UNASSIGNED: Proximal tibiofibular joint (PTFJ) subluxations are rare and can occur following trauma or sporting events. Idiopathic PTFJ subluxations are more common in females and in patients with generalized ligament laxity. The proper history and clinical examination together with imaging can help in establishing the diagnosis in the majority of cases.
UNASSIGNED: We report a rare case of bilateral subluxation of PTFJ and describe the detailed clinical features and magnetic resonance imaging findings. The patient was managed conservatively with good results.
UNASSIGNED: Bilateral subluxation of the PTFJ is a rare clinical entity often associated with specific demographic and physical characteristics, such as young females engaged in high-impact sports. This case underscores the importance of a thorough clinical and imaging evaluation to differentiate it from other causes of lateral knee pain and prominence. Conservative management, including physical therapy and routine follow-ups, has proven effective in managing symptoms and avoiding progression, highlighting the non-operative approach in treating this condition.

暂无摘要。

UNASSIGNED: The outcomes of revision total hip arthroplasty (rTHA) have become increasingly important as their volume increases. Computer navigation, a reliable method to improve component positioning during primary total hip arthroplasty (THA), is not well studied in the rTHA setting. Given that dislocation rates following rTHA are significantly higher than those of primary THA, component positioning becomes paramount in these cases.
UNASSIGNED: Here, we present two case reports and surgical techniques, one of a 77-year-old man undergoing rTHA for recurrent hip instability following primary THA, and one of a 61-year-old woman undergoing rTHA for severe iliopsoas bursitis who was at increased risk for instability and dislocation given her history of large segment spinal fusion.
UNASSIGNED: Both patients achieved optimal acetabular component positioning after rTHA with imageless computer navigation.
UNASSIGNED: The use of imageless computer navigation in rTHA provides accurate and reproducible component positioning during acetabular rTHA.

The radioscaphocapitate ligament is part of the stabilizatory complex of the scaphoid. Isolated injury resulting in persistent radioscaphoid instability is rarely reported. The authors propose a technique for arthroscopic reinforcement. Magnetic resonance, dynamic fluoroscopy, and wrist arthroscopy will confirm the elongation of radioscaphocapitate ligament. Under arthroscopic control, an anchor can be drilled into the radial aspect of the scaphoid to tension the ligament toward the anchor. An arthroscopic reinforcement of the radioscaphocapitate ligament may resolve a persistent radioscaphoid instability due to elongation.

UNASSIGNED: This study aimed to introduce a novel arthroscopic treatment for medial and posteromedial instability of the knee and present the primary and follow-up results.
UNASSIGNED: All patients who underwent the arthroscopic approach to treat medial and posteromedial corner instability from 2007 to 2017 were included in this report. Overall, 45 patients were included, among which 75.6% were male. The mean age of patients was 32.2 ± 8.4 years. Overall, 44.4% and 15.6% of patients had associated meniscal injuries and chondral lesions, respectively. The mean follow-up duration of patients was 84.2 ± 25.3 months.
UNASSIGNED: Overall, 37 patients developed a full range of motion (82.2%), and most patients (95.6%) showed excellent quadriceps strength (grades 4 and 5). All patients had a normal or 1+ posterior drawer test, Pivot shift test, and Lachman test on physical examination. Moreover, 60% had an associated isolated anterior cruciate ligament injury, 17.8% had an isolated posterior collateral ligament injury, and 17.6% had a combination of more than one ligament injury. One patient developed septic arthritis. Two patients experienced pain, and one pain patient developed pain with a bony spur formation in the medial epicondyle. Three patients showed a 2+ medial collateral ligament (MCL) test (moderate instability) at the final follow-up, all of whom had multi-ligament injuries. All patients, except the three patients who had a failed MCL reconstruction, returned to their previous activities.
UNASSIGNED: This study described a novel arthroscopic treatment of MCL injury, and the results showed acceptable postoperative and clinical outcomes. As the use of minimally invasive surgery may minimize multiple complications associated with open surgery, it is suggested that further studies be conducted regarding this approach when faced with patients who have MCL injuries requiring surgery.

Magnetic resonance imaging (MRI) is increasingly used as an adjunct to spinal soft tissue evaluation in cervical spine (C-spine) trauma; however, the utility of this information remains controversial. In this consecutive observational study, we reviewed the utility of MRI in patients with C-spine trauma.
We identified patients in real time over a 2-year period as they presented to our level 1 trauma center for C-spine computed tomography (CT) scan followed by MRI. MRI was obtained by the trauma team prior to the spine service consultation if (1) they were unable to clear the C-spine according to protocol or (2) if the on-call radiologist reported a concern for ligamentous integrity from the CT findings.
Thirty-three patients, including 19 males (58%) and 14 females, with a mean age of 54 years, were referred to the spine service for concerns of ligamentous instability. The most common mechanisms of injury were motor vehicle accidents (n = 13) and falls (n = 11). MRI demonstrated ligamentous signal change identified by the radiologist as potentially unstable in all patients. Fifteen patients (45%) had multiple C-spine ligaments affected. The interspinous ligament was involved most frequently (28%), followed by the ligamentum flavum (21%) and supraspinous ligament (15%). All patients underwent dynamic upright C-spine X-rays that were interpreted by both the ordering surgeon and radiologist. There was no evidence of instability in any patient; concurrence between X-ray interpretation was 100%. The cervical collar was successfully removed in all cases. No patients required late surgical intervention, and there were no return visits to the emergency department of a spinal nature.
MRI signal change within the ligaments of the C-spine should be interpreted with caution in the setting of trauma. To physicians less familiar with spinal biomechanics, MRI findings may be perceived in an inadvertently alarming manner. Bony alignment and, when indicated, dynamic upright X-rays remain the gold standard for evaluating the ligamentous integrity of the C-spine.

BACKGROUND: The terrible triad described by Hotchkiss in 1996 is a complex lesion of the elbow, following a trauma combining forced valgus and external rotation. It is a lesion that puts the elbow at risk of developing complications such as instability, stiffness, or synostosis of the proximal radio-cubital joint.
METHODS: We report the case of a patient who suffered a closed trauma to the right elbow following a fall onto the palm of the hand with a valgus lateral rotation mechanism. The lesion assessment showed a B2 fracture of the distal humerus (AO classification) with a line splitting the capitulum in the frontal plane, a type 3 coronoid process fracture (Morrey/Odriscoll classification), and a posterolateral elbow dislocation. The surgical treatment followed the same principles as for the terrible triad, with a reconstruction of the lateral column by osteosynthesis of the humeral palate, followed by an internal approach for osteosynthesis of the coronoid process, with the restoration of a stable elbow without laxity in the frontal plane.
CONCLUSIONS: On the basis of the lesion mechanism, column theory, and the schematization of the constituent elements of elbow stability in a ring, certain lesions can be placed in the same box as the terrible triad of the elbow, which also complies with the same therapeutic implications.
CONCLUSIONS: Our observation underlines the possibility of the existence of lesions other than those described by Hotchkiss, which would have the same consequences: an unstable elbow with the risk of evolving into chronic instability or stiffness and whose management accepts the same management.

UNASSIGNED: Ankle fractures result from a wide variety of mechanisms the biomechanics of this articulation make any fracture altering the contact of the articulation surface lead to increased stresses and an inevitable evolution to tibiotalar arthritis.
METHODS: We report the case of a 56-year-old patient admitted for open fracture dislocation of the ankle with a missing medial malleolus. He was treated by external fixation k-wiring and periosteal repair of the deltoid ligament. The one-year follow-up shows a good functional outcome with the patient\'s satisfaction.
UNASSIGNED: In ankle fractures, some authors report no need for fixation of the medial malleolus. Furthermore, the absence of the medial malleolus is not necessarily accompanied by instability of the ankle; however, it inevitably leads to ankle osteoarthritis.
CONCLUSIONS: Our patient admitted for a bimalleolar fracture with missing medial malleolus, as described in the literature, had a favorable evolution with a functional score that was judged fair.

BACKGROUND: Dexmedetomidine (DMED) is frequently used as a sedative in several medical fields. The benefits of DMED include enhanced quality of regional anesthesia, prolonged analgesia, and postoperative opioid-sparing when administered intravenously or perineurally in combination with regional anesthesia. Severe hemodynamic complications, such as profound bradycardia and hypotension, can occur after DMED administration in critically ill patients or overdosage; however, there are few reports of complications with DMED administration following brachial plexus block (BPB).
METHODS: We present two cases of hemodynamic instability that occurred following the initial loading of DMED under supraclavicular BPB. A healthy 29-year-old man without any medical history showed profound bradycardia after receiving a loading dose of DMED 0.9 μg/kg for 9 min. DMED administration was promptly stopped, and after receiving a second dose of atropine, the heart rate recovered. A 62-year-old woman with a history of cardiomyopathy became hypotensive abruptly, requiring the administration of inotrope and vasopressors after receiving a reduced loading dose of 0.5 μg/kg for 10 min. Half of the recommended loading dose of DMED was administered due to the underlying heart dysfunction. Decreased blood pressure was maintained despite the intravenous administration of ephedrine. With continuous infusion of dopamine and norepinephrine, the vital signs were maintained within normal ranges. Inotropic and vasopressor support was required for over 6 h after the initial loading dose of DMED.
CONCLUSIONS: DMED administration following BPB could trigger hemodynamic instability in patients with decreased cardiac function as well as in healthy individuals.

UNASSIGNED: Posterior-stabilized (PS) total knee arthroplasty (TKA) prostheses are characterized by an articulation between the polyethylene tibial post and the cam of the femoral component. Tibial post-fractures, traumatic and non-traumatic, are uncommon but catastrophic complications. We report a rare and unusual case of complete atraumatic erosion of the tibial post after PS-TKA.
UNASSIGNED: We present a case of atraumatic tibial post-failure (complete erosion) in a 73-year-old female after primary TKA. The patient presented with chronic pain, effusion, and instability both in the coronal and sagittal plane over a period of 1 year. There were no signs of component loosening on plain radiography, no fractures, and revealed medial extension laxity on valgus stress views. During revision surgery, polyethylene insert retrieval revealed a completely eroded tibial post, without any obvious fracture. There was no fractured tibial post lying freely in the joint cavity. The patient was subsequently revised with a hinged component due to gross bi-planar instability.
UNASSIGNED: In a post-TKR (PS knee) patient with chronic pain and instability, one should consider tibial post-complications after ruling out infection. Chronic instability can cause progressive erosion of the tibial post, which can fail without an obvious fracture. Revision surgery with constrained implants may be needed to manage such cases.