Professional athletes may recover faster from certain types of injuries because of their superior fitness levels.
But leg fractures, as a rule of thumb, would take half a year to heal, said Dr Benedict Tan, chief and senior consultant of the Changi Sports Medicine Centre.
"Such injuries are often complex issues, since the ligament, tendon and cartilage may also be involved as well," said Dr Tan, who is also the senior consultant of Singapore Sports Medicine Centre.
Factors such as strength, agility and stability will be affected if other parts of the leg - other than the tibia and fibula - are injured as well, and need to be corrected through rehabilitation.
Damage to the cartilage will result in some form of permanent loss of the leg's full range of abilities, while damage to the tendons and ligaments may continue to impair a person after recovery as well, depending on the extent of the injury.
"Professional athletes already start at a higher level of fitness than the layman, so they will have an advantage in certain aspects of the rehabilitation process, such as strengthening work," said Dr Tan, who has not assessed footballer Shahdan Sulaiman's injuries himself.
"But there's no such advantage when it comes to broken bones; you have to give it time for them to fuse.
"At the same time, he should need to beware of deconditioning and joint stiffness, especially when a cast is involved."
The former national sailor, who is now the Singapore Sailing Federation president, added that the timeline for a person's comeback from such injuries also depends on whether doctors can restore the injured parts to their original condition during surgery.
"Six months is a rule of thumb for such injuries; some may gamble after five months, but it depends on how quickly or slowly the injuries heal," said Dr Tan.
"But it will be about six months before one can run and jump after such injuries, and longer if he wants to play football.
He was in excruciating pain, and saw the lower part of his right leg twisted in an awkward angle.
Singapore international midfielder Shahdan Sulaiman instinctively tried to put it back into position.
This happened after he collided with teammate Khairul Amri while defending a corner against Myanmar in the Lions' 4-2 win at the National Stadium on Wednesday.
"I couldn't believe that my foot was in such an awkward position and I felt pain immediately," the 26-year-old told The New Paper in a telephone interview from his hospital bed yesterday.
"It was badly bent, but somehow I managed to force it back into position just before Fizah (Nurhafizah Abu Sujad, the team physiotherapist) reached me.
"I don't know where I got the courage to do that. This is definitely the worst injury in my career so far."
The 25th-minute incident in the ASEAN Football Federation Suzuki Cup match stunned teammates such as Amri, Sahil Suhaimi and Baihakki Khaizan, who were horrified by the extent of their teammate's injury.
Shahdan, who won the Great Eastern-Yeo's S.League title with Tampines Rovers last year, said: "(After the collision,) I could tell from the corner of my eye that Amri was trying to hurry the medical staff, and he gave me a call afterwards as well."
His wife of two years, Ms Suzielya Jamil, 26, was in the stands but did not see the incident.
She said: "I was sitting with the wives of the other players but I was tending to my son when the incident happened.
"So I didn't know what happened until the other wives told me about it. I couldn't think straight after I found out."
Replaced by Zulfahmi Arifin, Shahdan was stretchered off after receiving treatment and immediately sent to Raffles Hospital with a fractured fibula and dislocation of the ankle.
He was warded overnight for observation and underwent successful surgery yesterday morning to fix his tibia and fibula, the Football Association of Singapore said.
"The doctors told me that I will be out for six months.
"They will take out the screws in my legs after six weeks, and then I'll be able to walk and start my rehabilitation," said Shahdan, whose discomfort and pain caused him to have a poor appetite and not sleep well yesterday.