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Case A 57-year-old man presented with paleness and coolness of the hand with elbow flexion 4 months after primary distal biceps repair. Diagnosis of dynamic brachial artery entrapment was confirmed with ultrasound and Magnetic Resonance Angiography. During revision surgery, the brachial artery was identified traveling underneath the repaired distal biceps tendon. After revision surgery, the patient made a full recovery with no residual symptoms. Conclusion Adverse vascular events have been rarely reported in distal biceps repairs. Before and immediately after repair, the path of the tendon should be critically evaluated to ensure neurovascular structures were not placed under the repaired tendon.

Case An 11-month-old boy was brought to the emergency department because he was refusing to use his right arm. X-rays demonstrated an anteroinferior Salter-Harris I fracture-dislocation of the proximal humeral epiphysis. Closed reduction with sedation was unsuccessful, so open reduction under general anesthesia was pursued. At 2 years, the patient has made a full recovery. Conclusion Pediatric shoulder fracture-dislocations are rare. Clinicians must have a high index of suspicion for nonaccidental trauma when evaluating such injuries. When this injury is encountered in patients younger than 1 year, open reduction of the proximal humeral epiphysis can be a successful treatment option.

Case There is a paucity of literature regarding pediatric upper cervical spine traumatic instability, atlanto-occipital dislocations, and fractures, with no clear treatment algorithm. We present a 12-year-old girl with significant posterior C1-C2 distraction and resultant ligamentous injury after a motor vehicle collision who was treated with a halo vest for 3 months. At 8-month follow-up, follow-up magnetic resonance imaging demonstrated complete ligamentous healing without instability on dynamic radiographs, and at 18-month follow-up, the patient made a full recovery. Conclusion In some pediatric patients with isolated posterior ligamentous injury, as long as anatomic alignment can be achieved with halo-vest application, a fusion may be avoided.

CASE We describe the case of a 3-year-old boy who presented with limited flexion in the left knee. High-resolution magnetic resonance imaging allowed visualization of a fibrotic muscle band in the anatomic position of the fifth component of the quadriceps muscle, which was confirmed by surgical findings. After surgical resection, the patient achieved full recovery of range of motion of the knee. CONCLUSION To our knowledge, this is the first reported case of a fibrotic muscle band in the anatomic position of a previously described fifth accessory component of the quadriceps muscle that caused limited knee flexion in a child.

Case: We present the case of a twenty-one-year-old right-hand-throwing, right-hand-batting female softball pitcher who presented with a three-month history of right rib pain. A bone scan showed increased uptake in the lateral aspect of the right seventh rib, consistent with a stress fracture. The patient was managed nonoperatively and made a full recovery. Conclusion: The forces created by the attachment of the serratus anterior during underhand throwing are the likely etiology of the injury in our patient. Physicians should maintain a high clinical index of suspicion for stress fracture in underhand athletes with lateral rib pain.

Case: We describe a case of an adolescent athlete who sustained a greater trochanteric avulsion fracture. After conservative management with abduction bracing, the patient made a full recovery, with no signs of osteonecrosis at 12 months. We describe the presentation, the course of recovery, and the literature regarding treatment and outcomes. Conclusion: Isolated fracture of the greater trochanteric apophysis is a rare but possibly devastating injury to the adolescent hip when complicated by osteonecrosis. We describe the successful conservative treatment of this injury in what we believe to be the second such report in the English-language literature.

Case: We present a case of rice-body formation and partial flexor tendon rupture in a 3-year-old child with seronegative juvenile idiopathic arthritis (JIA), which presented as a painless soft-tissue mass of the volar aspect of the hand. The diagnosis was not confirmed until histologic examination. The patient was managed with a tenosynovectomy and oral medication; he made a full recovery. Conclusion: JIA is one of the most common rheumatologic conditions of childhood. Establishing the diagnosis can be challenging in very young children, particularly when clinical presentation is atypical and serology is negative. Surgical intervention may be warranted in the appropriately selected patient with JIA.

CASE We present a 44-year-old man diagnosed with atraumatic, idiopathic acute compartment syndrome (ACS) of the left lower extremity treated with an emergent single incision fasciotomy with the release of the anterior and lateral compartments. The patient's condition was diagnosed without delay and successfully treated, resulting in a full recovery. CONCLUSION Immediate diagnosis and emergent surgical treatment of atraumatic ACS is critical in preventing surgical complications and preserving function of the limb. Recognition of this condition existing in the absence of the typical history of an inciting event or underlying predisposition is important to avoid missing the need for emergent surgical intervention.