I've been running for three years now and happily run around 20-30k a week. I've raced in races up to half marathon distance but in the three times I've tried to train for a marathon I've injured myself and had to sit it out (Dublin this time). The pain is always on the inner (medial) part of the knee which ends up as swelling when I've pushed it too far - 18 miles this time. I've done rounds of doctors, masseurs and physios and the common feeling is weak adductors and glutes although I've been building them up this year. I'm starting a more intense plan once I recover this time but I wondered has anyone similar experience with medial knee injuries and have any words of wisdom?