Quadriceps Moment Arm and Quadriceps Forces After Total Knee Arthroplasty

D’Lima, Darryl D.; Poole, Colin E.; Chadha, Harbinder S.; Hermida, Juan C.; Mahar, Andrew; Colwell, Clifford W.

doi:10.1097/00003086-200111000-00026

Cited by 105 publications

(96 citation statements)

References 20 publications

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“…The Scorpio single radius total knee prosthesis was introduced in 1996 in an attempt to reduce concerns associated with other types of designs including patellar symptoms [9][10][11]. To the best of the authors' knowledge this is the first study on a consecutive series of patients evaluated after a minimal five-year follow-up following this particular single radius TKA including such a high number of patients.…”

Section: Discussionmentioning

confidence: 99%

“…However, some concerns remain in relation to femoropatellar symptoms, anterior knee pain, patellar clunk, and backside wear [6][7][8]. Recently, an original design, based upon a single femoral radius has been introduced to improve the extensor mechanism function [9][10][11]. The aim of this retrospective study was to evaluate the minimal five-year follow-up clinical and radiological outcomes of the Scorpio (Stryker Orthopaedics, Mahwah, NJ) single radius total knee arthroplasty (TKA).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Scorpio single radius total knee arthroplasty. A minimal five-year follow-up multicentric study

Borrione¹,

Bonnevialle

Mabit

et al. 2011

International Orthopaedics (SICOT)

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Purpose Our goal was to evaluate the five-year follow-up results of the Scorpio single radius total knee arthroplasty. Method We performed a retrospective study based upon a multicentre database to evaluate the minimum five-year follow-up clinical and radiological results of 747 patients (831 knees) who underwent primary Scorpio single radius total knee arthroplasty. Results The mean age of the patients was 71.9 years. At a minimal five-year follow-up, 141 patients were lost to follow-up, 83 patients had died, eight patients had undergone revision of a component, and the remaining 589 patients (602 knees) had a complete clinical and radiological evaluation after a median of six years (range, 5-8). The mean clinical component of the knee score was 92.2 points, and the mean functional component of the knee score was 76.9 points. At last follow-up, 530 of the 602 knees were rated as excellent or good. Only four knees developed patellar complications requiring revision. The survival rate at six years was 95.2%±1.9% and 98.3%±0.6 with revision for any reason and revision for mechanical failure as the end point, respectively. Conclusion This medium-term study indicates favourable clinical and radiological results for this single flexionextension radius design arthroplasty, with a low complication rate on the patellar side.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Scorpio single radius total knee arthroplasty. A minimal five-year follow-up multicentric study

Borrione¹,

Bonnevialle

Mabit

et al. 2011

International Orthopaedics (SICOT)

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“…This design has been associated with improved extensor mechanism function and increased functional stability in posterior-stabilized designs [5,15,22,23]. Several features of this device, however, have been implicated as potential causes of early failure.…”

Section: Introductionmentioning

confidence: 99%

5- to 9-year Survivorship of Single-radius, Posterior-stabilized TKA

Mahoney

Kinsey

2008

Clinical Orthopaedics &Amp; Related Research

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We studied 1030 consecutive cemented primary TKAs performed by the primary author (OMM) using a single-radius, posterior-stabilized total knee prosthesis with 5 years' minimum followup to determine whether an accelerated early failure rate was associated with this design. At 5 to 9.5 postoperative years, 32 knees had been revised at an average of 2.4 postoperative years (range, 0.1-8.2 years) because of infection (11), periprosthetic fracture (10), aseptic loosening (eight), stiffness (two), and late hemarthrosis (one). Four had only the tibial insert revised. One-half of all failures occurred within 1.5 years. The cases of aseptic loosening involved the femoral component in one patient, tibial component in five, and both components in two. With only seven patients (0.7%) having unknown outcomes, the overall failure rate was 4.9 per 1000 person-years for the study period. The Kaplan-Meier survivorship using any part of the prosthesis removed or revised for any reason as the end point was 95.8% (95% confidence interval, 93.7%-95.5%), and with aseptic loosening as the end point, it was 98.6% (95% confidence interval, 96.5%-99.4%). The midterm survivorship rates were comparable to those of other posterior-stabilized total condylar designs and are not suggestive of excessive risk of early failure.

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“…17,18 Many in vitro studies compared knee kinematics before and after TKA, however, the knees were not at the end-stage of OA. [19][20][21] Most in vivo studies assessed the kinematics of either OA knees 18,22,23 or TKA knees. 7,9 Recently, one in vivo study evaluated the AP femoral translation and axial rotation of the knee before and after TKA under weight-bearing knee flexion.…”

mentioning

confidence: 99%

Kinematics of medial osteoarthritic knees before and after posterior cruciate ligament retaining total knee arthroplasty

Yue

Varadarajan

Moynihan

et al. 2010

Journal Orthopaedic Research

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Total knee arthroplasty (TKA) is a widely accepted surgical procedure for the treatment of patients with end-stage osteoarthritis (OA). However, the function of the knee is not always fully recovered after TKA. We used a dual fluoroscopic imaging system to evaluate the in vivo kinematics of the knee with medial compartment OA before and after a posterior cruciate ligament-retaining TKA (PCR-TKA) during weight-bearing knee flexion, and compared the results to those of normal knees. The OA knees displayed similar internal/external tibial rotation to normal knees. However, the OA knees had less overall posterior femoral translation relative to the tibia between 0 • and 105 • flexion and more varus knee rotation between 0 • and 45 • flexion, than in the normal knees. Additionally, in the OA knees the femur was located more medially than in the normal knees, particularly between 30 • and 60 • flexion. After PCR-TKA, the knee kinematics were not restored to normal. The overall internal tibial rotation and posterior femoral translation between 0 • and 105 • knee flexion were dramatically reduced. Additionally, PCR-TKA introduced an abnormal anterior femoral translation during early knee flexion, and the femur was located lateral to the tibia throughout weight-bearing flexion. The data help understand the biomechanical functions of the knee with medial compartment OA before and after contemporary PCR-TKA. They may also be useful for improvement of future prostheses designs and surgical techniques in treatment of knees with end-stage OA.

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Quadriceps Moment Arm and Quadriceps Forces After Total Knee Arthroplasty

Cited by 105 publications

References 20 publications

Scorpio single radius total knee arthroplasty. A minimal five-year follow-up multicentric study

Scorpio single radius total knee arthroplasty. A minimal five-year follow-up multicentric study

5- to 9-year Survivorship of Single-radius, Posterior-stabilized TKA

Kinematics of medial osteoarthritic knees before and after posterior cruciate ligament retaining total knee arthroplasty

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