Complications and Management of Meniscus Repair

Introduction to Meniscus Repair Complications

The American College of Radiology recommends ruling out infection first by assessing for fever, erythema, warmth, purulent drainage, or systemic inflammatory response, though infection at 12 weeks with proper rehabilitation is less likely 1, 2
The localized swelling and protrusion at the anterior horn repair site, exacerbated by leg press and squatting at 12 weeks post-surgery, most likely represents incomplete healing with persistent mechanical instability of the repair, potentially complicated by a parameniscal cyst formation or partial repair failure 2

Fluid extrusion through incompletely healed meniscal tissue can create parameniscal cysts that present as localized swelling and protrusion, particularly when intra-articular pressure increases during loaded activities 3
These cysts are more common when meniscal tears have not achieved complete healing and allow synovial fluid to track into perimeniscal tissues 3

The British Journal of Sports Medicine emphasizes that knee effusion or increased pain/swelling after exercise indicates excessive loading and requires immediate modification 2
Stop leg press and squatting exercises immediately, as these activities generate excessive compressive and shear forces that are disrupting the healing repair 2
Apply compressive cryotherapy after all activities to reduce swelling, which is more effective than cryotherapy alone 2
Elevate the limb above heart level when resting to facilitate fluid drainage 2
Modify rehabilitation to focus on non-weight-bearing or minimal-load exercises until swelling resolves 2, 4
Regress to earlier phase exercises: return to isometric quadriceps exercises and gentle range of motion without resistance 2, 4
Progress only when no effusion develops: the knee must demonstrate no reactive swelling before advancing exercise intensity 2, 4
Continue rehabilitation for the full 9-12 months as recommended, recognizing that meniscal repairs require longer healing than isolated ACL reconstruction 2

The British Journal of Sports Medicine recommends advancing to closed kinetic chain exercises, such as partial squats in limited range, before open kinetic chain exercises, and delaying return to leg press until at least 16-20 weeks postoperatively if no reactive swelling occurs 5
The British Journal of Sports Medicine suggests starting with isometric quadriceps exercises if they provoke no pain or effusion, and progressing to concentric and eccentric exercises only when the knee does not react with effusion or increased pain 5