Biomechanics and Clinical Management of Distal Radioulnar Joint Injuries

The distal radioulnar joint (DRUJ) enables smooth forearm pronation and supination by permitting axial rotation and translation between the distal radius and ulna. Stability is conferred by intrinsic structures—the triangular fibrocartilage complex (TFCC), dorsal and volar radioulnar ligaments—and by extrinsic constraints such as the interosseous membrane (IOM) and the joint capsule. Injury mechanisms range from acute trauma, often involving TFCC tears and ulnar styloid fractures, to chronic degeneration with attenuated ligamentous support. Clinical presentations include pain at the ulnar wrist, loss of rotational range of motion and mechanical symptoms of clicking or subluxation. Diagnostic evaluation combines physical tests for DRUJ laxity with imaging modalities: plain radiography for osseous alignment, computed tomography for quantification of translation, and magnetic resonance imaging or arthrography for soft-tissue integrity. Management strategies span conservative approaches—immobilisation, activity modification and guided injections—to surgical interventions. Arthroscopic and open techniques aim at TFCC repair or reconstruction; in cases of malunion or gross instability, salvage procedures such as the Sauvé–Kapandji or Darrach operations may be indicated. Postoperative rehabilitation focuses on graduated loading to restore stability and function while minimising fibrous adhesions. The global burden of DRUJ injury underscores the need for refined biomechanical understanding to optimise patient-specific interventions and improve long-term outcomes.

Research from Nature Portfolio

Recent studies have applied advanced image-matching techniques to characterise in vivo forearm kinematics and elucidate the role of the interosseous membrane in DRUJ stability. Using biplane fluoroscopy coupled with three-dimensional registration, researchers have quantified axial translations and relative proximodistal shifts of the radius and ulna throughout pronosupination. The work demonstrates that components of the IOM, notably the central band, exhibit dynamic length changes that correlate with specific phases of rotation, thereby acting as tension modulators to prevent subluxation. These insights refine existing biomechanical models and may inform the design of reconstruction grafts that restore native tension patterns across the DRUJ.

Biomechanics and Clinical Management of Distal Radioulnar Joint Injuries publication trend

The graph below shows the total number of articles in biomechanics and clinical management of distal radioulnar joint injuries across all publications each year (not limited to Nature Index journals).

Technical terms

Distal Radioulnar Joint (DRUJ): The articulation between the distal ends of the radius and ulna that permits forearm rotation.

Triangular Fibrocartilage Complex (TFCC): A composite of ligaments, meniscus homologue and articular disc that stabilises the DRUJ and ulnocarpal joint.

Interosseous Membrane (IOM): A fibrous sheet connecting the shafts of the radius and ulna, transmitting load and restraining translation during rotation.

Arthroscopic Repair: A minimally invasive surgical technique using an endoscope to visualise and suture torn soft-tissue structures.

References

1. Reproduction of forearm rotation dynamic using intensity-based biplane 2D–3D registration matching method. Scientific Reports (2024).
2. Open versus arthroscopic repair of the triangular fibrocartilage complex: a systematic review. Journal of Experimental Orthopaedics (2018).
3. Computed tomography for the detection of distal radioulnar joint instability: normal variation and reliability of four CT scoring systems in 46 patients. Skeletal Radiology (2016).
4. Anatomic Reconstruction of the Distal Radioulnar Ligament for Posttraumatic Distal Radioulnar Joint Instability. Clinics in Orthopedic Surgery (2009).