„Subjektive Bewertung von Langzeitergebnissen operativ behandelter Patienten mit Lunatumnekrose (Morbus Kienböck) in unterschiedlichen Stadien“

Von 1990 bis 2002 wurden 65 Patienten mit der Diagnose einer Lunatumnekrose behandelt. Die Ätiologie war in 40 Fällen unklar, in 6 Fällen berufsbedingt und in 19 Fällen war ein Trauma vorangegangen. Eine Radiusverkürzungsosteotomie erfolgte bei 29 Patienten, eine Spongiosaplastik des Os lunatum bei 2, eine Arthroskopie bei 10, eine Denervation nach Wilhelm bei 9, eine Op nach Graner bei 6, eine STT-Arthrodese bei 7, eine Prothesenimplantation und eine Proximal Row Carpectomy bei jeweils einem Patienten. Revisionen erfolgten bei 6 Patienten aufgrund einer Befundprogredienz. Im DASH-Fragebogen zeigte sich das 37% der Patienten eine deutliche Schmerzreduktion erfahren haben. Mit zunehmendem Alter zeigte sich das sich die Ergebnisse der erhobenen Scores verschlechterten. Die Prognose der Lunatumnekrose ist vom Alter und dem Stadium der Erkrankung abhängig. Schlussfolgerungen sind bezüglich der zu wählenden operativen Therapie aufgrund der geringen Fallzahl nur bedingt möglich

Bicompartmental, medial and patellofemoral knee replacement might be able to maintain unloaded knee kinematics

Introduction: Unicompartmental knee arthroplasty (UKA) and total knee arthroplasty (TKA) are standard procedures for treating knee joint arthritis. Neither UKA nor TKA seems to be optimally suited for patients with bicompartmental osteoarthritis that affects only the medial and patellofemoral compartments. A bicompartmental knee arthroplasty (BKA) was designed for this patient group. This study aimed to compare the effectiveness of a BKA and TKA in restoring the kinematics of the knee joint. Materials and methods: In this in vitro study, three types of knee arthroplasties (BKA, posterior cruciate ligament-retaining, and posterior cruciate ligament-resecting TKA) were biomechanically tested in six freshly frozen human cadaveric specimens. Complete three-dimensional kinematics was analyzed for each knee arthroplasty during both passive and loaded conditions in a validated knee kinematics rig. Infrared motion capture cameras and retroreflective markers were used for recording data. Results: No significant differences could be found between the three types of arthroplasties. However, similar kinematic changes between BKA and a native knee joint were documented under passive conditions. However, in a weight-bearing mode, a significant decrease in femoral rotation during the range of motion was found in arthroplasties compared to the native knee, probably caused by contraction of the quadriceps femoris muscle, which leads to a decrease in the anterior translation of the tibia. Conclusions: Kinematics similar to that of the natural knee can be achieved by BKA under passive conditions. However, no functional advantage of BKA over TKA was detected, which suggests that natural knee kinematics cannot be fully imitated by an arthroplasty yet. Further prospective studies are required to determine the anatomic and design factors that might affect the physiologic kinematics.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Peri- and Interprosthetic Femoral Fractures—Current Concepts and New Developments for Internal Fixation

Treatment of peri- and interprosthetic fractures represents a challenge in orthopedic trauma surgery. Multiple factors such as osteoporosis, polymedication and comorbidities impede therapy and the rehabilitation of this difficult fracture entity. This article summarizes current concepts and highlights new developments for the internal fixation of periprosthetic fractures. Since the elderly are unable to follow partial weight bearing, stable solutions are required. Therefore, a high primary stability is necessary. Numerous options, such as new angular stable plate systems with additional options for variable angle screw positioning, already exist and are in the process of being further improved. Lately, individually produced custom-made implants are offering interesting alternatives to treat periprosthetic fractures

LOQTEQ^® VA Periprosthetic Plate—A New Concept for Bicortical Screw Fixation in Periprosthetic Fractures: A Technical Note

Internal fixation using angle stable plates is the treatment standard in periprosthetic fractures around stable implants. To provide instant postoperative full weight-bearing, bicortical screw fixation is advisable but often surgically demanding. This work presents the first clinical results of the LOQTEQ® VA Periprosthetic Plate (aap Implantate AG, Berlin, Germany), a new plate system to simplify screw placement around implants. This plate system uses insertable hinges that allow for variable angle screw anchorage. Data of 26 patients with a mean age of 80 years and a mean follow-up of 13.9 months were retrospectively collected. Patients were clinically and radiologically examined. Bony union was achieved in 14 out of 15 patients with no signs of non-union or implant loosening. One patient, however, presented with implant failure. Clinical scores demonstrated acceptable results. Since the hinge plates are easy to apply, the first results are promising

The prevalence of osteoarthritis: Higher risk after transfemoral amputation?—A database analysis with 1,569 amputees and matched controls

BackgroundSeveral studies have shown that patients with a unilateral amputation have an increased risk of developing osteoarthritis (OA) in the knee of their sound leg. OBJECTIVE: The first objective was to investigate whether amputees are more frequently affected by gon-, cox- or polyarthritis as well as back pain or spinal disorders. We hypothesized that mobile and active transfemoral amputees more often experience OA and spinal disorders than non-amputees. The second objective was to compare the mean age of the patients with OA.PatientsPatients with a unilateral transfemoral amputation (n = 1,569) and five abled-body control groups (each n = 1,569) matched in terms of age and gender resulting in total of 9,414 participants.MethodsGroups were analyzed regarding the prevalence of six selected diagnoses regarding musculoskeletal disorders.ResultsA significantly decreased prevalence of OA and specific disorders of the spine in transfemoral amputees compared to a control group was found. The amputees with OA are significantly younger than patients with OA in the control group.ConclusionThe results from the presented study contradict previously published literature. Apparently circumstances of life play an important role, like physical work and strenuous activities which are likely to be underrepresented in the amputee group. The results of the study need to be used cautiously due to the major limitation of the study which is the lack of detail in individual patients caused by the methodology.</div

Pain course after foot and ankle surgery

Category: Pain managment Introduction/Purpose: Most surgeons believe, that the postoperative pain course after foot and ankle surgery differs from other joints due to the initial protection and immobilization. The knowledge of the normal pain course after foot and ankle surgery is important to know for the surgeon and correctly inform patients preoperative and may help to identify abnormal postoperative healing courses. Methods: 180 patients were enclosed in a prospective study. 66,7% were female and 33.3% were male. All patients had primary surgery for foot and ankle diseases at a tertiary care foot and ankle center. The pain course was measured using a VAS over a one year period. The mean age was 53,2 (±13.6) years. Results: The mean pain level was 4.56 (± 2.0) preoperative. In the first postoperative week it was 3.5 (± 2.18) and declined until the 6th postoperative week to 1.57 (± 1.52) it increased again after the sixth week up to 1.95 (± 1.63) and decreased then again to 1.09 (± 1.51) one year postoperative. The pain level in patient with tendon surgeries tended to be higher in the first 12 weeks postoperative than that of patients with bony procedures. Conclusion: The pain course after Foot and ankle surgery shows a characteristic curve with a significant increase of the pain level after 6 weeks. A comprehensive patient information can increase satisfaction rates of the patient. Any abnormal postoperative pain course should arise suspection of a complicated healing period

Evaluation of anatomical structures after calcaneal Evans- or Hintermann osteotomy

Category: Hindfoot Introduction/Purpose: Both Evans- and Hintermann-osteotomies are commonly used for the treatment of flexible pes planovalgus deformity. The aim of this study was to examine, which anatomical structures are affected by the performed osteotomy. Methods: Two experienced foot and ankle surgeons performed an Evans- or Hintermann-osteotomy on each of 7 cadaver feet (Science Care, Arizona, USA). There were no defects on the preparations. All cadaver feet were prepared in the same way following predetermined preparation guidelines. All individual anatomical structures were prepared and, in particular, peroneal tendons, nervus suralis as well as articular surfaces evaluated. Results: The mean age of the donors was 80.8 years. Eight left and six right feet were prepared. After Hintermann osteotomy there was no damage of the peroneus longus tendon, after evans-osteotomy in one case (14.3%). The peroneus brevis tendon was once totally damaged after Hintermann osteotomy and once partially damaged after evans osteotomy. In one cadaver the suralis nerve was partially damaged after hintermann osteotomy, in no case after evans osteotomy. After Hintermann osteotomy the calcaneal anterior and medial articular surface were 100% and 85.7% intact, whereas after Evans osteotomy only 42.9% and 71.4% were not damaged. The posterior articular surface was affected in no cadaver. Conclusion: After both osteotomies anatomical structures can be damaged. Besides biomechanical advantages, with the Hintermann osteotomy the calcaneal anterior and medial articular surface can be protected in a higher percentage than with the Evans osteotomy. Further studies should be performed, if these findings correlate with the clinical outcome

Cartilage Surgery in Overweight Patients: Clinical and MRI Results after the Autologous Matrix-Induced Chondrogenesis Procedure

Modern orthopaedic surgery provides a variety of techniques for cartilage repair. The Autologous Matrix-Induced Chondrogenesis (AMIC) procedure is a single-step technique with a collagen I/III scaffold for the treatment of full-thickness cartilage lesions. The aim of the study was to analyze the outcome of the AMIC procedure in overweight patients with knee cartilage defects. Overweight patients treated with AMIC surgery were followed up by clinical and MRI examination. 9 patients with a cartilage defect of the knee with a mean lesion size of 2.1±1.2 cm2 and an average body mass index (BMI) of 29.3 were available for the follow-up. The Lysholm Score was significantly improved by the AMIC procedure (38 to 67, p≤0.008). The VAS Score was significantly lower after the procedure (9 to 3, p≤0.018). In the postoperative MOCART Scale, the scaffold reached defect covering of 80%. However, 2 patients had to be revised due to persisting knee pain. The AMIC procedure enhances pain reduction and gain of knee function for cartilage defects of overweight patients. However, in cases of an increased BMI, the patient had to be informed that success rate is reduced despite good defect covering