The Haleem–Marks–Botchu classification: a novel CT-based classification for intracanal rib head penetration

2021 ◽  
Author(s):  
S. Haleem ◽  
M. Malik ◽  
C. Azzopardi ◽  
R. Botchu ◽  
D. S. Marks
Keyword(s):  
Head Penetration ◽  
Rib Head

Standing versus Supine Radiographs in RSA Evaluation of Femoral Head Penetration

2006 ◽  
Vol 448 ◽  
pp. 46-51 ◽  
Author(s):  
Charles R Bragdon ◽  
Jonas Thanner ◽  
Meridith E Greene ◽  
Henrik Malchau ◽  
Georgios Digas ◽  
...  
Keyword(s):  
Femoral Head ◽  
Head Penetration ◽  
Femoral Head Penetration

Comparison of Polyethylene Wear between Highly Crosslinked and Annealed UHMWPE and Conventional UHMWPE against Ceramic Heads in Total Hip Arthroplasty

2012 ◽  
Vol 529-530 ◽  
pp. 279-284 ◽  
Author(s):  
Taishi Sato ◽  
Yasuharu Nakashima ◽  
Mio Akiyama ◽  
Takuaki Yamamoto ◽  
Taro Mawatari ◽  
...  
Keyword(s):  
Femoral Head ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Polyethylene Wear ◽  
Wear Rates ◽  
Head Penetration ◽  
Total Hip ◽  
Patient Demographics ◽  
Ceramic Femoral Head ◽  
Implantation Period

The purpose of this study was to examine the effects of ceramic femoral head material on the wear of annealed, crosslinked ultra-high molecular weight polyethylene (UHMWPE) (XLPE) in total hip arthroplasty compared to non-crosslinked conventional UHMWPE (CPE). XLPE was fabricated by crosslinking with 60 kGy irradiation and annealing. Femoral heads made from zirconia and alumina ceramics, and cobalt-chrome (CoCr) of 22 mm or 26 mm diameter were used. In this study, the femoral head penetration into the cup was measured digitally on radiographs of 70 hips with XLPE and 50 hips with CPE. The average follow-up periods were 6.1 and 12.7 years, respectively. The steady wear rate of XLPE was significantly lower than those of CPE (0.002 versus 0.08 mm/year, respectively). Zirconia displayed increased wear rates compared to alumina in CPE; however, there was no difference among head materials in XLPE (0.0028, 0.011 and 0.009 mm/year for zirconia, alumina and CoCr, respectively). Neither head size or implantation period impacted XLPE wear. In contrast to CPE, XLPE displayed low wear rates surpassing the effects of varying femoral head material, size, implantation period and patient demographics.

scholarly journals Post-traumatic thoracic scoliosis with rib head dislocation and intrusion into the spinal canal: a case report and review of literature

2010 ◽  
Vol 19 (S2) ◽  
pp. 183-186 ◽  
Author(s):  
Thomas J. Kishen ◽  
Bibhudendu Mohapatra ◽  
Ashish D. Diwan ◽  
Greg Etherington
Keyword(s):  
Case Report ◽  
Spinal Canal ◽  
Review Of Literature ◽  
Thoracic Scoliosis ◽  
Post Traumatic ◽  
Rib Head

scholarly journals The Ringloc liner compared with the Hexloc liner in total hip arthroplasty

2009 ◽  
Vol 1 (1) ◽  
pp. 16 ◽  
Author(s):  
Olof Sköldenberg ◽  
Mats Salemyr ◽  
Olle Muren ◽  
Åke Johansson ◽  
Torbjörn Ahl ◽  
...  
Keyword(s):  
Survival Rate ◽  
Penetration Rate ◽  
Osteolytic Lesion ◽  
Femoral Stem ◽  
Clinical Results ◽  
Linear Wear ◽  
Osteolytic Lesions ◽  
Linear Wear Rate ◽  
Head Penetration ◽  
Pelvic Osteolysis

The aim of this study was to compare the 10-year survival rate, pelvic osteolysis frequency and linear head penetration rate of the Hexloc and Ringloc liners used together with a partially threaded porous and hydroxyapatite coated cup and the Bi-Metric uncemented femoral stem. The 15-year results for the cup with the Hexloc liner are also reported. We included 332 consecutive hips (166 Hexloc and 166 Ringloc) on 281 patients in the study. Revisions of prosthesis components were recorded and pelvic osteolytic lesions were assessed using radiographs and computed tomography. The linear head penetration rate was measured using the Martell method. The 10-year survival rate of the liner with revision due to liner wear and/or osteolysis as endpoint was 88% for the Hexloc liner and 98% for the Ringloc liner. The 15-year survival rate of the Hexloc liner was 67%. Pelvic osteolysis was found in 27% of the Hexloc and 19% of the Ringloc hips. After 15 years, 53% of the Hexloc hips had developed an osteolytic lesion. The linear head penetration rate was 0.16 mm/year for the Hexloc liner and 0.12 mm/year for the Ringloc liner. This paper is the first to describe the rapidly deteriorating survival up to 15 years with the old generation gamma-in-air sterilized polyethylene used in Hexloc liners. The newer Ringloc liner with the ArCom™ polyethylene has superior clinical results but a linear wear rate and frequency of osteolytic lesions that is higher than expected.

Characterization of Long-Term Femoral-Head-Penetration Rates

2000 ◽  
Vol 82 (8) ◽  
pp. 1102-1107 ◽  
Author(s):  
JAMES E. DOWD ◽  
CHRISTI J. SYCHTERZ ◽  
ANTHONY M. YOUNG ◽  
CHARLES A. ENGH
Keyword(s):  
Femoral Head ◽  
Head Penetration ◽  
Femoral Head Penetration

Anatomical location of T2–3 sympathetic trunk and Kuntz nerve determined by transthoracic endoscopy

2002 ◽  
Vol 96 (1) ◽  
pp. 68-72 ◽  
Author(s):  
Yeou-Chih Wang ◽  
Ming-Hsi Sun ◽  
Chi-Wen Lin ◽  
Yen-Ju Chen
Keyword(s):  
Sympathetic Trunk ◽  
Anatomical Location ◽  
Content Type ◽  
Medial Border ◽  
Thoracic Sympathectomy ◽  
Operative Findings ◽  
The Right ◽  
Upper Thoracic ◽  
Rib Head ◽  
Fine Print

Object. Bilateral subaxillary transthoracic endoscopic sympathectomy (TES) is a popular procedure of upper thoracic sympathectomy. The anatomical locations of the T-2 and T-3 sympathetic trunks, as viewed under the endoscope, are varied in the rib head areas. In this study, the authors investigated the more visible anatomical locations of the T-2 and T-3 sympathetic trunks, the so-called nerves of Kuntz, and intercostal rami by performing transthoracic endoscopy. Methods. Seventy patients with palmar hyperhidrosis undergoing bilateral TES (140 sides) via the anterior subaxillary approach were included in this study. The operative findings and video images of the T-2 and T-3 sympathetic trunks and ganglia were recorded and analyzed. The anatomical locations of the T-2 and T-3 sympathetic trunks along the horizontal axes of the rib heads were determined using a three-region system constructed by the authors. The area between the rib neck and the medial border of the rib head was equally divided into Region E (external half) and Region M (medial half). The area between the medial border of the rib head and the paravertebral ligament was defined as Region I. The incidence of the T-2 and T-3 sympathetic trunks found in Regions E, M, and I were 31.4 to 42.9%, 50 to 57.1%, and 7.1 to 11.4%, respectively, on the left side, and 24.3 to 34.3%, 57.1 to 65.7%, and 8.6 to 10%, respectively, on the right side. One right (1.4%) and six left (8.6%) Kuntz nerves originating from the T-3 sympathetic trunk were found in seven patients (10%). The intercostal ramus was found around the T-2 rib neck in 24 patients (34.3%), with 18 cases (25.7%) for each side. The intercostal ramus around the T-3 rib neck was found in 17 patients (24.3%): 12 (17.1%) on the right and nine (12.9%) on the left. Conclusions. These results indicate that approximately 90% of the T-2 or T-3 sympathetic trunks are located on the rib head. These findings may also be used to assist the surgeon in fluoroscopic guidance for locating the T-2 and T-3 sympathetic trunks during posterior percutaneous sympathectomy.

scholarly journals Contemporary Dual Mobility Head Penetration at Five Years: Concern for the Additional Convex Bearing Surface?

2018 ◽  
Vol 33 (7) ◽  
pp. S280-S284 ◽  
Author(s):  
Evan R. Deckard ◽  
Khalid A. Azzam ◽  
R. Michael Meneghini
Keyword(s):  
Bearing Surface ◽  
Dual Mobility ◽  
Head Penetration

Assessment of MELCOR 1.8.5 Versus Different Versions of SCDAP/RELAP5 MOD 3.3 With Lower Head Creep Rupture Analysis of Alternative Accident Sequences of the Three Mile Island Unit 2

2004 ◽  
Author(s):  
Sang Lung Chan
Keyword(s):  
Flow Rate ◽  
Creep Rupture ◽  
Injection System ◽  
Base Case ◽  
Head Penetration ◽  
Pressure Injection ◽  
Lower Head ◽  
High Pressure Injection ◽  
Accident Sequences ◽  
Head Temperature

The objective of this analysis is to assess MELCOR 1.8.5-RG against SCDAP/RELAP5 MOD 3.3kz (SR5m33kz), and SCDAP/RELAP5 MOD 3.3bf (SR5m33bf). This lower head creep rupture analysis considers: (1) Three Mile Island Unit 2 (TMI-2) alternative accident sequence-1, and (2) TMI-2 alternative accident sequence-2. SCDAP/RELAP5 model of TMI-2 alternative accident sequence-1 includes the continuation of the base case of the TMI-2 accident with the reactor coolant pumps (RCP) tripped, and the High Pressure Injection System (HPIS) throttled after approximately 6000 s accident time, SCDAP/RELAP5 model of TMI-2 alternative accident sequence-2 is derived from the TMI-2 base case accident by tripping the RCP after 6000 s, and the HPIS is reactivated after 12,012 s. MELCOR model of TMI-2 alternative accident sequence-1 is based on MELCOR TMI-2 phase-2 model by tripping the RCP and throttling back the makeup flows to zero from 6000 s onward. In MELCOR model of TMI-2 alternative accident sequence-2, the RCP are tripped from 6000 s and the constant makeup flow rate of 3.75 kg/s — including pump seal flow rate, but without HPIS flow rate — is activated from 6000 s and beyond 10440 s. The simulation is run until the lower head wall ruptures. In addition, the lower head penetration failure is also calculated with MELCOR for both TMI-2 alternative accident sequences. Lower head temperature contours calculated with SCDAP/RELAP5 are visualized and animated with open source visualization freeware ‘OpenDX’. Significant findings of the analysis include: (1) the TMI-2 lower head wall fails by creep rupture with either deactivations or activations of the HPIS; (2) for the TMI-2 alternative accident sequence-1 the time to creep rupture calculated with MELCOR 1.8.5-RG, SR5m33kz, and SR5m33bf agrees reasonably; (3) the calculation with MELCOR for the TMI-2 alternative accident sequence-1 predicts that the lower head wall failure occurred earlier than penetration failure, while MELCOR predicts the opposite for the TMI-2 alternative accident sequence-2; (4) calculation with MELCOR for TMI-2 alternative accident sequence-2 shows that when the lower head wall fails the temperature calculated with MELCOR is 1810.9 K, which exceeds the melting temperature of 1789 K for carbon steel; (5) calculations with both SR5m33kz and SR5m33bf for both TMI-2 alternative accident sequences indicate that different lower head wall locations fail rapidly one after another by a delay of a few seconds, while this is not the case for MELCOR.

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