Isometric placement of lateral ulnar collateral ligament reconstructions: a biomechanical study.
BACKGROUND
Lateral ulnar collateral ligament (LUCL) reconstruction using a tendon graft is a well-accepted procedure used in the treatment of posterolateral rotatory instability. However, unlike most other ligament reconstructions, anatomical guidelines for the isometric points for tunnel placement of LUCL reconstruction have not been defined.


OBJECTIVE
To determine if isometric points exist for tunnel placement for LUCL reconstruction and, if so, to determine their anatomical guidelines.


METHODS
Controlled laboratory study.


METHODS
A series of 1.8-mm drill holes was placed in potential ligament reconstruction origin and insertion sites in 13 normal cadaveric elbows along the supinator crest of the ulna and in the lateral epicondyle of the humerus. The prepared specimens were mounted in a plastic test frame with electromagnetic sensors inserted into the drill holes. The distance between each potential pair of insertion sites was measured throughout the arc of elbow motion to determine the most isometric combinations of humeral and ulnar insertion sites.


RESULTS
We could not locate truly isometric points for tunnel placement for LUCL reconstruction. For LUCL reconstruction, the position of most isometric tunnel placement was on the supinator crest 16 to 20 mm distal to the proximal margin of the radial head for the proximal wall of the ulnar tunnel, and between the 3:00 and 4:30 o'clock positions on the lateral epicondyle for the posterior/distal wall of the humeral tunnel.


CONCLUSIONS
Similar to the native LUCL, there is no truly isometric location for LUCL tendon graft reconstruction tunnels. Also similar to the native LUCL, the distance between the optimal tunnel position decreases in elbow extension and often increases in elbow flexion.


CONCLUSIONS
The most isometric position for LUCL reconstruction tunnel placement was defined using anatomical references.
Baylor College of Medicine, University of Texas, Houston, Texas, USA.
David
D
Goren
Jeffrey E
JE
Budoff
John A
JA
Hipp
D000368:Aged; D000704:Analysis of Variance; D001696:Biomechanical Phenomena; D002102:Cadaver; D017885:Collateral Ligaments / Q000293:injuries / Q000601:surgery*; D004550:Elbow / Q000601:surgery; D004551:Elbow Joint / Q000601:surgery; D006801:Humans; D006811:Humerus / Q000601:surgery; D007537:Isometric Contraction; D008023:Ligaments, Articular / Q000601:surgery*; D019651:Plastic Surgery Procedures / Q000379:methods*; D014457:Ulna / Q000601:surgery*