ACL reconstruction: effect of bone dowel on tibial tunnel enlargement.
OBJECTIVE
To evaluate prospectively if the impaction of a bone dowel in the tibial tunnel prevents the tunnels from enlarging beyond their original diameter.


METHODS
Seventeen patients underwent arthroscopically assisted ACL reconstruction with hamstring autologous graft. All patients underwent CT of the knee on the day of surgery, at 3 months and 12 months post-op.


RESULTS
On the day of surgery, the median cross-sectional areas of the tunnels were 77.0 and 79.0mm(2), respectively at 15 mm and 20mm from the tip of the posterior wall of the tunnel. At 3 months, the median cross-sectional areas of the tunnels were 70.0 and 65.0mm(2), at 15 mm and 20mm. At 12 months post-op, the median cross-sectional areas of the tunnels were 69.0 and 69.0mm(2). The median enlargement of the tunnels between 3 months and 12 months post-op was 0.0mm(2) at 15 mm and -2.0mm(2) at 20mm.


CONCLUSIONS
The impaction of an autologous bone dowel in the tibial tunnel during hamstring ACL reconstruction keeps the tunnels from enlarging beyond their original diameter, and there is no further enlargement of the tunnels after 3 months post-op.
Hospital Militar D. Pedro V, Orthopedics Departament, Avenida da Boavista, 4050-113 Porto, Portugal. alcindocsilva@gmail.com
Alcindo
A
Silva
Ricardo
R
Sampaio
Elisabete
E
Pinto
D000328:Adult; D016118:Anterior Cruciate Ligament / Q000601:surgery; D000070598:Anterior Cruciate Ligament Injuries; D059549:Anterior Cruciate Ligament Reconstruction / Q000295:instrumentation* / Q000379:methods*; D001182:Arthroscopy; D001858:Bone Nails; D016025:Bone Transplantation / Q000379:methods*; D006801:Humans; D007718:Knee Injuries; D007719:Knee Joint; D008297:Male; D012421:Rupture; D013977:Tibia / Q000473:pathology* / Q000601:surgery; D055815:Young Adult