Total Hip Arthroplasty after Previous Chiari Pelvic Osteotomy-A Retrospective Study of 301 Dysplastic Hips.

Background: Controversy exists whether previous pelvic osteotomies have negative effects on total hip arthroplasty (THA). This study evaluates the implant survival and patient-reported outcomes of THA after previous Chiari pelvic osteotomy (CPO).

Methods: Data on 301 THAs after CPO were collected through clinical and radiological follow-up examinations and telephone interviews.

Expandable distal femur megaprosthesis: A European Musculoskeletal Oncology Society study on 299 cases.

Background And Objectives: Expandable distal femur prostheses have become more popular over the last decades, but scientific data is limited.

Methods: A retrospective study was performed, including cases treated between 1986 and 2019 in 15 European referral centers for bone sarcomas.

Results: A total of 299 cases were included.

Biological Regeneration of Articular Cartilage in an Early Stage of Compartmentalized Osteoarthritis: 12-Month Results.

Background: Biological regeneration in an early stage of osteoarthritis (OA) is an important clinical challenge. An early-stage compartmentalized OA model was used to evaluate different biological regeneration techniques.

Hypothesis: Biological regeneration in an early stage of compartmentalized OA is possible.

Does T2 mapping of the posterior annulus fibrosus indicate the presence of lumbar intervertebral disc herniation? A 3.0 Tesla magnetic resonance study.

Purpose: Indicating lumbar disc herniation via magnetic resonance imaging (MRI) T2 mapping in the posterior annulus fibrosus (AF).

Methods: Sagittal T2 maps of 313 lumbar discs of 64 patients with low back pain were acquired at 3.0 Tesla (3T).

Interaction between living bone particles and rhBMP-2 in large segmental defect healing in the rat femur.

Orthopedic surgeons sometimes combine recombinant, human BMP-2 with autograft bone when dealing with problematic osseous fractures. Although some case reports indicate success with this off-label strategy, there have been no randomized controlled trials. Moreover, a literature search revealed only one pre-clinical study and this was in a cranial defect model.

Climbing Has a Positive Impact on Low Back Pain: A Prospective Randomized Controlled Trial.

Objective: Comparison of climbing versus no treatment to treat chronic low back pain.

Design: Prospective randomized controlled trial.

Setting: Tertiary.

Total Femur Replacement After Tumor Resection: Limb Salvage Usually Achieved But Complications and Failures are Common.

Background: Primary bone or soft tissue tumors of the femur sometimes present with severe and extensive bone destruction, leaving few limb-salvage options other than total femur replacement. However, there are few data available regarding total femur replacement and, in particular, regarding implant failures.

Questions/purposes: We asked: (1) What are the revision-free and overall implant survival rates of conventional total femur replacements in patients treated for sarcoma of the femur or soft tissues? (2) What are the revision-free and overall implant survival rates of expandable total femur replacements in skeletally immature patients? (3) Using the comprehensive International Society of Limb Salvage failure-mode classification, what types of complications occur with conventional and expandable total femur replacements?

Patients And Methods: Our retrospective, single-center cohort study was based on data prospectively collected for 50 patients who received a total femur replacement after tumor resection for indications other than carcinoma or metastatic disease.

Critical-size defect induces unicompartmental osteoarthritis in a stable ovine knee.

Animal models simulating osteoarthritis are frequently associated with irreversible changes in biomechanics. Although these models successfully induce osteoarthritis, results of experimental repair procedures are impaired by biomechanical problems. The aim of this study was to define the critical size of a chondral lesion to induce unicompartmental osteoarthritis in a stable joint.

Electromyographic study of the popliteus muscle in the dynamic stabilization of the posterolateral corner structures of the knee.

Background: The posterolateral corner of the knee consists of static and dynamic stabilizing structures. Knee injuries often include the posterolateral structures. The popliteus muscle-tendon unit is known as the major dynamic stabilizer of the posterolateral corner.