JOURNAL ARTICLE

A biomechanical evaluation of femoroplasty under simulated fall conditions

Edward G Sutter, Simon C Mears, Stephen M Belkoff
Journal of Orthopaedic Trauma 2010, 24 (2): 95-9
20101133

OBJECTIVES: To test the hypotheses that, compared with controls: 1) femoroplasty (the injection of bone cement into the proximal femur in an attempt to prevent fragility fracture) increases the yield and ultimate loads, yield and ultimate energies, and stiffness of the proximal osteoporotic femur in a simulated fall model; and 2) the manner in which the cement distributes in the proximal femur affects the extent to which those mechanical properties are altered.

METHODS: In 10 pairs of osteoporotic human cadaveric femora, we injected one femur of each pair with 40 to 50 mL of polymethylmethacrylate bone cement; the noninjected femur served as the control. The filling percentage was calculated in four anatomic regions of the femur: head, neck, trochanter, and subtrochanter. All specimens were biomechanically tested in a configuration that simulated a fall on the greater trochanter. Student t test, linear regression, and multinomial logistic regression statistical analyses were conducted where appropriate with significant difference defined as P < 0.05.

RESULTS: Femoroplasty significantly increased yield load (22.0%), ultimate load (37.3%), yield energy (79.6%), and ultimate energy (154%) relative to matched controls but did not significantly change stiffness (-10.9%). There was a strong (r = 0.7) correlation between yield load and filling percentage in the femoral neck.

CONCLUSIONS: This study showed that 1) femoroplasty significantly increased fracture load and energy to fracture when osteoporotic femora were loaded in simulated fall conditions, and 2) cement filling in the femoral neck may have an important role in the extent to which femoroplasty affects mechanical strength of the proximal femur.

Full Text Links

Find Full Text Links for this Article

Discussion

You are not logged in. Sign Up or Log In to join the discussion.

Related Papers

Remove bar
Read by QxMD icon Read
20101133
×

Save your favorite articles in one place with a free QxMD account.

×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"