Abstract
Fisheye STUDY DESIGN: Case report. Fisheye BACKGROUND: Decreased quadriceps activation has been shown to be present following anterior cruciate ligament (ACL) injury, but its presence prior to ACL injury is unknown. The purpose of this case report was to describe the level of quadriceps activation measured hours before a noncontact ACL injury in an individual who previously demonstrated known biomechanical risk factors for ACL injury. Fisheye CASE DESCRIPTION: A 23-year-old female (height, 176.9 cm; mass, 72.4 kg), sustained a left noncontact ACL injury while landing from a jump stop during a recreational basketball game. This case was unique because data regarding landing biomechanics and quadriceps force and activation were gathered in 2 separate, unrelated studies prior to injury. Fisheye OUTCOMES: Peak external knee abduction moment (-65.3 Nm) during a drop jump landing 8 months prior to injury indicated elevated risk for ACL injury. Involved quadriceps central activation ratios (CAR) were obtained 1 week (CAR, 0.81) and 4 hours (CAR, 0.77) prior to injury. Strength and CAR (0.76) measurements changed very little within 36 hours of injury and both strength, and activation (CAR, 0.90) improved following surgical reconstruction and formal rehabilitation. Fisheye DISCUSSION: An individual with known biomechanical risk factors for ACL injury may compound risk for noncontact ACL injury if decreased quadriceps activation is also present. Fisheye LEVEL OF EVIDENCE: Prognosis, level 4.
| Original language | English |
|---|---|
| Pages (from-to) | 502-507 |
| Number of pages | 6 |
| Journal | Journal of Orthopaedic and Sports Physical Therapy |
| Volume | 38 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 2008 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Health Professions(all)
- Physical Therapy, Sports Therapy and Rehabilitation
Cite this
Decreased quadriceps activation measured hours prior to a noncontact anterior cruciate ligament tear. / Grindstaff, Terry L.; Jackson, Kate R.; Garrison, J. Craig; Diduch, David R.; Ingersoll, Christopher D.
In: Journal of Orthopaedic and Sports Physical Therapy, Vol. 38, No. 8, 08.2008, p. 502-507.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Decreased quadriceps activation measured hours prior to a noncontact anterior cruciate ligament tear
AU - Grindstaff, Terry L.
AU - Jackson, Kate R.
AU - Garrison, J. Craig
AU - Diduch, David R.
AU - Ingersoll, Christopher D.
PY - 2008/8
Y1 - 2008/8
N2 - Fisheye STUDY DESIGN: Case report. Fisheye BACKGROUND: Decreased quadriceps activation has been shown to be present following anterior cruciate ligament (ACL) injury, but its presence prior to ACL injury is unknown. The purpose of this case report was to describe the level of quadriceps activation measured hours before a noncontact ACL injury in an individual who previously demonstrated known biomechanical risk factors for ACL injury. Fisheye CASE DESCRIPTION: A 23-year-old female (height, 176.9 cm; mass, 72.4 kg), sustained a left noncontact ACL injury while landing from a jump stop during a recreational basketball game. This case was unique because data regarding landing biomechanics and quadriceps force and activation were gathered in 2 separate, unrelated studies prior to injury. Fisheye OUTCOMES: Peak external knee abduction moment (-65.3 Nm) during a drop jump landing 8 months prior to injury indicated elevated risk for ACL injury. Involved quadriceps central activation ratios (CAR) were obtained 1 week (CAR, 0.81) and 4 hours (CAR, 0.77) prior to injury. Strength and CAR (0.76) measurements changed very little within 36 hours of injury and both strength, and activation (CAR, 0.90) improved following surgical reconstruction and formal rehabilitation. Fisheye DISCUSSION: An individual with known biomechanical risk factors for ACL injury may compound risk for noncontact ACL injury if decreased quadriceps activation is also present. Fisheye LEVEL OF EVIDENCE: Prognosis, level 4.
AB - Fisheye STUDY DESIGN: Case report. Fisheye BACKGROUND: Decreased quadriceps activation has been shown to be present following anterior cruciate ligament (ACL) injury, but its presence prior to ACL injury is unknown. The purpose of this case report was to describe the level of quadriceps activation measured hours before a noncontact ACL injury in an individual who previously demonstrated known biomechanical risk factors for ACL injury. Fisheye CASE DESCRIPTION: A 23-year-old female (height, 176.9 cm; mass, 72.4 kg), sustained a left noncontact ACL injury while landing from a jump stop during a recreational basketball game. This case was unique because data regarding landing biomechanics and quadriceps force and activation were gathered in 2 separate, unrelated studies prior to injury. Fisheye OUTCOMES: Peak external knee abduction moment (-65.3 Nm) during a drop jump landing 8 months prior to injury indicated elevated risk for ACL injury. Involved quadriceps central activation ratios (CAR) were obtained 1 week (CAR, 0.81) and 4 hours (CAR, 0.77) prior to injury. Strength and CAR (0.76) measurements changed very little within 36 hours of injury and both strength, and activation (CAR, 0.90) improved following surgical reconstruction and formal rehabilitation. Fisheye DISCUSSION: An individual with known biomechanical risk factors for ACL injury may compound risk for noncontact ACL injury if decreased quadriceps activation is also present. Fisheye LEVEL OF EVIDENCE: Prognosis, level 4.
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U2 - 10.2519/jospt.2008.2761
DO - 10.2519/jospt.2008.2761
M3 - Article
VL - 38
SP - 502
EP - 507
JO - Journal of Orthopaedic and Sports Physical Therapy
JF - Journal of Orthopaedic and Sports Physical Therapy
SN - 0190-6011
IS - 8
ER -