FO OF A B727 MADE A HARD LNDG CAUSING 1 ROW OF PAX SEATS' OXYGEN MASKS TO DROP AND 1 PAX NECK INJURY.

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FO'S APCH AND LNDG IN LEX IN VMC. UTILIZED VASI-L FOR PRIMARY GUIDANCE; WITH ELECTRONIC GS AS BACKUP. THE VISUAL APCH WAS SLIGHTLY LOW ON ELECTRONIC GS AND VASI INDICATED 'RED OVER LIGHT PINK.' AIRSPD VARIED BTWN BUG +5 TO BUG; WITH TOUCHDOWN AT BUG SPD. TOUCHDOWN WAS APPROX 1000 FT DOWN 7002 FT RWY. RWY HAS +0.4% UP SLOPE. TOUCHDOWN WAS AT A HIGHER THAN AVERAGE RATE OF DSCNT; BUT NOT CONSIDERED TO BE 'HARD' BY ME. WHEN THE FO AND FIRST FLT ATTENDANT WERE SAYING GOOD-BYE TO THE PAX; THEY WERE MADE AWARE OF 2 ROWS OF MASKS WHICH HAD DROPPED. 1 PAX INFORMED THEM THAT SHE HAD SUSTAINED 'WHIPLASH' ON LNDG; ALLEGEDLY AS THE MASKS IN HER ROW DEPLOYED. UPON DEPLANING I WAS INFORMED OF THE 'WHIPLASH' AND ADVISED THAT THE PAX WAS BEING ASSISTED BY APPROPRIATE MEDICAL PERSONNEL. THE PAX SVC AGENT TOOK MY NAME AND SAID THE PROB WAS BEING HANDLED. MAINT CREW FROM CVG STOWED THE MASKS; AND PERFORMED A 'HARD LNDG' CHK ON THE ACFT; AND RETRIEVED THE FDRC TAPE. I DID NOT REQUEST A 'HARD LNDG' CHK BECAUSE I DID NOT CONSIDER IT TO HAVE BEEN A 'HARD LNDG.' COMPANY MAINT AND/OR OPS REQUESTED 'HARD LNDG' INSPECTION ON THE BASIS OF THE PAX ALLEGED 'WHIPLASH.' INSPECTION RESULTED IN 'OK FOR SVC' ON ACFT. SUBSEQUENTLY; ON OCT/SAT/97; DIFFERENT CREW; DIFFERENT CITY; CHIEF PLT (B727) INFORMED ME THAT MASKS AT THAT ROW DROPPED AGAIN. I LEARNED: SLIGHTLY LOW; ON BUG SPD; PWR OFF IN FLARE WITH NOSE HIGH EQUALS FIRM TOUCHDOWN. PAX CHKED BY HOSPITAL AND RELEASED; CURRENT CONDITION OF PAX IS UNKNOWN.