Kinematics of active knee extension after tear of the anterior cruciate ligament

Abstract

Three-dimensional movements of the knees in 13 patients with unilateral old tears of ACLs were studied during extension. Roentgen stereophotogrammetric methods were used to measure tibial movements in the injured and the intact knees. Reduced internal rotation and adduction were recorded at the end of extension on both sides. The injured knees displayed increased anterior and distal displacements of the tibial intercondylar eminence. Abnormal tibial displacements in our patients indicate that the absence of the ACL is not completely compensated for during active extension past 30 degrees; close to the extended position, the tibial movements tend to normalize.

Kinematics after tear in the anterior cruciate ligament: Dynamic bilateral radiostereometric studies in 11 patients

“…All subsequent examinations were related to this straight reference position. The latter position was chosen to facilitate comparisons with previous studies (Kärrholm et al 1988a,b, 1989, Jonsson et al 1989, Jonsson and Kärrholm 1994. Furthermore, we found it difcult to standardize the alignment of the knee to the laboratory coordinate system in the weightbearing position.…”

“…The insertion of skeletal landmarks, as in radiostereometric analysis (RSA), also permits the detailed delineation of small changes in the kinematics of the knee (Kär-rholm 1989). This method has been used with increasing frequency to study the kinematics of joint motion in vitro and in vivo (Kärrholm et al 1988a, b, 1989, Jonsson et al 1989, Fridén et al 1992, Jonsson et al 1993, Jonsson and Kärr holm 1994, Jorn et al 1997. However, none of these studies has included measurements of knee kinematics during continuous active extension and simultaneous weight bearing, since no appropriate method of examination has been available.…”

In vivo kinematics of total knee arthroplasty

“…Rotation and translation were presented as previously described. 12,14,16,19,[21][22][23] Thus, tibial translation was measured at the centre of the knee using the markers in the distal femur as reference. In the normal knees a point between the two tips of the tibial intercondylar eminence was used when measuring translation.…”

Comparison of tibial rotation in fixed and mobile bearing total knee arthroplasty using computer navigation

“…normal screw-home mechanism) [8,10,15,16]. Previous total knee arthroplasty (TKA) studies have been limited and have analysed small numbers of patients, often using nonweight-bearing conditions or only throughout a limited percentage of the entire flexion range [1,2,7,11,12,18,19]. It is assumed that different axial rotation magnitudes and patterns (i.e.…”