with Dr Peter Larkins

Doc Larkins, footy's first and most respected media medico, gives his take on the injury lists of all 18 AFL clubs. He writes exclusively every week for AFL.com.au.

The Doc says: Petrenko will have further scans on his right shoulder after a heavy collision with Mumford. It's a real concern and he will need surgery if a significant instability injury is detected. Mackay was selected but was a late withdrawal with ongoing hip soreness. He is likely to be right this week. 

The Doc says: The Lions are coming off the bye so Rockliff and Polec are most likely to be fully tested. Maguire and Rich are also back in training and may be in the mix. Maguire has missed 10 weeks and lacks match preparation. 

The Doc says: Carrazzo should at last return and Warnock (knee) is right to push for a senior return. 

The Doc says: No new concerns this week. Goldsack should train this week and Elliot (late withdrawal) along with Dwyer (groin) should be available.

The Doc says: Dempsey may miss one more but Gumbleton is more likely to be put through full testing.

 The Doc says: Freo is coming off the bye so expect Silvagni (ankle) and Neale (ankle) to be available to return.

The Doc says: Both Johnson and Christensen will have concussion monitoring all week but the bye will almost certainly ensure they both return for the Cats' round 13 match. Caddy played VFL and should be available with Rivers also in the mix for senior selection. McIntosh probably needs more VFL time. Motlop will return after the bye. 

The Doc says: Dixon has aggravated his right ankle and will struggle all week, leaving him in doubt but I suspect he will be selected for the big clash against the Bombers. Hunt (hammy recovery) played in the reserves on the weekend but his form was patchy. 

The Doc says: Brogan did not pass a fitness test but is closer this week. Greene and Miles are outside chances only and Cornes continues to struggle with his chronic knee but is helping with coaching and the development of younger players.

The Doc says: Rioli (round five hammy recurrence) was always expected to miss six to eight weeks but the club is being more conservative this time. He has worked on his core strength and running technique in an effort to avert further injury after he returns, which could be in round 14. Whitecross (ACL rehab) is due for his VFL return. 

The Doc says: Dawes has a left ankle sprain and was subbed at half-time. He will get treatment over the bye weekend and should be OK for round 13. Viney is an outside chance after the bye as is Byrnes, who played in the VFL last weekend. 

The Doc says: The Kangaroos continue to have one of the smallest injury lists in the competition. McMahon has a right thumb injury and is sore but may play after the bye with strapping even, if a small crack is detected on x-ray. There are no other new injuries after yet another disappointing loss against Gold Coast on the weekend. Tarrant continues his slow progress but should be in contention after the bye. 

The Doc says: Port is coming off a week of rest so Lobbe and Renouf should be ready for full testing. Redden has an unstable right shoulder but it seems the club may not opt for surgery in the hope he will get through to the end of the season without further dislocation. 

The Doc says: The Tigers are coming off the bye. Conca is ready for a senior return after a VFL game two weeks ago. Petterd has not progressed as the Tigers had expected him to and has had a setback costing him another two to three weeks. Ellis will be considered an outside chance. 

The Doc says: Fisher (foot stress) missed on weekend but should be right for round 13 after the bye. Wright (back) and Hickey (foot) were late withdrawals but Saints have no new injuries heading into the bye week. Schneider's hamstring recovery should allow him into full training after the bye but he is more likely to return at VFL level. 

The Doc says: Mumford has a fractured zygoma (cheekbone) but has had corrective surgery and may return in four weeks. Reid is getting close but is still in a risk period and may be given until round 14. Lewis should be ready after the bye. Rohan (tibia fracture) is running to build fitness but is a long way off match readiness. 

The Doc says: Kennedy has been carrying a low-grade calf injury and missed last weekend after being a late withdrawal but he is likely to be OK for round 13 after the bye. Waters and Glass should also return but LeCras' arm fracture continues to be sore since surgery after round one. He may be tested and continue playing with protective guard. 

The Doc says: Had a week off and should have Cooney, Boyd and Stevens all fit for this week. Williams is still contemplating a decision on his unstable shoulder but is likely to have revision surgery in the coming week and will hopefully return in 2014.