Infrapatellar Straps Decrease Patellar Tendon Strain at the Site of the Jumper's Knee Lesion: A Computational Analysis Based on Radiographic Measurements (original) (raw)
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Scandinavian Journal of Medicine & Science in Sports, 2015
Numerous athletes with patellar tendinopathy (PT) use a patellar strap or sports tape during sports. This study's aim was to investigate the short-term effect of these orthoses on patellar tendon pain. Participants performed the single-leg decline squat, vertical jump test, and triplehop test under four different conditions (patellar strap, sports tape, placebo, and control). Subsequently, participants practiced sports as usual for 2 weeks; during 1 week, they were assigned to one of the four conditions. Pain was measured with the visual analog scale (VAS). In total, 97 athletes with PT [61% male, age 27.0 (SD8.1), VISA-P 58.5 (SD12.7)] were analyzed. On the single-leg decline squat, the VAS pain score reduced significantly in the patellar strap (14 mm, P = 0.04) and the sports tape condition (13 mm, P = 0.04), compared with control, but not placebo. A significant decrease in VAS pain during sports was found in the sports tape (7 mm, P = 0.04) and placebo group (6 mm, P = 0.04). The VAS pain score two hours after sports decreased significantly in the patellar strap, sports tape and placebo group (8-mm, P < 0.001, 10 mm, P = 0.001 and 7 mm, P = 0.03, respectively). This study's findings indicate that an orthosis (including placebo tape) during sports can reduce pain in PT patients in the short term.
Background Anterior knee pain syndrome is one of the most common problem in knee. Prevalence of this problem on orthopedic center is almost 23-31%. This syndrome happens in athletes, teenagers and specially in females. Trauma, malalignment maltracking of patella and degenerative joint disease or a combination of mentioned disorders seems to be the main cause of the syndrome. The perpose of this study was to identify and compare effects of infera-patella and cho-pat straps on knee strenghs and Rom … Material and Methods 30 patients with Ant pain synd. were evaluated and devided into two groups. Cho-pat strap applied to the first group and infrapottellar strap to the second. Knee extension strength and ROM was evaluated in 3 stages. 1) Before applying the strap 2) Immediately after applying the strap 3) 2week after applying the strap. Dynamometer, goniometer and visual analague scale were used to measare the strengh, Rom and pain respectivly. Results knee ext. strength increased significantly in the second and third stages of the test for both groups (P<0.05)howerer ,there was a decrase in pain and ROM (P<0.05). In the cho-pat strap group ROM decreased mor than infrapatellar group (P<0.05). Conclusion According to our finding reduction of knee pain induce to increasing of knee strength. In addition decreasing of pain results in control of knee ROM and decrease pressure on articular surfaces of patellofemoral joint
prevalence of PT in sports involving jump actions suggests that PT is instigated through jumping, that is, by takeoff and/or landing (and, hence, the label jumper's knee). Therefore, to understand the aetiology of PT, it is necessary to at least understand the relation between PT and takeoff and landing. Indeed, a number of biomechanical studies have investigated how characteristics of takeoff and landing may be related to PT. The aim of this systematic review is to come to a better understanding of how PT may be related to takeoff and landing biomechanics. Studying both jump phases may give more insight into the development of PT, while also addressing the question whether takeoff and landing potentially pose diff erent risk for developing PT. In this way risk factors may be uncovered which can be used to identify takeoff and/ or landing patterns in athletes which predispose them for developing PT. Subsequently, potential means for prevention and rehabilitation of PT can be developed through changing these predisposing patterns.
Iliotibial band tension reduces patellar lateral stability
Journal of Orthopaedic Research, 2009
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.
Biomechanical evaluation of patellar tendon repair using Krackow suture technique
BioMedical Engineering OnLine
Background The patellar tendon is an integral part of the knee extensor mechanism. Although tendon rupture is rare, it is a potentially devastating injury. Approximately, 3-6% of all knee extensor mechanism injuries are patellar tendon ruptures [1]. Rapid contraction of the quadriceps muscle with knee flexion is the primary injury mechanism of patellar tendon rupture, and it often occurs in young athletes involved in jumping activities [2, 3]. The eccentric loading from the quadriceps is transferred to the tendon, and the tendon insertion often absorbs the largest force, and thus, is a common injury site [4]. Other
Journal of sport rehabilitation, 2013
A valgus position of the knee on functional loading tasks has been reported to be associated with patellofemoral-joint pain. Training programs to reduce knee valgus have been shown to be effective but take time. It would appear logical to use a brace or strap to help control this knee motion to reduce symptoms. To assess the impact of the SERF strap on knee valgus and patellofemoral-joint pain. Repeated measures. University human performance laboratory. 12 women with patellofemoral pain (mean age 24 ± 3.2 y). Application of SERF strap. Knee-valgus angle on single-leg squat and step landing and visual analog scale pain score. The application of the SERF brace significantly reduced the pain (P < .04) and knee valgus (P < .034) during both tasks. The SERF brace brings about a significant reduction in pain during functional tasks. Although the brace brought about a significant reduction in knee valgus, this failed to exceed the smallest-detectable-difference value, so the differen...