Knee Conditions
Explore orthopedic conditions affecting the knee — from common injuries to specialized conditions.
ACL Tear
Ligament tear in the center of the knee, common in pivoting sports.
CommonAseptic Implant Loosening
Joint replacement implant loosening from bone over time, causing new pain.
Baker's Cyst (Popliteal Cyst)
Fluid-filled cyst behind the knee from excess joint fluid, linked to arthritis.
CommonBucket-Handle Meniscal Tear
Large meniscus tear that folds into the joint, locking the knee bent.
Chondral (Articular Cartilage) Defects
Damaged knee joint surface cartilage causing pain, swelling, and catching.
ITB Syndrome (Iliotibial Band Syndrome)
Outer knee band inflammation from overuse, common in runners and cyclists.
CommonInstability After Total Knee Arthroplasty
Knee replacement giving way or feeling loose from ligament or implant issues.
Knee Osteoarthritis
Knee cartilage wear causing pain, swelling, and stiffness, common after age 50.
CommonMCL / LCL Sprain & Tear
Side knee ligament sprain or tear from a blow or twisting injury.
CommonMeniscal Root Tear
Tear at the meniscus attachment to the shin bone, reducing knee cushioning.
Meniscus Tear
Torn knee cartilage from a twist or wear, causing pain and locking.
CommonOsgood-Schlatter Disease
Growth plate irritation below the kneecap in active adolescents from sports.
CommonOsteochondritis Dissecans (OCD) of the Knee
Knee bone and cartilage losing blood supply, common in active adolescents.
Osteonecrosis of the Knee
Knee bone losing blood supply and collapsing, often seen in older women.
PCL Tear
Posterior knee ligament tear, usually from a direct blow to the knee.
Patellar Fracture
Broken kneecap from a direct fall or blow onto the knee.
Patellar Instability / Dislocation
Kneecap slipping out of place, more common in teenagers and young women.
CommonPatellar Tendinitis (Jumper's Knee)
Overuse tendon inflammation below the kneecap, common in jumping athletes.
CommonPatellar Tendon Rupture
Complete kneecap tendon tear causing sudden inability to straighten the leg.
Periprosthetic Fracture
Bone fracture near a joint replacement implant, usually after a fall.
Periprosthetic Joint Infection (PJI)
Bacterial infection around a joint implant after replacement surgery.
Pes Anserine Bursitis
Inner knee bursa inflammation below the joint, common with osteoarthritis.
CommonPost-Traumatic Knee Arthritis
Knee arthritis developing years after a fracture, ACL, or meniscus injury.
Quadriceps Tendon Rupture
Torn thigh tendon above the kneecap causing inability to straighten the knee.
Revision Total Joint Arthroplasty
Surgery to repair a failed joint replacement due to loosening or wear.
Rheumatoid Arthritis — Knee
Autoimmune joint inflammation causing chronic knee swelling, often in both knees.
Total Knee Replacement
Surgery replacing a severely arthritic knee with an implant to relieve pain.
CommonUnicompartmental Knee Arthritis / Partial Knee Replacement
Arthritis on one side of the knee in an otherwise healthy joint.
Varus / Valgus Knee Deformity with Arthritis
Severe knee arthritis causing the leg to bow inward or outward.