The Effect of Patellar Orientation on the Stiffness of the Porcine Femur-Medial Patellofemoral Ligament-Patella Complex

2011 ◽  
Author(s):  
Kwang E. Kim ◽  
Shanlin Hsu ◽  
Matthew B. Fisher ◽  
Savio L-Y. Woo
Keyword(s):  
Patellar Dislocation ◽  
Medial Patellofemoral Ligament ◽  
Primary Repair ◽  
Biomechanical Properties ◽  
The Us ◽  
Follow Up Studies ◽  
Graft Tissue ◽  
Redislocation Rate ◽  
Selection Of

Patellar dislocation has an incidence of 5.8 per 100,000 per year in the US, and this number increases by five-fold for adolescents 1. Conservative management has been the preferred treatment, but recent follow-up studies have revealed a high redislocation rate. Similar outcomes were also found following primary repair of the medial patellofemoral ligament (MPFL) 2. As a result, replacement with soft tissue autografts has gained attention for recurrent patellar dislocations in recent years 2, 3. As such, the selection of an appropriate graft tissue will need the knowledge of the biomechanical properties of the FMPC, particularly its stiffness for the performance of the graft.

Adductor Spastic Dysphonia: 1 1/2 Years after Recurrent Laryngeal Nerve Resection

1981 ◽  
Vol 90 (1) ◽  
pp. 2-6 ◽  
Author(s):  
Arnold E. Aronson ◽  
Lawrence W. DeSanto
Keyword(s):  
Recurrent Laryngeal Nerve ◽  
Laryngeal Nerve ◽  
Physical Effort ◽  
Patients Âgés ◽  
Reduced Volume ◽  
Follow Up Studies ◽  
Long Term Follow Up ◽  
Selection Of

After recurrent laryngeal nerve resection for adductor spastic dysphonia, the voices of 37 patients (ages 39 to 79 years) were assessed 24 hours, 1 month, 6 months, and 1 year after surgery, and those of 33 patients up to 1 1/2 years after surgery. By 24 hours after surgery, 97% of patients had improved and 3% had failed; by 1 month, 97% were still improved while 3% had failed; by 6 months, 92% had maintained improvement while 8% had failed; by 1 year, 68% were still improved but 32% had failed; and by 1 1/2 years, 61% were still improved while 39% had failed. The patients whose voices improved varied from one another in both type and degree of residual dysphonia. The typical postsurgical voice was free of spasm, with some breathiness, hoarseness, and reduced volume being present. The voices of some patients approached normalcy. To most patients, relief from the physical effort to phonate was as important as the improved voice. Continued long-term follow-up studies and careful, collaborative selection of surgical candidates are needed.

scholarly journals Clinical Outcomes After Medial Patellofemoral Ligament Reconstruction With Suture Fixation of the Gracilis Tendon via Transosseous Tunnels

2020 ◽  
Vol 8 (2) ◽  
pp. 232596711990037
Author(s):  
Hangzhou Zhang ◽  
Mao Ye ◽  
Qingwei Liang
Keyword(s):  
Patellar Dislocation ◽  
Medial Patellofemoral Ligament ◽  
Case Series ◽  
Mpfl Reconstruction ◽  
Suture Fixation ◽  
Recurrent Patellar Dislocation ◽  
Patellar Tilt ◽  
Transosseous Suture ◽  
Patellar Tilt Angle

Background: Several fixation methods have been introduced in medial patellofemoral ligament (MPFL) reconstruction. However, the optimal management of patients with recurrent patellar dislocation remains controversial. Purpose: To present a case series with a minimum 2-year follow-up of 29 patients with recurrent patellar dislocation who underwent a new transosseous suture fixation technique for MPFL reconstruction. Study Design: Case series; Level of evidence, 4. Methods: From January 2014 through February 2016, a total of 29 patients with recurrent patellar dislocation for which the MPFL was reconstructed with transosseous suture patellar fixation were studied. All patients were available for follow-up (mean, 37.52 months; range, 26-48 months). The patellar attachment was fixed by transosseous patellar sutures. The International Knee Documentation Committee (IKDC) subjective knee score, Kujala score, Tegner score, range of motion, congruence angle, patellar tilt angle, and complications were assessed both pre- and postoperatively. Results: No recurrent dislocation was observed in any of the 29 patients for a minimum of 2 years. All outcome scores improved significantly from preoperatively to postoperatively: the average IKDC subjective knee evaluation score from 53 to 87, Kujala from 54 to 90, Lysholm from 50 to 89, and Tegner from 3 to 5 ( P < .001 for all). The congruence angle significantly decreased from 22° preoperatively to –3° postoperatively, and the patellar tilt angle (Merchant) decreased from 23° preoperatively to 5° postoperatively ( P < .001 for both). In total, 25 patients (25/29; 86.21%) were completely pain-free when performing activities of daily living at the last follow-up, and 27 patients (93.1%) rated themselves as very satisfied or satisfied with the results. Conclusion: In patients with chronic recurrent patellar dislocation, transosseous patellar suture fixation for MPFL reconstruction can significantly improve patellar stability and achieve good results at short-term follow-up.

scholarly journals Extensive Lateral Release and Medial Patellofemoral Ligament Reconstruction in 25 Years of Chronic Fixed Lateral Patellar Dislocation: A 5-Year Follow-Up Case Report

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Andri M. T. Lubis ◽  
Petrus Aprianto ◽  
Yudistira P. Siregar
Keyword(s):  
Patellar Dislocation ◽  
Ligament Reconstruction ◽  
Medial Patellofemoral Ligament ◽  
Daily Activities ◽  
Lateral Release ◽  
Medial Patellofemoral Ligament Reconstruction ◽  
Lateral Dislocation ◽  
Lateral Patellar Dislocation ◽  
The Right

Lateral dislocation of the patella is not uncommon and may impede daily activities as this causes compressive dysfunction and instabilities. Most cases of patellar lateral dislocation are due to damage to the medial patellofemoral ligament (MPFL), either rupture of detachment of the patella or femoral attachment. MPFL reconstruction alone was considered adequate for the treatment of this condition. We present a case of a 49-year-old male with chronic posttraumatic lateral patellar dislocation of the right knee of 25 years, which we treated with extensive lateral release and right medial patellofemoral ligament reconstruction with 5-year follow-up data.

scholarly journals Tracking Errors of Exchange Traded Funds in Bursa Malaysia

2019 ◽  
Vol 11 (2) ◽  
pp. 96
Author(s):  
Alfred Ing-Soon Ku ◽  
Venus Khim-Sen Liew ◽  
Chin-Hong Puah
Keyword(s):  
Tracking Error ◽  
Exchange Traded Funds ◽  
Tracking Errors ◽  
Retail Investors ◽  
Follow Up Studies ◽  
Tracking Ability ◽  
Selection Of

This study measures the tracking errors of exchange traded funds (ETFs) listed in Bursa Malaysia. Five measures of tracking errors are estimated in this study for the seven ETFs involved. Overall, the best ETF is METFAPA with the least tracking error. The ranking of the remainder ETFs, in the ascending order of tracking error is MYETFID, METFSID, MYETFDJ, CIMC50, FBMKLCI-EA and CIMBA40 (highest tracking error). The findings in this study is expected to provide clue for passive institutional and retail investors on their selection of ETFs to mimic the portfolio of the desired underlying assets. Moreover, it is anticipated that these findings will motivate the improvement in the tracking ability of the existing ETFs, solicit more follow up studies to encourage the development of new ETFs and increase the participation of investors.

scholarly journals Medial patellofemoral ligament reconstruction combined with biplanar supracondylar femoral derotation osteotomy in recurrent patellar dislocation with increased femoral internal torsion and genu valgum: a retrospective pilot study

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Xiangtian Deng ◽  
Lingzhi Li ◽  
Peng Zhou ◽  
Fuyuan Deng ◽  
Yuan Li ◽  
...  
Keyword(s):  
Clinical Outcomes ◽  
Patellar Dislocation ◽  
Medial Patellofemoral Ligament ◽  
Mechanical Axis ◽  
Genu Valgum ◽  
Mpfl Reconstruction ◽  
Ct Scans ◽  
Recurrent Patellar Dislocation ◽  
Derotation Osteotomy

Abstract Background The purpose of this study was to evaluate the clinical and radiographic outcomes after medial patellofemoral ligament (MPFL) reconstruction combined with supracondylar biplanar femoral derotation osteotomy (FDO) in recurrent patellar dislocation (RPD) with increased femoral anteversion angle (FAA) and genu valgum. Methods Between January 2017 to December 2020, a total of 13 consecutive patients (13 knees, 4 males and 9 females, mean age 18.7 (range, 15–29 years) with RPD with increased FAA (FAA > 25°) and genu valgum (mechanical axis deformity of ≥5°) who underwent supracondylar biplanar FDO using a Tomofix-locking plate combined with MPFL reconstruction in our institution were included. Preoperative full-leg standing radiographs, lateral views, and hip-knee-ankle computed tomography (CT) scans were used to evaluate the mechanical lateral distal femoral angle (mLDFA), anatomical femorotibial angle (aFTA), mechanical axis, patellar height, tibial tubercle-trochlear groove (TT-TG) distance, and torsional angle of the tibial and femoral in the axial plane. Patient reported outcomes were evaluated using the International Knee Documentation Committee (IKDC) score, Kujala score, Lysholm score, visual analog scale (VAS), and Tegner score preoperatively and postoperatively. Postoperative CT scans were used to evaluate the changes of FAA and TT-TG, and full-leg standing radiographs was used to evaluate the changes of mLDFA, aFTA, and mechanical axis. Results A total of 13 patients (13 knees) were included with an average follow-up period of 26.7 months (range 24–33). No cases developed wound infection, soft tissue irritation, and recurrent patellar dislocation during the follow-up period after surgery. Bone healing at the osteotomy site was achieved in all cases, and all patients regained full extension and flexion. Clinical outcomes (VAS, Kujala, IKDC, Lysholom, and Tegner scores) improved significantly at the final follow-up after surgery (p < 0.05). The mean mLDFA, aFTA, mechanical axis, and TT-TG distance showed statistically significant improvement following the combined surgery (p < 0.05), while the CDI did not change significantly after surgery (p>0.05). Conclusion MPFL reconstruction combined with supracondylar biplanar FDO showed satisfactory clinical outcomes and radiographic results in the short-term follow-up period.

scholarly journals 1 What Beliefs are Associated with COVID Vaccination Intentions? Implications for Campaign Planning

2020 ◽  
Author(s):  
Robert Hornik ◽  
Chioma Woko ◽  
Leeann Siegel ◽  
Kwanho KIm ◽  
Ava Kikut ◽  
...  
Keyword(s):  
Representative Survey ◽  
The Us ◽  
Rapid Changes ◽  
Follow Up Studies ◽  
Race Ethnicity ◽  
Nationally Representative ◽  
Vaccine Availability

COVID vaccination intentions vary among the US population. We report the results of a nationally representative survey undertaken in July 2020 (N=889) that examined the association of six vaccine-specific beliefs with intentions to vaccinate. We find that four of the six beliefs have substantial associations with intention (Gammas between .60 and .77), that the associations mostly do not vary with gender, age, race/ethnicity, or misinformation (even though intentions do vary with each of those variables). Also, once adjusted for the vaccine-specific beliefs, level of misinformation is not related to intentions. We consider the implications of these results and argue both that persuasive campaigns can be informed by these specific results, and given rapid changes in vaccine availability, that there is a substantial need for elaborated and repeated follow-up studies.

Malleus Grip Prosthesis

1986 ◽  
Vol 95 (5) ◽  
pp. 531-534 ◽  
Author(s):  
Harold F. Schuknecht ◽  
Mary L. Bartley
Keyword(s):  
Hearing Loss ◽  
Conductive Hearing Loss ◽  
Stapes Surgery ◽  
Sensorineural Hearing ◽  
Follow Up Studies ◽  
Significant Change ◽  
Conductive Hearing ◽  
Selection Of

The malleus grip prosthesis is designed for ears with conductive hearing loss caused by pathologic conditions of the stapes in association with pathologic conditions of the malleus or incus. The malleus grip procedure was performed on 220 ears, and follow-up studies are available on 203. Mild to profound sensorineural hearing losses occurred in 16 (8.37%). The remaining 187, on the first postoperative test, had an average air-bone gap of 14 dB, and subsequent examinations on 100 of them showed no significant change with the passage of time. The procedure is technically more difficult than stapes surgery for otosclerosis, and success is highly dependent upon selection of appropriate cases and meticulous implantation of the prosthesis.

scholarly journals Preoperative Complete Patellofemoral Dislocation in Extension Predicts an Inferior Clinical Outcome After Medial Patellofemoral Ligament Reconstruction in Patients With Recurrent Patellar Dislocation

2020 ◽  
Vol 8 (7) ◽  
pp. 232596712093898
Author(s):  
ZhiJun Zhang ◽  
GuanYang Song ◽  
QianKun Ni ◽  
Tong Zheng ◽  
Yanwei Cao ◽  
...  
Keyword(s):  
Patellar Dislocation ◽  
Trochlear Dysplasia ◽  
Tibial Tubercle ◽  
Control Group ◽  
3 Dimensional ◽  
Patellar Maltracking ◽  
Patient Reported ◽  
The Mean ◽  
Redislocation Rate

Background: Habitual patellar dislocation in extension (HPD-E) is a distinctive subtype of recurrent patellar dislocation (RPD); HPD-E represents the most severe type of patellar maltracking in RPD. It has been reported that the presence of preoperative patellar maltracking is associated with a worse clinical outcome after medial patellofemoral ligament (MPFL) reconstruction (MPFL-R). Purpose: To describe the radiological characteristics of HPD-E and to compare clinical outcomes after MPFL-R among patients with and without preoperative HPD-E. Study Design: Cohort study; Level of evidence, 3. Methods: From January 2012 to December 2015, a total of 230 consecutive patients (246 knees) with RPD were treated with MPFL-R alone or combined with tibial tubercle osteotomy. Among them, 28 patients diagnosed with HPD-E by preoperative 3-dimensional computed tomography (CT; HPD-E group) were matched in a 1:1 fashion to 28 control participants who did not show HPD-E (control group). Routine radiography and CT were performed to evaluate patellar height, trochlear dysplasia, tibial tubercle–trochlear groove distance, and torsional deformities. The mean patellar laxity index and lateral patellar translation assessed with stress radiography were measured preoperatively and postoperatively to quantify MPFL laxity. At minimum 2-year follow-up, patient-reported outcomes (Kujala, Lysholm, and Tegner scores), patellar maltracking, and redislocation rates were compared between the HPD-E and control groups. Results: The radiological characteristics of the HPD-E group were as follows: 89% (25/28) of patients had severe trochlear dysplasia (Dejour type B or D), and the mean femoral anteversion angle was 35.5° ± 4.7°. At the final follow-up, the HPD-E group had a significantly lower Kujala score (76.2 vs 84.5, respectively; P = .001), Lysholm score (75.4 vs 86.6, respectively; P < .001), and Tegner score (4.1 vs 5.8, respectively; P = .021) compared with the control group. The postoperative patellar laxity index (43% vs 19%, respectively; P < .001) and redislocation rate (25% vs 0%, respectively; P = .01) were significantly higher in the HPD-E group than in the control group. Conclusion: Preoperative 3-dimensional CT is a reliable method of identfying patients with HPD-E. Treatment of HPD-E by MPFL-R alone or combined with tibial tubercle osteotomy resulted in a higher redislocation rate, more severe MPFL residual laxity, and lower patient-reported outcome scores compared with patients without HPD-E who underwent MPFL-R.

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