The knee in full flexion

Pinskerová, V.; Samuelson, Kent M.; Stammers, John; Maruthainar, K.; Sosna, A; Freeman, Michael

doi:10.1302/0301-620x.91b6.22319

Cited by 54 publications

(32 citation statements)

References 13 publications

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“…Interestingly, the results of the present study also found increased contact strains in the lateral compartment at 105° of flexion. Since the medial meniscus is believed to have an important role in transmitting load in higher flexion angles (Lee et al, 2006; Pinskerova et al, 2009; Seitz et al, 2011; Yao et al, 2008), it is likely that disruptions in the position of the knee due to a medial meniscus tear alter load transmission through the lateral compartment as well, as observed in this study.…”

Section: Discussionmentioning

confidence: 64%

In vivo cartilage strain increases following medial meniscal tear and correlates with synovial fluid matrix metalloproteinase activity

Carter

Taylor

Spritzer

et al. 2015

Journal of Biomechanics

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Meniscal tears are common injuries, and while partial meniscectomy is a frequent treatment option, general meniscus loss is a risk factor for the development of osteoarthritis. The goal of this study was to measure the in vivo tibiofemoral cartilage contact patterns in patients with meniscus tears in relation to biomarkers of cartilage catabolism in the synovial fluid of these joints. A combination of magnetic resonance imaging and biplanar fluoroscopy was used to determine the in vivo motion and cartilage contact mechanics of the knee. Subjects with isolated medial meniscus tears were analyzed while performing a quasi-static lunge, and the contralateral uninjured knee was used as a control. Synovial fluid was collected from the injured knee and matrix metalloproteinase (MMP) activity, sulfated glycosaminoglycan, cartilage oligomeric matrix protein, prostaglandin E2, and the collagen type II cleavage biomarker C2C were measured. Contact strain in the medial compartment increased significantly in the injured knees compared to contralateral control knees. In the lateral compartment, the contact strain in the injured knee was significantly increased only at the maximum flexion angle (105°). The average cartilage strain at maximum flexion positively correlated with total MMP activity in the synovial fluid. These findings show that meniscal injury leads to loss of normal joint function and increased strain of the articular cartilage, which correlated to elevated total MMP activity in the synovial fluid. The increased strain and total MMP activity may reflect, or potentially contribute to, the early development of osteoarthritis that is observed following meniscal injury.

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Section: Discussionmentioning

confidence: 64%

In vivo cartilage strain increases following medial meniscal tear and correlates with synovial fluid matrix metalloproteinase activity

Carter

Taylor

Spritzer

et al. 2015

Journal of Biomechanics

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“…First, the posterior part of the lateral femoral condyle was posteriorly displaced. During deep flexion kneeling, the posterior surface of the tibia and posterior aspect of the femoral condyle are in direct contact [6]. Thus, a malunited femoral condyle may prevent hyperflexion.…”

Section: Discussionmentioning

confidence: 99%

Intra-articular corrective osteotomy for malunited Hoffa fracture: A case report

Iwai

Hamada

Miyama

et al. 2012

BMC Sports Sci Med Rehabil

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Hoffa fracture, an isolated coronal plane fracture of the posterior aspect of the femoral condyle, is known as an unstable, intra-articular fracture, and therefore, operative treatment is recommended. However, insufficient open reduction or failure of fixation may lead to malunion. We performed intra-articular corrective osteotomy for a malunited Hoffa fracture in a 31-year-old man and obtained good functional and radiographic results. This report suggests that intra-articular corrective osteotomy for malunited Hoffa fracture offers a good outcome and should be considered as salvage treatment.

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“…These features were intended to provide stability to the TKA throughout the whole range of flexion [4]. The lateral condylar design was a single 24 mm anteroposterior radius design, with a matching concavity in the lateral side of the polyethylene insert intended to tolerate some rotation around the medial sphere and thereby conform to the reported kinematics of the natural knee [5]- [8].…”

Section: Methodsmentioning

confidence: 99%

A Brief Follow-Up Report on 228 Medial Rotation Total Knee Replacements at a Mean of 8.5 Years (0 - 19)

McMahon¹,

Scott²

2015

IJCM

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We present an update in our earlier report on the Medial Rotation Total Knee Arthroplasty (TKA) when a cohort of 228 TKAs in 189 patients (78 M; 111 F) with a mean age of 67.9 years (28 -90) was reported at a mean follow-up of six years (1 -13). At that time, the ten-year survivorship for revision for any reason was 94.5% (95% confidence interval (CI): 85.1 -100), but only 21 knees were at risk at that tenth year. The 10th annual report of the National Joint Registry (NJR) of England, Wales and Northern Ireland reported a deterioration in survivorship of the Medial Rotation TKA beyond the seventh year of follow-up. This implant previously had enjoyed the lowest rate of revision for any reported brand of prosthesis. As a result, we undertook a comprehensive audit of our original cohort at a mean follow-up of 8.5 years (0 -19). With revision for aseptic loosening, and revision for any reason as the endpoints, with 125 prostheses at risk at ten years, the ten-year survivorship was 96.7% (95% CI: 93.3 -100) and 92.3% (95% CI: 87.7 -93.7) respectively. We have confirmed a decline in survivorship at ten years compared to our initial report. We believe that our results probably provide a more accurate picture of the longevity of the implant than figures available from the NJR, as they are based on detailed contemporary enquiries into each patient's circumstances. Only ten knees in seven patients were lost to follow-up in our review.

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The knee in full flexion

Cited by 54 publications

References 13 publications

In vivo cartilage strain increases following medial meniscal tear and correlates with synovial fluid matrix metalloproteinase activity

In vivo cartilage strain increases following medial meniscal tear and correlates with synovial fluid matrix metalloproteinase activity

Intra-articular corrective osteotomy for malunited Hoffa fracture: A case report

A Brief Follow-Up Report on 228 Medial Rotation Total Knee Replacements at a Mean of 8.5 Years (0 - 19)

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