Effects of lateral retinacular release on the lateral stability of the patella

Christoforakis, Joseph J.; Bull, Anthony M.J.; Strachan, R. K.; Shymkiw, Roxane C.; Senavongse, Wongwit; Amis, Andrew A.

doi:10.1007/s00167-005-0699-5

Cited by 144 publications

(119 citation statements)

References 18 publications

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“…2) was similar to previous reports. 10,11,17,20 The medial and lateral restraining forces of the patellofemoral joint were comparable at 08 flexion. Then, the medial restraint progressively increased as the knee was flexed to 908.…”

Section: Discussionmentioning

confidence: 87%

“…15 This is the first quantitative study in the literature to have investigated the effect of loading the ITB on the mechanical stability of the patella; that was defined by measuring the restraining forces needed to displace the patella a fixed distance medially or laterally from its equilibrium position. The lateral retinaculum contributed 10% of the lateral restraining force at 208 knee flexion in one study 16 and 19 17 in another. However, most studies have concentrated on the medial retinaculum.…”

Section: Discussionmentioning

confidence: 91%

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Iliotibial band tension reduces patellar lateral stability

Merican

Iranpour

Amis

2009

Journal Orthopaedic Research

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This study investigated the effect of loading the iliotibial band (ITB) on the stability of the patellofemoral joint. We measured the restraining force required to displace the patella 10 mm medially and laterally (defined as medial and lateral stability, respectively) in 14 fresh-frozen knees from 0 to 908 knee flexion. The testing rig allowed the patella to rotate and translate freely during this displacement. The quadriceps was separated into five components and loaded with 175 N total tension. Testing was performed at 0 to 90 N ITB tension. With no ITB tension, the lateral restraining force ranged from 82 to 101 N across 0 to 908 flexion. Increasing ITB tension caused progressive reduction of the lateral restraining force. The maximum reduction was 25% at 608 flexion and 90 N ITB tension. Medial restraining force increased progressively with increasing knee flexion and increasing ITB loads; it ranged from 74 N at 08 knee flexion and 0 N ITB tension to 211 N at 908 knee flexion and 90 N ITB tension. The maximum effect was an increase of medial restraining force of 50% at 908 flexion and 90 N ITB tension. ß

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 91%

Iliotibial band tension reduces patellar lateral stability

Merican

Iranpour

Amis

2009

Journal Orthopaedic Research

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“…PFPS treatment covers a wide variety of surgical procedures like tibial tuberosity transfer, lateral retinacular release, trocheoplasty or sagittal osteotomy of the patella after Morscher. The biomechanical changes in alignment of the quadriceps muscle, the patella and the patellar tendon improves the use of cartilage by enlarging the area of surface contact taking pressure, the nutrition of the cartilage due to a greater contact area of patella and femur and reduces the intramedullary pressure to lower or eliminate pain [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Density and strength distribution in the human subchondral bone plate of the patella

Hoechel

Wirz

Müller‐Gerbl

2012

International Orthopaedics (SICOT)

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Purpose The aim of this study was to map the strength distribution of the human patella and correlate it to the subchondral bone plate density obtained by means of computed tomographyosteoabsorptiometry (CT-OAM). Methods Measurements were performed at 34 standardized points on each patella. The mineralization patterns of the subchondral bone plate of 20 patellae were displayed with the help of CT-OAM. False-coloured distribution patterns for our measurements were generated. The mechanical strength was determined at the same points by indentation testing. Results We showed that neither the density nor the mechanical strength is distributed homogeneously but exhibited regular, reproducible distribution patterns which mirror long-term stress distribution in articular surfaces. A direct correlation was found between both parameters in the subchondral bone plate. ConclusionThe correlation of density and mechanical strength makes CT-OAM a valuable tool to assess and monitor changes in the strength of the subchondral bone plate in vivo.

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“…It has been shown recently that lateral release can allow the patella to be displaced laterally by a significantly reduced force in a normal knee in vitro [29]. Furthermore, there is increasing evidence of the stability role of the medial patellofemoral ligament [30,31,33], which contributes most of the passive restraint to patellar lateral displacement when the knee is near extension.…”

Section: Discussionmentioning

confidence: 99%