<unk> s can often be diagnosed clinically based on the patient's signs and symptoms, mechanism of injury, and physical examination. However, x-rays can be obtained to help identify fractures, especially in cases of tenderness or bone pain at the injured site. In some instances, particularly if the healing process is prolonged or a more serious injury is suspected, magnetic resonance imaging (MRI) is performed to look at the surrounding soft tissue and ligaments. Classification #First degree<unk>  (mild) – There is minor stretching and structural damage to the ligament, leading to mild swelling and bruising. Patients typically present without joint instability or decreased range of motion of the joint. #Second degree<unk>  (moderate) – There is a partial tear of the affected ligament. Patients typically experience moderate swelling, tenderness, and some instability of the joint. There may be some difficulty bearing weight on the affected joint. #Third degree<unk>  (severe) – There is a complete rupture or tear of the ligament, sometimes avulsing a piece of bone. Patients typically experience severe joint instability, pain, bruising, swelling, and inability to apply weight to the joint. Three-dimensional animation illustrating a<unk>  Joints involved Although any joint can experience a<unk> , some of the more common injuries include the following: *Ankle -<unk> s most commonly occur at the ankle and can take longer to heal than ankle bone fractures. Most<unk> ed ankles usually occur in the lateral ligaments on the outside of the ankle. Common causes include walking on uneven surfaces or during contact sports. See<unk> ed ankle or high ankle<unk>  for more details. *Inversion Ankle<unk>  - injury that occurs when ankle rolls inward *Eversion Ankle<unk>  - injury that occurs when ankle rolls outward *Toes *Turf toe (metatarsophalangeal joint<unk>  - forced hyperextension of the big toe upwards, especially during sports (initiating a<unk> t on a hard surface) *Knee -<unk> s commonly occur at the knee, especially following intense pivoting on a planted leg during contact sports (American football, football, basketball, pole vaulting, softball, baseball and some styles of martial arts). *Anterior cruciate ligament (ACL) injury *Posterior cruciate ligament (PCL) injury *Medial collateral ligament (MCL) injury *Lateral collateral ligament (LCL) injury *Superior Tibiofibular Joint<unk>  - typically caused by a twisting injury to the joint connecting the tibia (shinbone) and fibula *Patellar dislocation *Fingers and wrists - Wrist<unk> s commonly occur, especially during a fall on an outstretched hand. *Gamekeeper's thumb (Skier's thumb) - forceful grabbing that leads to an injury to the ulnar collateral ligament (UCL) at the metacarpophalangeal (MCP) joint of the thumb, historically found in Scottish gamekeepers *Spine *Neck<unk>  at the cervical vertebrae *Whiplash (Traumatic Cervical Spine Syndrome) - forced hyperextension and flexion of the neck, classically found in rear-end auto accidents *Back<unk>  - Back<unk> s are one of the most common medical complaints, often caused by poor lifting mechanics and weak core muscles.
Sprain
Bone fracture
Back injury
Strain (injury)
Back strain
Swayback
Whiplash 
Whiplash