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Knee biomechanics after UKA and its relation to the ACL--a robotic investigation.
J Orthop Res. 2006 Apr; 24(4):588-94.JO

Abstract

Unicompartmental knee arthroplasty (UKA) has regained popularity in recent years. However, limited data exist on how UKA affects knee biomechanics. The role of the anterior cruciate ligament (ACL) after fixed bearing UKA remains controversial. In this study, a robotic testing system was used to apply a quadriceps/hamstrings load to cadaveric knee specimens in the intact state, after medial UKA, and after transection of the ACL in UKA. The load was applied to the knee from full extension to 120 degrees of flexion in 30 degrees increments. UKA generally did not affect anterior-posterior (AP) femoral position, but did cause external tibial rotation and variations in varus-valgus rotation compared to the intact knee. ACL transection after UKA shifted the femur posteriorly compared to the intact and UKA knees and increased internal tibial rotation compared to the UKA knee at low flexion. The AP motion of the articular contact position in the implant was increased after ACL transection. These data might help explain the mechanism of tibial component loosening and provide insight into further investigations of polyethylene wear in UKA. Based on the kinematic data, the ACL should be functional to provide patients the greatest opportunity for long-term success after medial UKA.

Authors+Show Affiliations

Suggs JF
Bioengineering Laboratory, Department of Orthopaedic Surgery, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, GRJ 1215, Boston, Massachusetts 02114, USA.
Li G
No affiliation info available
Park SE
No affiliation info available
Sultan PG
No affiliation info available
Rubash HE
No affiliation info available
Freiberg AA
No affiliation info available

MeSH

AgedAnterior Cruciate LigamentArthroplasty, Replacement, KneeBiomechanical PhenomenaHumansKnee JointRoboticsRotationTibia

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

16514655

Citation

Suggs, Jeremy F., et al. "Knee Biomechanics After UKA and Its Relation to the ACL--a Robotic Investigation." Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society, vol. 24, no. 4, 2006, pp. 588-94.
Suggs JF, Li G, Park SE, et al. Knee biomechanics after UKA and its relation to the ACL--a robotic investigation. J Orthop Res. 2006;24(4):588-94.
Suggs, J. F., Li, G., Park, S. E., Sultan, P. G., Rubash, H. E., & Freiberg, A. A. (2006). Knee biomechanics after UKA and its relation to the ACL--a robotic investigation. Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society, 24(4), 588-94.
Suggs JF, et al. Knee Biomechanics After UKA and Its Relation to the ACL--a Robotic Investigation. J Orthop Res. 2006;24(4):588-94. PubMed PMID: 16514655.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Knee biomechanics after UKA and its relation to the ACL--a robotic investigation. AU - Suggs,Jeremy F, AU - Li,Guoan, AU - Park,Sang Eun, AU - Sultan,Peter G, AU - Rubash,Harry E, AU - Freiberg,Andrew A, PY - 2006/3/4/pubmed PY - 2006/5/5/medline PY - 2006/3/4/entrez SP - 588 EP - 94 JF - Journal of orthopaedic research : official publication of the Orthopaedic Research Society JO - J Orthop Res VL - 24 IS - 4 N2 - Unicompartmental knee arthroplasty (UKA) has regained popularity in recent years. However, limited data exist on how UKA affects knee biomechanics. The role of the anterior cruciate ligament (ACL) after fixed bearing UKA remains controversial. In this study, a robotic testing system was used to apply a quadriceps/hamstrings load to cadaveric knee specimens in the intact state, after medial UKA, and after transection of the ACL in UKA. The load was applied to the knee from full extension to 120 degrees of flexion in 30 degrees increments. UKA generally did not affect anterior-posterior (AP) femoral position, but did cause external tibial rotation and variations in varus-valgus rotation compared to the intact knee. ACL transection after UKA shifted the femur posteriorly compared to the intact and UKA knees and increased internal tibial rotation compared to the UKA knee at low flexion. The AP motion of the articular contact position in the implant was increased after ACL transection. These data might help explain the mechanism of tibial component loosening and provide insight into further investigations of polyethylene wear in UKA. Based on the kinematic data, the ACL should be functional to provide patients the greatest opportunity for long-term success after medial UKA. SN - 0736-0266 UR - https://www.unboundmedicine.com/medline/citation/16514655/Knee_biomechanics_after_UKA_and_its_relation_to_the_ACL__a_robotic_investigation_ DB - PRIME DP - Unbound Medicine ER -