The purpose of this study was to determine the benefits and risks of humeral lengthening procedures. Distraction osteogenesis was performed in 19 humeri on 16 patients (9 males, 7 females). The mean age at the time of lengthening was 11.5 years (range 3-24 years) and average follow-up was 8.7 years (range 2-21 years). Etiologies for short humeri included infection in six patients, congenital anomaly in six patients, unicameral bone cysts involving the physis in five patients, and posttraumatic growth disturbance in two patients. The average lengthening was 5 cm. The benefits from humeral lengthening include increased performance in daily activities, improved sports performance, and significantly better self-image. Complications included temporary radial nerve palsy in three cases, drainage from the pin tracts in two cases, elbow flexion contracture in three cases, and late humerus fracture in two cases. All the complications resolved over time and did not affect the outcome. Eleven lengthening procedures were not associated with any complications. Although the humerus is surrounded by complex neurovascular structures and muscles, humerus lengthening provided satisfactory results with temporary minor complications.
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http://dx.doi.org/10.1097/01.bpo.0000164868.97060.bb | DOI Listing |
Zhongguo Gu Shang
December 2024
Department of Orthopaedics, Jiangyan Hospital of Traditional Chinese Medicine, Taizhou 225599, Jiangsu, China.
Objective: To explore changes of humerus torque screw tip distance on stability of proximal humeral internal locking system (PHILOS) by finite element analysis, in order to provide reference for selection of intraoperative plant size.
Methods: The proximal humerus 3D model was constructed based on Synbone artificial bone model in 3D engineering drawing software, and the corresponding 3D model was constructed based on PHILOS bone plate contour. The model was modified to simulate comminuted proximal humerus fracture, and the operation model was simulated after fracture, and the fixed operation model was assembled, the apex distance of humerus moment screw was set as 4, 8, 12 and 16 mm respectively.
Sports Health
October 2024
Strength Training Study and Research Group, Institute of Health Sciences, Paulista University, São Paulo, São Paulo, Brazil.
Background: The regional hypertrophy response of elbow flexor muscles was compared after unilateral elbow flexion training in extended versus flexed shoulder position under vascular occlusion, which can induce muscle hypertrophy in the absence of muscle damage-induced edema/swelling.
Hypothesis: Hypertrophy of elbow flexor muscles would be greater in extended compared with flexed shoulder position.
Study Design: Randomized within-subject trial.
J Shoulder Elbow Surg
October 2024
Department of Orthopaedics, University of Utah, Salt Lake City, UT, USA; Department of Biomedical Engineering, University of Utah, Salt Lake City, UT, USA; Department of Mechanical Engineering, University of Utah, Salt Lake City, UT, USA. Electronic address:
Background: Humeral distalization is inherent to reverse total shoulder arthroplasty (rTSA) and is often produced with concomitant humeral lateralization via the level of the humeral head cut, implant positioning, implant neck shaft angle, and polymer insert thickness. Biomechanical data on the isolated effects of humeral distalization remain limited but could be important to consider when optimizing postoperative rTSA shoulder function. This study investigated the effects of isolated humeral distalization on shoulder biomechanics using a biorobotic shoulder simulator.
View Article and Find Full Text PDFSICOT J
October 2024
Department of Orthopaedic Oncology, IRCCS Istituto Ortopedico Rizzoli, Via Pupilli 1, Bologna 40136, Italy.
Introduction: Limb salvage surgery in children following bone sarcoma resection is a challenging problem because of the small size of the bones, the lack of appropriate size-matched implants, and the risk of limb-length discrepancy once skeletal growth is complete, secondary to the loss of the epiphyseal plate. Although several reconstruction options are available in children with bone sarcomas, such as vascularized fibula, massive bone allograft, extracorporeal devitalized autograft, endoprosthesis, and allograft-prosthesis composite, a consensus has not been reached on the best reconstruction method. The purpose of the present study is to propose an algorithm for reconstruction after resection of bone sarcomas in children.
View Article and Find Full Text PDFBone Joint J
October 2024
AutoRSA Research Group, Orthopaedic Research Unit, Aarhus University Hospital, Aarhus, Denmark.
Aims: The aim of this study was to evaluate the kinematics of the elbow following increasing length of the radius with implantation of radial head arthroplasties (RHAs) using dynamic radiostereometry (dRSA).
Methods: Eight human donor arms were examined by dRSA during motor-controlled flexion and extension of the elbow with the forearm in an unloaded neutral position, and in pronation and supination with and without a 10 N valgus or varus load, respectively. The elbows were examined before and after RHA with stem lengths of anatomical size, + 2 mm, and + 4 mm.
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