Metallosis is commonly associated with magnetically controlled growing rods; results from an independent multicentre explant database.

Purpose: Determine the incidence of metallosis around MAGEC rods.

Methods: A multicentre explant database was searched to identify cases with complete intraoperative findings at rod removal. Surgeons removing rods detailed the presence or absence of tissue metallosis associated with rods.

The NuVasive MAGEC Rod Urgent Field Safety Notice Concerning Locking Pin Fracture: How Does Data From an Independent Explant Center Compare?

Study Design: Analysis of explanted MAGnetic Expansion Control (MAGEC) growing rods.

Objective: The aim of this study was to quantify the rate of locking pin breakage in explanted MAGEC rods and compare with the manufacturer's data.

Summary Of Background Data: On June 25, 2019, NuVasive released an Urgent Field Safety Notice stating that MAGEC rods manufactured before March 26, 2015 had a higher than expected locking pin breakage rate of 5%.

Wear behaviour of polyethylene glenoid inserts against PyroCarbon humeral heads in shoulder arthroplasties.

The generation of polyethylene wear debris, and the subsequent tissue reaction to such debris is considered to be a limitation in the long-term survival of shoulder arthroplasties. The purpose of this study was to investigate, for the first time, the wear of a novel PyroCarbon-on-Polyethylene (PyCoP) shoulder arthroplasty system. A 5 million cycle wear test was performed on PyroCarbon humeral heads, which were articulated against commercially available polyethylene glenoid insert components to form an anatomic total shoulder arthroplasty (aTSA).

Spinal Lengthening With Magnetically Controlled Growing Rods: Data From the Largest Series of Explanted Devices.

Study Design: Laboratory analysis of explanted MAGnetic Expansion Control (MAGEC) rods.

Objective: The aim of this study was to identify the in vivo lengthening of MAGEC rods.

Summary Of Background Data: Little data is available regarding the lengthening achieved by MAGEC rods.

Hip simulator testing of the taper-trunnion junction and bearing surfaces of contemporary metal-on-cross-linked-polyethylene hip prostheses.

Adverse reaction to metal debris released from the taper-trunnion junction of modular metal-on-polyethylene (MoP) total hip replacements (THRs) is an issue of contemporary concern. Therefore, a hip simulator was used to investigate material loss, if any, at both the articulating and taper-trunnion surfaces of five 32-mm metal-on-cross-linked-polyethylene THRs for 5 million cycles (Mc) with a sixth joint serving as a dynamically loaded soak control. Commercially available cobalt-chromium-molybdenum femoral heads articulating against cross-linked polyethylene (XLPE) acetabular liners were mounted on 12/14 titanium (Ti6Al4V) trunnions.

The effect of combined loading cycles on the wear of reverse shoulder joint replacements.

Wear of polyethylene is a current limitation in the long-term survival of reverse shoulder arthroplasties (RSAs). The purpose of this study was to investigate, for the first time, the influence of a combination of clinically relevant activities of daily living (ADLs) as patterns of motion and loading on the wear of ultra-high molecular-weight polyethylene (UHMWPE) in RSA. This physiological combined cycle, termed "repeated-motion-load", was applied on four new samples of a commercially available reverse shoulder prosthesis for five million cycles using the unique Newcastle Shoulder Wear Simulator.

Wear at the taper-trunnion junction of contemporary ceramic-on-ceramic hips shown in a multistation hip simulator.

Ceramic-on-ceramic (CoC) total hip replacements (THR) have a substantially lower wear rate than metal-on-polyethylene (MoP) hips, as shown by hip simulator testing. However, the revision rates of CoC and MoP hips are comparable. To try and explain this discrepancy the wear, at both the bearing surfaces and taper-trunnion interface of 36 mm BIOLOXdelta CoC THRs, mounted on 12/14 titanium (Ti6Al4V) trunnions was investigated using a hip simulator (n = 3) and a dynamically loaded CoC sample in a separate test station.

Force Testing of Explanted Magnetically Controlled Growing Rods.

Study Design: Laboratory analysis of explanted MAGnetic Expansion Control (MAGEC) growing rods.

Objective: The aim of this study was to measure the force produced by explanted MAGEC rods compared with new rods and assess the influence of clinical variables.

Summary Of Background Data: MAGEC rods are increasingly used in early-onset scoliosis.

Analysis of Explanted Magnetically Controlled Growing Rods From Seven UK Spinal Centers.

Study Design: Analysis of explanted MAGnetic Expansion Control (MAGEC) growing rods.

Objective: To analyze explanted MAGEC rods used in management of early onset scoliosis and identify the mode of failure in such cases.

Summary Of Background Data: Magnetically controlled growing rods are increasingly used as the option of choice for early onset scoliosis.

Engineering of a multi-station shoulder simulator.

This work aimed to engineer a multi-station shoulder simulator in order to wear test shoulder prostheses using recognized shoulder activities of daily living. A bespoke simulator was designed, built and subject to commissioning trials before a first wear test was conducted. Five JRI Orthopaedics Reverse Shoulder VAIOS 42 mm prostheses were tested for 2.

Preoperative staging accuracy of multidetector computed tomography in pancreatic head adenocarcinoma.

Objective: To compare the preoperative computed tomography (CT) findings in patients with potentially operable pancreatic malignancy with findings at surgery.

Methods: In a retrospective analysis, 140 consecutive patients with carcinoma of the pancreatic head were studied. All were imaged using a standardized multidetector CT (MDCT) protocol.

Does moderate celiac axis stenosis identified on preoperative multidetector computed tomographic angiography predict an increased risk of complications after pancreaticoduodenectomy for malignant pancreatic tumors?

Objectives: To identify any association between celiac artery compromise found on computed tomographic angiography and the incidence of postoperative and perioperative complications.

Methods: The computed tomographic angiograms of 36 patients who underwent the Whipple procedure for pancreatic adenocarcinoma were examined retrospectively. The association between the results and surgical course was investigated.