUJ.

Main Methods:

• A biomechanical study was conducted on eight cadaveric arms with induced bidirectional DRUJ instability.
• The suture-based stabilization (SBS) technique utilized 2-mm suture tapes with button fixation to mimic native ligamentous structures.
• Specimens underwent cyclic loading under simulated ballottement stress in various forearm positions (neutral, pronation, supination) to measure range of motion and translation.

Main Results:

• The SBS technique demonstrated a comparable average range of motion (175 degrees) to the intact state (174 degrees).
• No significant differences in displacement were observed between the intact and SBS groups in neutral and supination.
• The SBS group exhibited reduced translation compared to the intact group specifically in the pronation position.

Conclusions:

• The described suture-based stabilization (SBS) technique provides biomechanical stability comparable to the native intact distal radioulnar joint (DRUJ).
• This SBS technique does not compromise the range of motion in a cadaveric model of acute DRUJ instability.
• Further comparative studies are necessary before clinical application of this promising technique for DRUJ instability.