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Deborah Ammeen

Publications and source records attributed to Deborah Ammeen.

5 recordsLinked to original sources
PubMed2005

Augments and allografts in revision total knee arthroplasty: usage and outcome using one modular revision prosthesis.

Sixty-five consecutive Coordinate (DePuy, Warsaw, Ind) revision total knee arthroplasties were eligible for minimum 5-year follow-up. Nine patients died and 2 patients were lost. Therefore, 54 knees (51 patients) had a known outcome. Nine knees failed and required either revision or component removal. Eight additional knees were considered clinical failures. Despite the use of metallic augmentation in 89% of the knees, large structural allografts were required in 48% of the knees. Revisions with bone loss that required bulk allograft failed less often (19.2%) than revisions managed without bulk allografts (42.9%). Of 24 knees originally revised for osteolysis/polyethylene wear, only 1 required rerevision for the same mechanism of failure. Modular augments did not effectively address the bone loss and instability encountered in many instances at revision surgery. Survivorship of this implant was 79.4% +/- 13.7% at 8 years.

Adult↗
PubMed2004

Is an intact anterior cruciate ligament needed in order to have a well-functioning unicondylar knee replacement?

Controversy exists about whether a functional anterior cruciate ligament is necessary to achieve success with unicompartmental knee arthroplasty. When the anterior cruciate ligament was deficient, higher failure rates were reported with mobile-bearing implants and with the Lotus implant, a relatively flat, fixed-bearing component. Most failures were secondary to wear. In contrast, the absence of an anterior cruciate ligament did not lead to failure with the St. Georg and Marmor implants. Theoretically, an absent anterior cruciate ligament would increase the sliding motion that caused accelerated polyethylene wear in laboratory studies. Hypothetically, such motion could lead to accelerated wear of unicompartmental arthroplasty in an ACL deficient knee. Currently, unicompartmental knee arthroplasties should not be done in patients with symptoms of anterior cruciate ligament instability and should judiciously be done in older patients without a functional anterior cruciate ligament but with no symptoms of instability.

Anterior Cruciate Ligament↗
PubMed2002

Outcome of knee arthroplasty in patients with poor preoperative range of motion.

In the current study, 27 consecutive total knee arthroplasties in 21 patients were assessed. All patients had a preoperative range of motion of less than 50 degrees, severe debilitation, and a minimum clinical and radiographic followup of 2 years (mean, 6 years; range, 2.3-11.8 years). The mean preoperative arc of motion was 30 degrees (range, 0 degrees -50 degrees) and improved to a mean 74 degrees (range, 15 degrees -110 degrees) postoperatively. Preoperative flexion contracture was corrected from a mean 28 degrees (range, 0 degrees -60 degrees) to a mean postoperative flexion contracture of 4.4 degrees (range, -5 degrees -30 degrees). In this series, the overall complication rate was 41% and the revision rate was 18.5%. The clinical significance of this study is that patients with stiff knees who are debilitated severely can have an improved quality of life after total knee arthroplasty, reflected by an increased walking tolerance, increased functional abilities, and decrease in pain, but in association with a high risk of complications and subsequent revisions.

Adult↗