Abstract
Background. Understanding the normal kinematics of the joints is important for reconstructive surgery. However, only a few extensive studies have been done on medial and lateral laxity of the normal knee. Methods. Radiographs of 50 normal knees were obtained under varus and valgus stress in both extension and flexion and the relative angle of the articular surface was measured. Results. In extension, the mean angle was 4.9° in varus stress and 2.4° in valgus stress. In flexion, the mean angle was 4.8° in varus stress and 1.7° in valgus stress. Lateral laxity was significantly greater than medial laxity in both extension and flexion. Conclusions. Lateral laxity may be necessary for the medial pivot movement of the normal knee. There is some disagreement regarding the importance of pursuing the perfect rectangular gaps during total knee arthroplasty (TKA). The methods for measuring the tension of soft tissues during the operation are not accurate and do not always reflect the postoperative tensions of dynamic phases, such as walking and standing. Slight lateral laxity can be accepted with TKA, and further studies are necessary to determine whether prosthesis lift-off occurs in the replaced knee with slight lateral laxity similar to that in the normal knee.
| Original language | English |
|---|---|
| Pages (from-to) | 264-266 |
| Number of pages | 3 |
| Journal | Journal of Orthopaedic Science |
| Volume | 11 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - May 2006 |
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All Science Journal Classification (ASJC) codes
- Surgery
- Orthopedics and Sports Medicine
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Asymmetry of mediolateral laxity of the normal knee. / Okazaki, Ken; Miura, Hiromasa; Matsuda, Shuichi; Takeuchi, Naohide; Mawatari, Taro; Hashizume, Makoto; Iwamoto, Yukihide.
In: Journal of Orthopaedic Science, Vol. 11, No. 3, 05.2006, p. 264-266.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Asymmetry of mediolateral laxity of the normal knee
AU - Okazaki, Ken
AU - Miura, Hiromasa
AU - Matsuda, Shuichi
AU - Takeuchi, Naohide
AU - Mawatari, Taro
AU - Hashizume, Makoto
AU - Iwamoto, Yukihide
PY - 2006/5
Y1 - 2006/5
N2 - Background. Understanding the normal kinematics of the joints is important for reconstructive surgery. However, only a few extensive studies have been done on medial and lateral laxity of the normal knee. Methods. Radiographs of 50 normal knees were obtained under varus and valgus stress in both extension and flexion and the relative angle of the articular surface was measured. Results. In extension, the mean angle was 4.9° in varus stress and 2.4° in valgus stress. In flexion, the mean angle was 4.8° in varus stress and 1.7° in valgus stress. Lateral laxity was significantly greater than medial laxity in both extension and flexion. Conclusions. Lateral laxity may be necessary for the medial pivot movement of the normal knee. There is some disagreement regarding the importance of pursuing the perfect rectangular gaps during total knee arthroplasty (TKA). The methods for measuring the tension of soft tissues during the operation are not accurate and do not always reflect the postoperative tensions of dynamic phases, such as walking and standing. Slight lateral laxity can be accepted with TKA, and further studies are necessary to determine whether prosthesis lift-off occurs in the replaced knee with slight lateral laxity similar to that in the normal knee.
AB - Background. Understanding the normal kinematics of the joints is important for reconstructive surgery. However, only a few extensive studies have been done on medial and lateral laxity of the normal knee. Methods. Radiographs of 50 normal knees were obtained under varus and valgus stress in both extension and flexion and the relative angle of the articular surface was measured. Results. In extension, the mean angle was 4.9° in varus stress and 2.4° in valgus stress. In flexion, the mean angle was 4.8° in varus stress and 1.7° in valgus stress. Lateral laxity was significantly greater than medial laxity in both extension and flexion. Conclusions. Lateral laxity may be necessary for the medial pivot movement of the normal knee. There is some disagreement regarding the importance of pursuing the perfect rectangular gaps during total knee arthroplasty (TKA). The methods for measuring the tension of soft tissues during the operation are not accurate and do not always reflect the postoperative tensions of dynamic phases, such as walking and standing. Slight lateral laxity can be accepted with TKA, and further studies are necessary to determine whether prosthesis lift-off occurs in the replaced knee with slight lateral laxity similar to that in the normal knee.
UR - http://www.scopus.com/inward/record.url?scp=33744489043&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33744489043&partnerID=8YFLogxK
U2 - 10.1007/s00776-006-1009-x
DO - 10.1007/s00776-006-1009-x
M3 - Article
C2 - 16721527
AN - SCOPUS:33744489043
VL - 11
SP - 264
EP - 266
JO - Journal of Orthopaedic Science
JF - Journal of Orthopaedic Science
SN - 0949-2658
IS - 3
ER -