A certain amount of valgus laxity of the thumb MCP joint is normal, typically 6[degrees] in extension and 12[degrees] in flexion.
To perform the test, one hand should stabilize the metacarpal neck while the other grasps the proximal phalanx and controls rotation, because rotation of the phalanx can masquerade as valgus laxity (Fig.
(10) Defining instability parameters more specifically, the traditional diagnosis of a complete UCL rupture is made if there is over 35[degrees] of valgus laxity in either flexion or extension and there is a greater than 15[degrees] difference compared to the uninjured thumb.
Moderate instability refers to valgus laxity
<10[degrees], and severe instability refers to valgus laxity
Valgus knee stress produced lateral knee pain without any valgus laxity
. No pain or laxity was present with varus stress, Lachmann's, posterior drawer or patellar apprehension tests.
Lesions that may require surgical intervention include chronic MCL injuries (more than 3 months' duration with high-grade valgus laxity
and knee instability) that have failed non-operative treatment, multiple-ligament knee injuries, large bony avulsions, tibial plateau fracture, intra-articular entrapment of the end of a ligament, or anteromedial instability (positive anterior drawer test) [6,16,17].
The range of motion is highly variable at the thumb metacarpophalangeal joint with regard to flexion-extension arcs and the degree of valgus laxity.
(10) The level of valgus stability was variable; however, valgus laxity averaged 12[degrees] with the native metacarpophalangeal joint in 15[degrees] of flexion.
(28) Valgus laxity signifying complete tear (both proper and accessory collateral ligaments) has been defined previously as greater than 30[degrees] of deviation or 15[degrees] greater than the normal extremity.
is manifested by an increased medial joint space opening, as compared to the contralateral side.
Dynamic ultrasound examination showed increased thickness and hypoechoic foci or calcifications in asymptomatic pitchers (5) as well as elbow valgus laxity
. (6) Both of these studies related changes in the UCL with increased pitching time.