One male was rescued after he suffered a dislocated knee at the Old Harbour breakwater in Barry.
The RNLI's inshore lifeboat from Barry Dock was out on an exercise when it was diverted on Thursday evening.
On arrival, they found the casaulty standing on the beach rocks, unable to bear weight on his left leg. He had previously dislocated the same knee twice and despite not showing visable distress, he was in pain.
Coastguards from Barry arrived shortly afterwards to carry out an assessment.

With the tide coming in amid the rocky terrain, it was decided to take the casaulty by lifeboat to Whitmore Bay, where he was met by a paramedic and later reunited with his mum.
Bill Kitchen, lifeboat operations manager at RNLI Barry Dock, said: "This was a good example of working with our Coastguard colleagues to ensure the casualty was moved as safely and comfortably as possible."
"Thanks to the calm conditions and quick decision-making, we were able to get him to the care he needed without delay."
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It's been a busy Bank Holiday for emergency services in the Vale - one person was airlifted to hospital after suffering a suspected broken leg in a fall at Witches Point in Southerndown on Saturday evening.
Meanwhile, the RNLI at Penarth dealth with three separate incidents in just two days.
On Sunday afternoon, a 32ft boat, which lost propulsion near Penarth Head, ended up drifting to Sully Island amid a strong north-easterly wind and a falling tide. The vessel was later towed towards the nearest safe location at Barry Dock.
Later that evening, another disabled yacht with two people on board was towed to the Cardiff Bay Barrage.
And on Monday evening, a 28ft boat suffered a fouled propeller and was unable to make headway while sailing into the wind amid a falling tide. It was later eventually into Cardiff Bay and made safe.

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