CASEAn 11-month-old girl was brought to the pediatric orthopedic clinic for further evaluation and treatment of left wrist pain following a fall 2 days earlier. The patient's mother stated that the child fell backward off a bed and landed on her outstretched hand. The patient was initially evaluated at an urgent care center and placed in a splint for a possible fracture. The remainder of her medical history was unremarkable.Physical examination The examination revealed a well-appearing female child in no apparent distress. No tenderness to palpation or bruising was present on either lower extremity or the right upper extremity. The skin on the left upper extremity was intact and no signifi cant swelling was noted. She was neurovascularly intact throughout the entire extremity. Signifi cant tenderness and discomfort were noted upon palpation about the dorsal aspect of the distal radius. No additional areas of tenderness were present throughout the remainder of the left upper extremity. Radiographs were obtained to further assess the left wrist for a potential fracture. What do Figures 1 and 2 demonstrate?
DISCUSSIONThe images show the unicortical disruption of the dorsal distal radial metaphysis.Fractures about the wrist account for 25% of all pediatric fractures, with the distal radius being the most common site. 1,2 Fractures of the distal radius and forearm are the most common skeletal injuries in children that require surgical care. 3 Distal radius fractures are described according to their location, amount and direction of displacement, angulation, and rotation. Due to the increased porosity of pediatric bone, distal radius fractures typically involve the metaphysis or area about the physis. The distal radius fractures with metaphyseal involvement are classifi ed as torus (buckle) fractures, involving only one cortex, or bicortical fractures, which involve both cortices. 2 Torus fractures result from direct compression of the distal radial metaphysis and subsequently cause cortical failure, usually on the dorsal or radial side. 3 These injuries typically occur as a result of a fall onto an outstretched hand.Torus fractures are characteristically stable due to the unicortical involvement. However, this single cortex involvement makes them inherently less obvious on radiographic examination, sometimes causing the fracture to be missed by the clinician. Excellent bone remodeling occurs, due to the proximity of the fracture to the distal radial physis, which is responsible for the majority of the longitudinal growth of the radius bone. 4 Assessment For orthopedic patients presenting with pain, obtain a detailed patient history pertinent to the injury and FIGURE 1. Lateral view of left wrist showing unicortical disruption of the dorsal distal radial metaphysisFIGURE 2. Posteroanterior view of the left wrist showing unicortical disruption of the dorsal distal radial metaphysis (arrow)