Torque acting on biodegradable magnesium screws during intramedullary insertion into a metacarpal bone - a biomechanical study.

Recently, biodegradable implants made from magnesium (Mg) alloys have been developed to obviate the need for later implant removal. Mg-based cannulated compression screws (CCS) are ideal for intramedullary screw (IMS) fixation of metacarpal fractures. The present study aimed at investigating the torque acting on Mg-based CCS at failure and at intramedullary metacarpal insertion. The devices were CE certified Magnezix 2.7 and 3.2 mm CCSs (Syntellix®, Hannover, Germany). Torque at failure was measured in a synthetic bone model using a standardized polyurethane foam block. In a second assessment, insertional torque was measured in ten cadaveric metacarpal bones. Mean torque at failure for the 2.7 mm and 3.2 mm CCSs was 42.8 Ncm (±1.9 Ncm) and 63.0 Ncm (±2.2 Ncm), respectively. In the human cadaver model, the torque distribution curve at metacarpal insertion showed three peaks. The highest reached 53.6% of the lowest torque at failure measured in the synthetic bone model for the 3.2 CCS (31.4 vs. 58.6 Ncm). The mean difference between peak torque at metacarpal insertion and torque at failure was 38.3 Ncm (99% CI [33.6, 43.0 Ncm], p < 0.0001). In terms of torque load, Mg-based CCSs are suitable for IMS fixation of metacarpal fractures. Biodegradable implants may represent an important improvement of this treatment method; confirmation by in-vivo studies is needed.

Intramedullary screw fixation of metacarpal and phalangeal fractures - A systematic review of 837 patients.

Intramedullary screw (IMS) fixation is increasingly used as an alternative treatment option in metacarpal and phalangeal fractures of the hand. However, this technique is currently the subject of controversy among hand surgeons. The aim of this systematic review was to gain insight on radiological, functional and patient-rated outcomes reported in literature. A comprehensive literature search of PubMed, Embase, CENTRAL and CINAHL databases was conducted on March 1st, 2021. All studies reporting on fracture union, complications, and functional and patient-rated outcome in IMS fixation of metacarpal and/or phalangeal fractures were selected. Two prospective and 16 retrospective cohort studies were included, encompassing a total of 837 patients with 958 fractures (693 metacarpal, 222 proximal phalangeal and 43 middle phalangeal). Mean surgery duration was 26.4 min (range 5-60 min). Union was ultimately achieved in all fractures in a mean of 5.7 weeks (range 2-12 weeks). The procedure-related complication rate was 3.2%. The most frequently reported complication was limitation of joint motion, occurring in 2.0% of cases. Incidence of other complications, including loss of reduction, infection and screw protrusion did not exceed 1%. Overall mean total active motion averaged 243° and grip strength reached 97.5% of the contralateral side. The Disabilities of the Arm, Shoulder and Hand (DASH) score averaged 3.7 points. Duration of sick leave was 7.3 weeks. According to the findings of this systematic review, IMS fixation is a time-saving and safe minimally invasive solution for both metacarpal and phalangeal fractures, with a low rate of complications and promising functional and patient-rated results.

Ulnar Variance in Scaphoid Fractures: Retrospective Analysis of 182 Cases.

BACKGROUND: Literature provides little and controversial evidence regarding the influence of ulnar variance (UV) on the incidence of scaphoid fractures. The aim of this retrospective study was to assess UV in a large number of patients with acute scaphoid fracture in comparison to a control group of the same population. METHODS: During a two year period, 182 patients with acute scaphoid fractures (fracture group) and 182 ethnicity-, gender- and age-matched patients with wrist contusions (control group) were treated in three non-university hospitals. Using standardized digital wrist radiographs, UV values were measured by means of the method of perpendiculars by two independent examiners. The UV values of the fracture group were then compared to the UV values of the control group. RESULTS: Analyses of the agreement between the two raters resulted in a good to excellent inter-item correlation of 0.89, with a high intra-class coefficient of 0.93 (95% confidence interval: 0.87-0.95). Mean (SD) UV value was -0.82 mm (1.77) in the fracture group and 0.27 mm (1.44) in the control group. Paired sample t-test showed a significant difference between the two groups (p < 0.0001). CONCLUSIONS: According to this study, patients with scaphoid fractures are significantly more likely to show a negative UV than matched patients with wrist contusions.

Lucerne cast - LuCa: Functional conservative treatment of extra-articular fractures of the proximal phalanges of the fingers (with video).

Most extra-articular fractures of the proximal phalanges (P1) of the triphalangeal fingers can be treated conservatively with good results. Prerequisites for successful fracture treatment are intact soft tissue without any lesions of the extensor hood and stable initial fracture reduction. The key to functional conservative treatment of P1 fractures is to immobilize the metacarpophalangeal joints in flexion, resulting in equilibrium of flexor and extensor forces across the fracture site, which converts these inherently unstable fractures into relatively stable fractures. Precise initial application of the cast and regular follow-up of the patient is essential for successful treatment. By means of an instructional video, an overview of the equipment required is given, and the correct application of a Lucerne Cast is illustrated step-by-step.

[Treatment of an osteo-fascio-cutaneous defect of the femur with a serial connected flow-through free-flap]. / Therapie eines osteo-fascio-cutanen Femurdefektes mit in Reihe geschalteter Durchflusslappenplastik.

Covering large osteo-fascio-cutaneous defects after debridement often calls for elaborate soft tissue reconstruction. Large tissue loss or structural damage that requires distinct repair is rarely coverable by a single conventional flap. Here, we report the case of serial flap coverage using sequentially connected fibular and latissimus dorsi free flaps.

[An immobilising malignant phyllodes tumour of the breast]. / Immobilisierendes malignes Cystosarcoma phylloides der Brust.

Phyllodes tumours of the breast are rare occurrences, but they can reach huge dimensions. Descriptions of tumours whereby the women are immobilised as a consequence of the size of the tumour, are hard to find in the literature. In this presentation we show a case of a woman in otherwise healthy condition with a giant phyllodes tumour of her left breast. Because of the weight of the tumour, the patient could not leave her bed for more than 6 months.

[Long-term outcome after surgical treatment of breast asymmetry: analysis of the patient's perspective in 51 cases]. / Langzeitresultate nach chirurgischer Behandlung von Brustasymmetrien aus Sicht der Patientinnen: Eine Analyse von 51 Fällen.

INTRODUCTION: Literature provides 3 studies only investigating the long-term outcome after surgical correction of breast asymmetry. The goal of this study was to analyse from a patient's perspective, which factors influence postoperative satisfaction most. PATIENTS AND METHODS: All patients undergoing surgical treatment for breast asymmetry between 2000 and 2009 were included. With help of the visual analogue scale the patients conducted a subjective assessment of their own long-term result using the following parameters: overall satisfaction, symmetry, size, shape, scarring and sensitivity. Anthropometric measurements of the breasts followed. RESULTS: 51 patients (80% follow-up) were seen 2-11 (mean 5±2.5) years postoperatively. The following mean values were recorded for overall satisfaction 8.31 (±1.91), symmetry 7.86 (±2.25), size 8.42 (±1.93), shape 8.12 (±2.03), scarring 7.82 (±1.94) and sensitivity 7.92 (±2.19). Overall satisfaction increased significantly with good scores for the parameters symmetry [p=0.01] and shape [p=0.048]. Neither size [p=0.46] nor scarring [p=0.69] nor sensitivity [p=0.34] had a statistically significant influence on overall satisfaction. Furthermore, overall satisfaction did not depend on the surgical technique, preoperative size, preoperative asymmetry, age of the patient at time of surgery, period of time between the operation and the assessment, resected weight (absolute and difference between left and right) or on postoperative symmetry of the nipple areola complex. CONCLUSION: In our patients, long-term overall satisfaction after surgical correction of breast asymmetry was primarily dependent on symmetry and shape. Size, scarring and sensitivity did not have a statistically significant influence on postoperative overall satisfaction. This also applied to preoperative size, preoperative extent of asymmetry, age of the patient at time of surgery, surgical technique and the time span between the operation and the assessment.

[The interesting case: unilateral hypoplasia of the breast in Becker nevus syndrome]. / Der interessante Fall: einseitige Hypoplasie der Brust bei Becker Nävus Syndrom.

The Becker nevus syndrome is defined by the association of a Becker's nevus with ipsilateral breast hypoplasia and/or musculoskeletal disorders. There are only a few dozen case reports in the literature. We here present the case of a 20-year-old female patient who was treated in our clinic due to a breast asymmetry.

Semi-occlusive dressing for the treatment of fingertip amputations with exposed bone: quantity and quality of soft-tissue regeneration.

Nineteen fingertip amputations with exposed bone were treated with a semi-occlusive dressing. The quantity and quality of the regenerated soft tissue was examined. In all 19 fingers there was sufficient uncomplicated healing such that secondary surgical procedures were not needed. At follow-up 6-18 months after the injury, soft tissue thickness around the bone of the distal phalanx measured 6.0 mm (SD 1.6) on the palmar aspect (opposite side 7.0 mm (SD 0.8)) and 4.2 mm (SD 1.7) distally (opposite side 4.5 mm (SD 0.8)). The two-point discrimination was 4 mm (SD 2) (opposite side 3 mm (SD 1)). The skin healed almost without scarring and the dermal ridges reformed. The regeneration of the soft tissue thickness to almost 90% of its former extent is higher than we expected.

[One-stage reconstruction of facial defects after tumor resection with the Integra system]. / Integra zur einzeitigen Defektdeckung nach Tumorresektion im Gesichtsbereich.

BACKGROUND: In 2010 excellent aesthetic results after basal cell carcinoma excision and one-stage coverage with Integra without split thickness skin graft (STSG) were published in a series of 10 Asian patients. Our aim in this study was to verify these results in a series of Caucasian patients and evaluate this procedure as a possible new standard. PATIENTS AND METHODS: 6 patients with facial basal cell carcinoma were treated by regular excision with 3 mm safety margins and one-stage coverage with Integra without STSG, followed by a clinical evaluation and fotodocumentation. RESULTS: In 3 patients local infection occurred with a complete loss of the Integra. 2 out of these 3 patients showed an unaesthetic scar and are considering another surgical approach for correction. The other 3 patients had an uneventful course, unfortunately 2 out of these patients (67%) developed an unaesthetic scar as well and are also considering surgical correction. CONCLUSION: Because of aesthetically unsatisfactory results and high infection rates we abandoned this procedure after 6 patients only. Our standard remains excision with 3 mm safety margins, histological analysis and one-stage repair with local facial flaps.

Extra-articular fractures of the proximal phalanges of the fingers: a comparison of 2 methods of functional, conservative treatment.

PURPOSE: For nonsurgical treatment of fractures of the proximal phalanges of the triphalangeal fingers, different dynamic casts have been described. The main principle behind these casts is advancement and tightening of the extensor hood, caused by a combination of blocking the metacarpophalangeal joints in flexion and actively flexing the proximal interphalangeal joints. In contrast to established treatment protocols using functional forearm casts, the Lucerne cast allows for free mobilization of the wrist joint. The purpose of the current multicenter study was to compare the results of conservative, functional treatment using 2 different methods, either a forearm cast or a Lucerne cast. METHODS: Over a 2-year-period, a prospective, randomized, multicenter study was conducted at 4 hospitals in Switzerland. Clinical and radiological results of 66 consecutive patients having 75 extra-articular fractures of the proximal phalanges were recorded through a minimum follow-up of 3 months. Intra-articular and physeal fractures, pathological fractures, open fractures, concomitant injuries of the tendons or collateral ligaments, and accidents more than 7 days before presentation were excluded from the study. RESULTS: Radiographically, there were no statistically significant differences between the 2 groups in terms of palmar apex angulation and radial or ulnar angulation. There were no differences in total active range of finger motion. Wrist joint motion at the time of cast removal was statistically superior in patients treated with Lucerne cast. However, there were no significant differences in wrist joint motion at 12 weeks of follow-up. CONCLUSIONS: The clinical and radiological results achieved with the Lucerne cast are comparable to those of established treatment. Well-reduced, minimally angulated, or nonangulated fractures of the proximal phalanges of the fingers can be effectively treated using functional casts without immobilizing the wrist. TYPE OF STUDY/LEVEL OF EVIDENCE: Therapeutic II.

[Piezoelectric osteotomy in hand surgery: the autologous osteocartilage transplantation for joint reconstruction]. / Piezoelektrische Osteotomie in der Handchirurgie: autologe osteokartilaginäre Transplantation zur Gelenksrekonstruktion.

This article demonstrates the use of this piezoelectricsurgical device during an autologous osteocartilage transplantation in which the head of the phalanx of a finger is reconstructed from part of the phalanx condyle of a toe.

[Glomangiomatosis on the hand. A case report]. / Glomangiomatose der Hand. Ein Fallbericht.

Glomus tumours are solitary benign lesions most frequently located subungually on fingers and toes. In the rare case of a glomangiomatosis, the typical glomus cells are found on the altered vessel wall of the angiomatosis. Due to the rarity of this disease, no therapeutic golden standard has been mentioned in the literature, and a conservative treatment is usually adopted. The case of a 20-year-old craftsman with congenital, painful glomangiomatosis on his left dominant hand, progressively limiting the functionality of this limb, is reported. Two years after unsuccessful partial tumour resection, a surgical treatment based on radical tumour resection in terms of a finger amputation was performed. The 1-year follow-up showed no signs of pain for the patient.

[Long-term follow-up after surgery for thoracic outlet syndrome (TOS)]. / Langzeitresultate nach operativer Therapie bei Thoracic-outlet-Syndrom (TOS).

This is a long-term follow-up analysis of patients who have been operated on for Thoracic Outlet Syndrome (TOS) at our clinic in order to evaluate the quality of therapy and the criteria of indications for surgery. 39 patients with a total of 45 surgical procedures were examined after a median follow-up of 8.8 years. The results in this study are based exclusively on the subjective outcome assessment by the patients themselves. Assessment of the long-term result in the "vascular TOS" group (13 cases = 29 %) was good in ten cases (77 %), fair in two cases (15 %) and poor in one case (8 %). In agreement with the literature, we were able to achieve the best results in this group. In the "true neurological TOS" group (28 cases = 62 %), assessment of the long-term result was good in 19 cases (68 %), fair in six cases (21 %) and poor in three cases (11 %). A clear tendency to a poor prognosis could be seen in women with a combination of cervical rib and fibrous band and a long delay between onset of symptoms and surgery. Assessment of long-term result in the "disputed TOS" group (four cases = 9 %) showed good results in three cases and a fair result in one case. In the absence of objective pathologies, only few and carefully selected patients were operated upon. The presented long-term results confirm the use of individual therapeutic concepts with special consideration of anatomy and clinical picture.

["True neurologic thoracic outlet syndrome" -- anatomical features and electrophysiological long-term follow-up of lateral thenar atrophy]. / "True Neurologic Thoracic Outlet Syndrome" -- Anatomie und elektrophysiologischer Langzeitverlauf bei lateraler Thenaratrophie.

Atrophies of the intrinsic muscles of the hand are considered to be a typical symptom of the "true neurologic" form of thoracic outlet syndrome (TOS). The classical form of this entity was described as early as 1970, consisting of a cervical rib or a prolonged transverse process of C7, complete with a fibrous band to the first thoracic rib, resulting in atrophy of the intrinsic muscles of the hand. All our TOS patients presenting with such atrophy displayed anatomical findings consistent with this definition. Based on this observation, the TOS classification currently in clinical use, which differentiates between "disputed" and "true neurologic" subgroups of the neurologic form, is reviewed. In all cases of "true neurologic TOS" with atrophy of the intrinsic muscles of the hand, the lateral thenar muscles are affected first. We present the electrophysiological long-term results of such thenar atrophies of seven patients with eight operated extremities after brachial plexus decompression. The amplitude of the neurographically measured potential over the opponens pollicis and the abductor pollicis brevis muscle, respectively, was defined as quantitative parameter for muscles atrophy. Neither distinct reinnervation nor progressive denervation was evident in any of the cases after a follow-up period, on average, of more than five years post surgery. These findings are in conflict with clinical observations reporting a major postoperative improvement of the motor deficits.

Cervical outlet syndrome due to an accessory part of the trapezius muscle in the posterior triangle of the neck.

A 48-year-old man presented with pain and sensory impairment radiating from the neck to the thumb and forefinger of the right hand when lifting weights and turning or tilting the head. The symptoms were due to an anomalous accessory part of the trapezius muscle crossing the upper part of the brachial plexus. Excision of the anomalous muscle and release of the clavicular part of the sternocleidomastoid muscle abolished the complaints.