There's supposed to be hip damage, which scared away Seattle when they saw it. The Sox have worked out injury clauses in past contracts (JD Drew, Lackey, maybe others). They will walk away from a deal if they don't get something that either let's them drop the last year of the contract or get a year at MLB minimum if the preexisting condition leads to significant lost time. This is why they did not bring back Jason Bay. Mind you, if I'm Napoli, I get this stuff worked out within one week of the agreement in principle so I'm not left looking for a job in January with a questionable health tarnish.