Assessing Diagnostic Accuracy of Four-dimensional CT for Instable Scapholunate Dissociation: The Prospective ACTION Trial.

Background Timely treatment of scapholunate instability depends on early identification, but current imaging methods are either intricate or fail to demonstrate the dynamic stages. Purpose To calculate the diagnostic accuracy of four-dimensional (4D) CT for diagnosing instable scapholunate ligament (SLL) tears. Materials and Methods This prospective study enrolled consecutive participants with clinically suspected SLL tears who underwent 4D CT from July 2020 to May 2022. A historical study sample diagnosed at cineradiography served as a comparison, and wrist arthroscopy was the reference standard. Scapholunate joints greater than 3 mm were interpreted as instable at index 4D CT and cineradiography. Diagnostic accuracy was expressed as sensitivity and specificity. Areas under the receiver operating characteristic curve and cutoff values for both index tests were calculated. Intraclass correlation coefficients (ICCs) were computed to compare interrater reliability. Effective radiation doses at 4D CT were measured with thermoluminescent dosimeters. Results The study included 40 participants (mean age, 43 years ± 14 [SD]; 24 male) evaluated at 4D CT and 78 patients (mean age, 45 years ± 11; 50 male) historically evaluated at cineradiography. Four-dimensional CT helped detect instable tears in 26 of 35 participants (sensitivity, 74.3% [95% CI: 56.7, 87.5]. Cineradiography revealed instable tears in 52 of 63 patients (sensitivity, 82.5% [95% CI: 70.9, 91]). Four of five participants with stable scapholunate joints were identified at 4D CT (specificity, 80.0% [95% CI: 28.4, 99.5]), and 12 of 15 patients with stable SLLs were identified at cineradiography (specificity, 80.0% [95% CI: 51.9, 95.7]). Interrater agreement of radiologic measurements on 4D CT scans was good to excellent (ICC range, 0.89-0.96). The effective radiation dose ranged from 67 to 72 mSv at the wrist and was less than 1 mSv at the head. Conclusion Four-dimensional CT results are highly reproducible. Instable scapholunate joints greater than 3 mm were detected with a sensitivity of 74.3% and a specificity of 80% in an exploratory trial. Further evidence from larger randomized trials is warranted. German Register for Clinical Trials no. DRKS00021110 (Universal Trial Number U1111-1249-7884) Published under a CC BY 4.0 license. Supplemental material is available for this article. See also the editorial by Demehri and Ibad in this issue.

Intramedullary Single-Kirschner-Wire Fixation in Displaced Fractures of the Fifth Metacarpal Neck (Boxer's Fracture).

The fracture of the fifth metacarpal neck (also called a boxer's fracture) is the most common fracture of the hand1,3. Displaced fractures often result in volar angulation of the metacarpal head, shortening, and residual malrotation4-7. The present video article demonstrates the steps of performing intramedullary single-Kirschner-wire fixation of the fifth metacarpal neck1, with the aim of the procedure being to achieve a closed reduction and internal stabilization of such a fracture. Although many fractures can be treated with a splint only, surgery should be performed in patients with excessive volar angulation, relevant shortening, or rotational deformity5-7. Description: For this procedure, the injured arm of the patient is placed on an arm table. The incision is made 1 to 2 cm longitudinally over the ulnar base of the fifth metacarpal bone. The cortical bone is opened with an awl, and a bent 1.6-mm Kirschner wire is inserted into the medullary canal. After reaching the fracture region, the fracture is anatomically reduced. The Kirschner wire is then advanced into the head of the fifth metacarpal, securing the reduction. Malrotation can be addressed in this stage by rotating the wire under fluoroscopic control. After ensuring anatomical reduction clinically and by fluoroscopy, the wire is shortened under the skin, followed by closure of the incision. We utilize a mid-hand brace for splinting. Alternatives: Nonoperative treatment is common for fifth metacarpal neck fractures in the absence of malrotation, excessive angulation, and shortening. Other surgical techniques include a similar procedure that involves the use of multiple Kirschner wires, plate fixation, transverse Kirschner wire pinning, and, less commonly, retrograde headless screw fixation2,7-9. Rationale: The main advantage of this technique is the preservation of the metacarpophalangeal joint and the minimal soft-tissue damage. Additionally, the use of a single Kirschner wire provides stability at low cost. With some experience, this surgery can be performed within 20 minutes1,9. Expected Outcomes: This procedure provides good fracture reduction and stabilization8. The outcome is usually satisfactory, with very low Disabilities of the Arm, Shoulder, and Hand scores1. Malrotation, angulation, and shortening are sufficiently addressed, and the technique shows the same results as fixation performed with use of 2 intramedullary wires. Important Tips: Bending the Kirschner wire to ensure easy gliding in the medullary canal provides the opportunity to reduce the metacarpal neck once the wire is safely in the head.Aim distally as you open the cortical bone with the awl in order to facilitate the insertion of the Kirschner wire.The primary reduction should be made manually, not by the wire. Subacute fractures and substantially displaced fractures require direct force for a satisfactory reduction, which cannot be achieved by rotation of the wire only.The cortical bone on the metacarpal head is very thin. Take care not to drive the Kirschner wire through the cortical bone and into the joint.Shorten the wire under the skin approximately 1 cm above the bone surface; this ensures easy removal and prevents skin irritation. Acronyms and Abbreviations: K-wire = Kirschner wire.

[Infections of the Hand after Bite Injuries]. / Infektionen an der Hand nach Bissverletzungen.

Bite injuries are common. Along with the resulting complications, they represent approximately 1-2 % of all emergency department visits. In over 75 %, the hands are affected. In Northern Europe, bites and subsequent infections are mainly caused by dogs and cats but also by humans.Up to 40 % of all hand infections are caused to bite injuries. Due to the multiple and complex compartments as well as the low soft tissue coverage of functionally relevant structures, even the smallest and most superficial bite injuries of the hand lead to infections. Any bite injury to the hand may subsequently may result in a fulminant infection and, rarely, even death.The spectrum of pathogens from the oral flora of the biting animal or person is diverse and includes aerobic and anaerobic bacterial strains. Bite injuries represent a major challenge for both the injured person and the attending physician. The rate of complications has been shown to increase with delayed medical consultation, lack of medical care and inadequate wound care. In this review, we discuss the types and complications of bite wounds, their potential risk of infection, their pathogen spectrum and appearance, and their effective treatment.

[Input of the start on the result of a special interdisciplinary rehabilitation program for work-related injuries of the hand]. / Einfluss des Beginns auf das Ergebnis einer spezialisierten Handrehabilitation bei beruflichen Handverletzungen.

PURPOSE: The objective of this study was to evaluate the outcome of a special interdisciplinary hand therapy program depending on the time interval between trauma and rehabilitation. PATIENTS AND METHODS: With use of self-assessed scores (Disability of the Arm, Shoulder and Hand Score [DASH-Score], European Quality of Life 5 Dimensions [EQ-5D]) and objective functional parameters (TAM = Total Active Motion for finger injuries, ROM = Range of Motion for wrist injuries, grip strength) the outcome of 76 patients with injuries of the fingers, wrist or a complex regional pain syndrome (CRPS) was analysed at the begin and end of an inpatient rehabilitation and at a follow-up examination after 12 to 16 weeks. The patients were divided into groups with an early (< 120 days after trauma) or late beginning of their rehabilitation. RESULTS: At the follow-up examination early beginners had a significant better DASH-Score as well as a ROM. At the end of the rehabilitation program and at the time of the follow-up examination significant more patients with an early as patients with a late start of the rehabilitation were back to work. Especially patients with CRPS and finger injuries benefit from an early start of the rehabilitation. CONCLUSION: Compared to a late start an early start of a rehabilitation program after finger and hand injuries and a CRPS leads to better functional with special benefit for patients with a CRPS.

ACTION trial: a prospective study on diagnostic Accuracy of 4D CT for diagnosing Instable ScaphOlunate DissociatioN.

BACKGROUND: Early detection of scapholunate ligament (SLL) tears is essential after minor and major trauma to the wrist. The differentiation between stable and instable injuries determines therapeutic measures which aim to prevent osteoarthritis. Arthroscopy has since been the diagnostic gold standard in suspected SLL tears because non-invasive methods have failed to exclude instable injuries reliably. This prospective study aims to determine the diagnostic accuracy of dynamic, 4D computed tomography (CT) of the wrist for diagnosing instable SLL tears. METHODS: Single center, prospective trial including 40 patients with suspected SLL tears scheduled for arthroscopy. Diagnostic accuracy of 4D CT will be tested against the reference standard arthroscopy. Radiologists will be blinded to the results of arthroscopy and hand surgeons to radiological reports. A historical cohort of 80 patients which was diagnosed using cineradiography before implementation of 4D CT at the study site will serve as a comparative group. DISCUSSION: Static imaging lacks the ability to detect instable SLL tears after wrist trauma. Dynamic methods such as cineradiography and dynamic magnetic resonance imaging (MRI) are complex and require specific technical infrastructure in specialized centers. Modern super-fast dual source CT scanners are gaining popularity and are being installed gradually in hospitals and ambulances. These scanners enable dynamic imaging in a quick and simple manner. Establishment of dynamic 4D CT of the wrist in patients with suspected SLL tears in in- and outpatient settings could improve early detection rates. Reliable identification of instable injuries through 4D CT scans might reduce the number of unnecessary diagnostic arthroscopies in the future. TRIAL REGISTRATION: This study was registered prospectively at the German Clinical Trials Register (DRKS) DRKS00021110 . Universal Trial Number (WHO-UTN): U1111-1249-7884.

Ulnocarpal impaction syndrome: treatment with a transverse ulnar shortening osteotomy from an ulnodorsal approach.

INTRODUCTION: Ulnocarpal impaction syndrome is a common cause of chronic ulnar-sided wrist pain. The distal ulnar shortening osteotomy addresses the often present positive ulnar variance and therefore relieves the excessive load on the ulnocarpal joint. In the present study, the results of a technique that uses an ulnodorsal approach with a compression device and a transverse osteotomy are presented and compared to other techniques. MATERIALS AND METHODS: This retrospective study includes 92 wrists with an ulnocarpal impaction syndrome, which were treated with an ulnar shortening osteotomy. The mean duration of postoperative follow-up was 50 months. RESULTS: The mean ulnar variance was 2.17 ± 1.56 mm preoperatively and after the ulnar shortening osteotomy -1.36 ± 1.67 mm (p < 0.05). Radiological consolidation of the osteotomy could be shown in 91 wrists 6 months postoperatively. Patients rated the preoperative pain level at a VAS 7.9 ± 1.7 which decreased to a of VAS 2.4 ± 2.5 (p < 0.05). 19 patients complained of mechanical irritation. There was no neurological irritation. CONCLUSION: It could be shown that the distal ulnar shortening osteotomy by a transverse osteotomy using a compression device and an ulnodorsal approach has a low complication rate. It is comparable to the oblique osteotomy in effectiveness and safety.