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effect of medial patellofemoral

Tong-Hsien Chow, Yih-Shyuan Chen, Jia-Chang Wang
BACKGROUND: Plantar pressure measurement is effective for assessing plantar loading and can be applied to evaluating foot performance. We sought to explore the characteristics of plantar pressures in elite sprinters and recreational runners during static standing and walking. METHODS: Arch index (AI) values, regional plantar pressure distributions (PPDs), and footprint characteristics were examined in 80 elite sprinters and 90 recreational runners using an optical plantar pressure measurement system...
January 2018: Journal of the American Podiatric Medical Association
Lei Zhang, Zhiyao Li
Medial patellofemoral ligament (MPFL) reconstruction is a satisfactory technique for patellar instability, and the anatomical double bundle variant is recommended for better clinical results. However, long-term outcomes are still uncharacterized. This study aimed to assess the effectiveness of double bundle reconstruction of the MPFL for patellar instability by means of established scores. A total of 68 patients with chronic patellar instability who underwent surgery from May 2005 to February 2010 were included prospectively...
March 7, 2018: Journal of Knee Surgery
Yong-Xiang Zuo, Zi-Ping Ma
OBJECTIVE: To explore the operating procedures and therapeutic effects of medial patellofemoral ligament reconstruction with Tightrope(Arthrex, FL, USA) button fixation at lateral femoral cortex. METHODS: From May 2014 to July 2016, 9 patients with traumatic patellar dislocation were treated. There were 5 males and 4 females, ranging in age from 16 to 47 years old, with an average of 23.7 years old. All the patients underment arthroscopic lateral retinaculum release and joint debridement first...
November 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
Li-Chuang Wu, Hai-Bo Zhou, Chao Zhang, Lei Chen, Cai-Long Liu
OBJECTIVE: To study clinical effects of triad operation including reconstruction of medial patellofemoral ligament, release of lateral retinaculum, Fulkerson tibial tubercle osteotomy, medial transfer and advancement under arthroscopy for the treatment of habitual dislocation of patella. METHODS: From March 2010 to May 2016, 35 patients with habitual patellar dislocation were treated with the triad operation, including 14 males, 21 females, ranging in age from 18 to 38 years old, with an average of 25...
November 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
Chuan-Qiang Shao, Chang-Chun Chen, Chun-Cheng Zhao, Hong-Mei Yang, Yan-Zhong Kang
OBJECTIVE: To investigate surgical method and clinical curative effects of medial patellofemoral ligament (MPFL) reconstruction with great adductor muscular tendon in treating teenagers' recurrent patellar dislocation. METHODS: From May 2012 to September 2014, 19 patients with recurrent dislocation of patellar, including 6 males and 13 females with an average of 16 years old (ranged from 13 to 17 years), the courses of disease ranged from 3 to 18 months(averaged 6 months)...
June 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
Maike B Czasche, Jon E Goodwin, Anthony M J Bull, Daniel J Cleather
Objectives: To use a musculoskeletal model of the lower limb to evaluate the effect of a strength training intervention on the muscle and joint contact forces experienced by untrained women during landing. Methods: Sixteen untrained women between 18 and 28 years participated in this cohort study, split equally between intervention and control groups. The intervention group trained for 8 weeks targeting improvements in posterior leg strength. The mechanics of bilateral and unilateral drop landings from a 30 cm platform were recorded preintervention and postintervention, as was the isometric strength of the lower limb during a hip extension test...
2018: BMJ Open Sport & Exercise Medicine
Ryan J McNeilan, Joshua S Everhart, Patrick K Mescher, Moneer Abouljoud, Robert A Magnussen, David C Flanigan
PURPOSE: To determine whether graft selection or patient age affects the following after isolated medial patellofemoral ligament (MPFL) reconstruction: (1) rates of recurrent instability, (2) rates of postoperative complications (other than instability), and (3) subjective symptom improvement. METHODS: A systematic search identified studies reporting outcomes for isolated MPFL reconstruction. Rates of recurrent instability, subjective Kujala knee function scores, and complications were tabulated...
January 20, 2018: Arthroscopy: the Journal of Arthroscopic & related Surgery
Xing-Sen Liang, Zheng-Hong Yu, Yi-Kai Li, Ying-Ping Jiang, Xian-Wu Chen, Min Huang
OBJECTIVE: To study the contribution of medial or lateral stabilizer to the stability of the patella, to explore the function and effect of releasing the LPR clinically and to provide a biomechanical basis for the clinical treatment of patellar instability(PI). METHODS: The quadriceps femoris of 6 fresh human cadaver knees were loaded to simulate a normal condition of muscle strength. First the loading force was measured and recorded, which subluxated the patella with the different degrees of knee flexion...
April 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
Orlando D Sabbag, Jarret M Woodmass, Isabella T Wu, Aaron J Krych, Michael J Stuart
A varus-producing distal femoral osteotomy (DFO) is an effective technique for the treatment of lateral patellar instability (LPI) in patients with concomitant moderate to severe valgus malalignment. Patellar maltracking and subluxation are corrected via neutralization of some of the laterally directed forces on the patella due to the valgus deformity. This can be accomplished with a distal femoral lateral opening-wedge or medial closing-wedge osteotomy and medial soft tissue stabilization. A medial closing-wedge osteotomy offers the advantages of immediate weight bearing and a single incision in cases requiring patellofemoral soft tissue stabilization...
December 2017: Arthroscopy Techniques
R Kanna
The shifting demographics of patients with localized knee arthritis, including younger, more active patients, is a chief motivation for mounting interest in tissue preserving surgical substitutes for total knee arthroplasty (TKA). Unlinked, modular bi-compartmental knee arthroplasty (MBKA) is an emerging knee-resurfacing approach that provides a conservative alternative to TKA. Arthritis involving both patellofemoral and either medial or lateral tibiofemoral compartments, with no significant deformity or bone deficiency, preserved motion, and intact cruciate ligaments, can be effectively managed with MBKA...
March 2017: Acta Orthopaedica Belgica
Sebastien Pesenti, Matthieu Ollivier, Jean-Charles Escudier, Mathieu Cermolacce, Alexandre Baud, Franck Launay, Jean-Luc Jouve, Elie Choufani
PURPOSE: Management of post-traumatic patellar instability in children with osseous abnormalities is challenging because of the presence of an open physis. The aim of our study was to compare the rate of recurrence after isolated reconstruction of the medial patellofemoral ligament (MPFL) in children with or without osseous abnormalities. METHODS: The medical records of 25 children (27 knees) with recurrent patellar dislocation were reviewed. Each child underwent an isolated reconstruction of the MPFL using a hamstring graft...
January 4, 2018: International Orthopaedics
Joseph N Liu, Jacqueline M Brady, Irene L Kalbian, Sabrina M Strickland, Claire Berdelle Ryan, Joseph T Nguyen, Beth E Shubin Stein
BACKGROUND: Medial patellofemoral ligament (MPFL) reconstruction has become one of the most common and widely used procedures to regain stability among patients with recurrent lateral patellar dislocation. While recent studies demonstrated low recurrence rates, improved patient-reported outcome measures, and a high rate of return to sports, limited literature explored its effectiveness as an isolated intervention in the context of trochlear dysplasia. PURPOSE: To determine the efficacy of isolated MPFL reconstruction in treating patellar instability in the setting of trochlear dysplasia...
January 1, 2018: American Journal of Sports Medicine
(no author information available yet)
The etiology of patellofemoral pain (PFP) is thought to include both local factors (those near the patellofemoral joint and surrounding tissues) and nonlocal factors (those related to the mechanics of the distal and proximal joints). Traditionally, PFP rehabilitation protocols have focused on local factors. Strengthening of the hip may reduce excessive hip adduction and medial rotation during weightbearing activities and so decrease patellofemoral joint stresses. However, while previous studies indicate that including hip strengthening may lessen the intensity of PFP, the effects on strength and activity remain uncertain...
January 2018: Journal of Orthopaedic and Sports Physical Therapy
Phil D B Price, Conor Gissane, Daniel J Cleather
FreeBody is a musculoskeletal model of the lower limb used to calculate predictions of muscle and joint contact forces. The validation of FreeBody has been described in a number of publications; however, its reliability has yet to be established. The purpose of this study was, therefore, to establish the test-retest reliability of FreeBody in a population of healthy adults in order to add support to previous and future research using FreeBody that demonstrates differences between cohorts after an intervention...
2017: Frontiers in Bioengineering and Biotechnology
Arnd Steinbrück, Christian Schröder, Matthias Woiczinski, Alexander Glogaza, Peter E Müller, Volkmar Jansson, Andreas Fottner
INTRODUCTION: Lateral retinacular release (LRR) is a common procedure during total knee arthroplasty (TKA), especially if patellar maltracking is observed intraoperatively. The impact of LRR on patellofemoral kinematics is well-examined, but the influence on femorotibial kinematics requires more elucidation. Therefore, the aim of this study was to evaluate the effects of LRR on femorotibial kinematics in vitro. MATERIALS AND METHODS: A fixed bearing TKA was implanted in six human knee specimens...
March 2018: Archives of Orthopaedic and Trauma Surgery
Kilian Rueckl, Friedrich Boettner, Noor Maza, Armin Runer, Ulrich Bechler, Peter Sculco
OBJECTIVE: The aim of this study is to determine whether the posterior-anterior (PA)-flexed view improves the radiographic assessment of patients with knee pain compared with the standard standing anterior-posterior radiograph. MATERIALS AND METHODS: Three hundred and sixty-five patients with knee pain underwent anterior-posterior (AP), PA flexed, lateral, and Merchant radiographs of the knee. Knees were grouped as mild (Kellgren and Lawrence [K-L] 1-2) or severe (K-L 3-4) osteoarthritis (OA) and either varus (medial compartment), valgus (lateral compartment), or patellofemoral OA...
November 20, 2017: Skeletal Radiology
Marianne S Black, Agnes G d'Entremont, Robert G McCormack, Gregory Hansen, Derek Carr, David R Wilson
BACKGROUND: High tibial osteotomy is a surgical procedure to treat medial compartment osteoarthritis in varus knees. The reported success rates of the procedure are inconsistent, which may be due to sagittal plane alignment of the osteotomy. The objective of this study was to determine the effect of changing tibial slope, for a range of tibial wedge angles in high tibial osteotomy, on knee joint contact pressure location and kinematics during continuous loaded flexion/extension. METHODS: Seven cadaveric knee specimens were cycled through flexion and extension in an Oxford knee-loading rig...
November 2, 2017: Clinical Biomechanics
Afsaneh Zeinalzadeh, Saeed Talebian, Soofia Naghdi, Mahyar Salavati, Salman Nazary-Moghadam, Bahareh Zeynalzadeh Ghoochani
OBJECTIVE: To compare the effects of vision and cognitive load on static postural control in subjects with and without patellofemoral pain syndrome (PFPS). METHODS: Twenty-eight PFPS patients and 28 controls participated in the study. Postural control was assessed in isolation as well as with visual manipulation and cognitive loading on symptomatic limb. The outcome measures of postural control were quantified in terms of area, anterior-posterior (AP), medial-lateral (ML), and mean velocity (MV) of the displacements of center of pressure (COP)...
November 9, 2017: Physiotherapy Theory and Practice
Nicholas A Bonazza, Gregory S Lewis, Eric Z Lukosius, Evan P Roush, Kevin P Black, Aman Dhawan
PURPOSE: To determine whether (1) tunnels that breach the anterior cortex of the patella result in increased fracture risk and (2) transosseous tunnels drilled across the patella significantly reduce the tensile force needed to fracture the patella. METHODS: Twenty-six fresh-frozen cadaveric human patellas were randomized to 1 of 3 groups: a control group with unmodified patellas, a group with 2 transverse tunnels (TT) that did not breach the anterior cortex, and a group with 2 TT that breached the anterior cortex of the patella (PA)...
October 31, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
Berkay Unal, Betina B Hinckel, Seth L Sherman, Christian Lattermann
For lateral retinaculum (LR) tightness, release or lengthening is the indicated surgical correction. LR release (LRR) or lengthening (LRL) may be a primary treatment for painful lateral compression syndrome or as an adjunct treatment in the setting of patellofemoral instability. Although it is challenging, assessment of the soft-tissue balance between the medial restraint (the medial patellofemoral ligament) and the lateral restraint (the lateral retinaculum) is fundamental to a good outcome. LRR and LRL are effective in the treatment of patellofemoral disorders in which lateral tightness is part of the pathology...
September 2017: American Journal of Orthopedics
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